Free tools

P6 XER → Excel Converter

Drop a Primavera P6 .xer export and get a clean workbook — Activities, Relationships, WBS, a P6-style banded view. Runs in your browser, work shown.

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Schedule Health Check (DCMA 14-point)

DCMA 14-point assessment on an XER — every check, threshold, pass/fail, and the activities to fix. Runs in your browser, work shown.

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Schedule Comparison (XER diff)

Previous vs current XER — added, deleted, changed and renumbered or split activities, logic, finish slips ranked, critical-path changes, and the change log written for you. Runs in your browser, work shown.

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Look-Ahead Schedule (from an XER)

2- to 8-week look-ahead from the data date, by week and area, with what each activity is waiting on. Runs in your browser, work shown.

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Labor Histogram (from an XER)

Remaining or planned hours by week and resource, the peak, FTEs, the cumulative curve, unassigned activities. Runs in your browser, work shown.

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XER Viewer (P6 schedule Gantt)

Open a P6 XER as a Gantt without P6 — filter by WBS, activity codes, float and dates, critical work marked, share the view as a link, print. Runs in your browser, work shown.

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Voltage Drop Calculator

Resistance or impedance method (Table 8 K, or Table 9 with power factor); size, drop, or max length. Runs in your browser, work shown.

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Ampacity and Derating Calculator

Table 310.16 with ambient, conductor count, and termination limits. Runs in your browser, work shown.

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Wire Sizing Calculator

Minimum conductor for a load: ampacity, terminations, continuous load, and voltage drop. Runs in your browser, work shown.

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Transformer Calculator

Full-load currents, Table 450.3(B) protection, and kVA for a load. Runs in your browser, work shown.

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Grounding Conductor Sizing Calculator

Table 250.122 EGC by device, 250.122(B) upsizing, Table 250.66 GEC by service conductors. Runs in your browser, work shown.

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Motor Circuit Calculator (Article 430)

Table FLC, 125 % conductors, 430.52 device by type with Exception 1, nameplate overloads, disconnect, EGC; feeders for several motors. Runs in your browser, work shown.

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Available Fault Current Calculator

Transformer kVA and %Z, utility contribution, conductor runs on Table 9 impedances, motor contribution — kA at each point. Runs in your browser, work shown.

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Service and Feeder Sizing Calculator

From a calculated load to conductors, device, grounding electrode conductor or EGC, and bonding jumper in one pass — with the 310.12 dwelling rule. Runs in your browser, work shown.

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Residential Load Calculator (NEC Article 220)

Standard and optional methods side by side, existing-dwelling check, EVSE, neutral, service size — line by line with the section. Runs in your browser, work shown.

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Commercial Load Calculator (NEC Article 220)

Lighting by occupancy with demand factors, receptacles, signs and show windows, kitchen, motors, HVAC — calculated load, continuous portion, neutral, service size. Runs in your browser, work shown.

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Multifamily Load Calculator (NEC 220.84)

Part III and the 220.84 optional method side by side for N identical units, the 8 kW cooking exception, the 220.85 duplex rule, three-phase range and dryer counting, house loads, neutral, service size. Runs in your browser, work shown.

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Optional Load Calculations — Schools, New Restaurants, Existing Loads (NEC 220.86, 220.88, 220.87)

Table 220.86 by VA per square foot, Table 220.88 all-electric or not, and 125 % of measured demand plus the new load against the existing rating. Runs in your browser, work shown.

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EV Charger Circuit Calculator — NEC 625 Breaker, Wire, EGC, Service Load

The 125 % continuous rule for the device and conductors, the EGC, charge-time, and the 220.57 service load — with the EVEMS allowance. Runs in your browser, work shown.

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PV String Sizing Calculator — NEC 690.7 Maximum Voltage, 690.8 Currents, 690.9 OCPD

Maximum string voltage from the module's coefficient at the site's record low, 125 % currents, conductor by the larger of the two 690.8(B) rules, device by 690.9. Runs in your browser, work shown.

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HVAC MCA and MOCP Calculator — NEC 440 Motor-Compressor Circuits

Minimum circuit ampacity and maximum overcurrent protection from the compressors, fans, and heat — then the wire and EGC. Runs in your browser, work shown.

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Transformer Inrush Calculator — Will the Primary Breaker Hold on Energization?

First-half-cycle inrush from the multiple you enter against the breaker's instantaneous trip or the fuse's melt curve, with the 450.3(B) context. Runs in your browser, work shown.

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Data Center Power and Cooling Calculator — IT kW to UPS, Feeders, Tons, CFM, GPM, PUE

IT load → UPS kVA and input → feeder amps and devices → heat, tons, cooling units with N+1 → CFM and chilled-water GPM → facility power at the PUE. Runs in your browser, work shown.

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VFD Circuit Calculator — NEC 430.122 Drive Input Conductors, Motor Conductors, Device, EGC

Conductors at 125 % of the drive's rated input current (430.122), motor conductors per 430.22, device by the drive's listing and 430.52, EGC. Runs in your browser, work shown.

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Lighting Calculator — Lumen Method Fixture Count, Watts per Square Foot, Circuits

Fixtures from footcandles, lumens, CU, and light loss factor; room cavity ratio; watts and W/ft²; circuits at the continuous-load rating (80 % of a 15 A or 20 A breaker). Runs in your browser, work shown.

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Busway Load and Voltage Drop Calculator — Plug-In Taps, Manufacturer Impedance, NEC 368

Loading at the feed against the rating and the voltage drop tap by tap from the manufacturer's R and X per 1000 ft. Runs in your browser, work shown.

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Conduit Bend Total Calculator

Sum the bends between pull points against 360° or a 270° spec. Runs in your browser, work shown.

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Conduit Fill Calculator

Chapter 9 Tables 1, 4, 5 — check a size, find the smallest, or count what fits. Runs in your browser, work shown.

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Box Fill Calculator

314.16 volume count — conductors, devices, clamps, studs, grounds. Runs in your browser, work shown.

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Cable Tray Fill Calculator

392.22 — multiconductor cables or single conductors in ladder and ventilated tray. Runs in your browser, work shown.

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Conduit Bending Calculator

Offsets, saddles, 90° stubs, segmented bends, kicks, gain — marks to the sixteenth. Runs in your browser, work shown.

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Cable Pulling Calculator

Pulling tension and sidewall pressure through the run — both directions. Runs in your browser, work shown.

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Pull Box Sizing Calculator

314.28 — straight, angle, and U pulls from the raceway trade sizes. Runs in your browser, work shown.

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Ohm's Law Calculator

Any two of volts, amps, ohms, watts → all four. Runs in your browser, work shown.

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Power Calculator

Watts, volts, amps, and power factor — single- or three-phase. Runs in your browser, work shown.

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Power Triangle Calculator

kW, kVA, kVAR, and power factor from any two. Runs in your browser, work shown.

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Power Factor Correction Calculator

Capacitor kVAR to reach a target power factor. Runs in your browser, work shown.

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Conductor Size Converter

AWG and kcmil to circular mils, mm² and diameter. Runs in your browser, work shown.

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Harmonic K-Factor Transformer Calculator

Harmonic loads by type or measured spectrum → K-factor, THDi, the K-rated transformer, and the neutral warning. Runs in your browser, work shown.

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UPS Battery Sizing Calculator

Load, runtime, DC bus, chemistry, aging and temperature factors → Ah, end voltage, discharge current, kW per cell. Runs in your browser, work shown.

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Motor Formulas Calculator — Synchronous Speed, Slip, Torque, Horsepower, Current, NEMA Frame

120 f / P, slip, T = 5252 hp / rpm, hp from torque, kW and current at PF and efficiency, NEMA frame shaft height, belt ratio. Runs in your browser, work shown.

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Battery Bank Calculator — Ah from Loads, Days of Autonomy, DoD, Series / Parallel, Recharge Time

Daily watt-hours from a load list, days of autonomy, depth of discharge, inverter efficiency, cold and aging margins → Ah, batteries in series and parallel, kWh, recharge time. Runs in your browser, work shown.

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Working Space Checker (110.26)

Table 110.26(A)(1) depth by voltage and condition, width, height, dedicated space, egress rules. Runs in your browser, work shown.

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Generator Sizing Calculator

Load schedule with starting methods and NEMA codes, step loading, derates, nonlinear oversizing, standard kW. Runs in your browser, work shown.

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Panel Load Balance Calculator

Phase totals, imbalance, neutral current, and a rebalanced assignment with the moves. Runs in your browser, work shown.

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Extension Cord and Flexible Cord Size Calculator — NEC Table 400.5(A)(1) Ampacity and Voltage Drop

The cord gauge for a load over a length — Table 400.5(A)(1) ampacity with the bundling and ambient factors, and the drop that stalls the tool. Runs in your browser, work shown.

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Cut List Optimizer

Strut, conduit, tray, all-thread — fewest sticks, least waste, kerf and remnants, buy list. Runs in your browser, work shown.

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Wire Reel and Cut-Length Optimizer

Pull schedule → reels to buy, cut plan per reel, scrap, weight — or cut to length. Runs in your browser, work shown.

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Buy Quantity Calculator

Takeoff → sticks, reels, boxes with waste factors, rounding, and cost. Runs in your browser, work shown.

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Procurement Lead-Time Calculator

Install date → on-site, ship, release, approval, submit-by — working days, holidays, review cycles. Runs in your browser, work shown.

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Duct Bank Concrete Calculator

Encasement by section: conduit matrix or trench dims, conduits deducted by OD, waste, yards, trucks, rebar. Runs in your browser, work shown.

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Concrete Pads, Bases, and Excavation Calculator

Equipment pads with rebar mats, round or square bases, manhole excavation, spoil, and backfill tonnage. Runs in your browser, work shown.

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Concrete Formwork Lateral Pressure Calculator — ACI 347R Walls and Columns

Lateral pressure on wall and column forms from height, placement rate, temperature, unit weight, and mix chemistry. Runs in your browser, work shown.

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Thrust Block Calculator — Pipe Bends, Tees, and Dead Ends

Thrust from test pressure and fitting geometry, bearing area from the allowable soil bearing and a safety factor. Runs in your browser, work shown.

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Rebar Takeoff Calculator — Bar Count, Laps, Sticks, and Tonnage for Slabs and Walls

Bars per direction from spacing, laps where the run exceeds stock, sticks, weight, and tons — one way or a mat, one or two layers. Runs in your browser, work shown.

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Trench Excavation Calculator — OSHA Sloping, Cut, Spoil, Trucks, Bedding, Backfill

Cut and spoil with the OSHA 1926 Subpart P slope for the soil type, swell, truck loads, bedding, pipe displacement, compacted backfill, and the protective-system triggers. Runs in your browser, work shown.

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Earthwork Calculator — Grid Cut and Fill, Stockpile Volume, Aggregate Tonnage, Grade and Slope

Grid-method cut and fill with swell and shrinkage, cone / windrow / flat-top stockpiles to yards and tons, aggregate or asphalt tonnage for an area and depth, grade percent / ratio / degrees. Runs in your browser, work shown.

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Rigging Calculator — Sling Tension, CG, Crane Chart, Outrigger Pads

Sling tension by angle and hitch, offset-CG leg loads, hardware utilization, crane-chart check with deductions, outrigger pad size. Runs in your browser, work shown.

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Gear Rigging Path Check

Skid through every door, corridor, ramp, elevator, and floor on the route — clearances, turns, grades, floor and point loads. Runs in your browser, work shown.

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Truck Load Planner

Cube, weight, pallet positions, which truck and how many, LTL vs FTL, density-based freight class. Runs in your browser, work shown.

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Packing List and Bill of Lading Generator

Pieces by kit or work package → a printable packing list and straight bill of lading with classes and totals. Runs in your browser, work shown.

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Crane Wind Load Calculator — Sail Area, Wind Force, Percent of Chart, Stop-Work Wind

Wind pressure and force on the load from speed, sail area, and drag coefficient; percent of chart with deductions; side-load and stop-work checks. Runs in your browser, work shown.

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NFPA 70E Boundaries and PPE Category Calculator

Shock approach boundaries and the arc-flash PPE category method — refuses when the equipment is outside the table's parameters. Runs in your browser, work shown.

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TRIR, DART, and Severity Rate Calculator

OSHA incident rates on the 200,000-hour basis, with headroom against a target TRIR. Runs in your browser, work shown.

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Rubber Insulating Glove Class and Test Log

ASTM D120 class by exposure voltage, 6-month retest dates, air-test record, printable log. Runs in your browser, work shown.

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Assured Equipment Grounding Conductor Program Log

OSHA's 3- and 6-month test intervals plus the other triggers, test records for cords, tools, and receptacles — colour coding is one permitted record, not a requirement. Runs in your browser, work shown.

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Method of Procedure (MOP) Builder

A data-center MOP laid out with risk level, prerequisites, PPE, hazards, steps with hold points, back-out, contacts, approvals — print or share by link. Runs in your browser, work shown.

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Noise Dose and TWA Calculator — OSHA 1910.95 and NIOSH REL

Daily noise dose and 8-hour TWA from each sound level and duration — OSHA 5 dB exchange or NIOSH 3 dB. Runs in your browser, work shown.

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Fall Clearance Calculator — Lanyard or SRL, ANSI Z359 / OSHA 1926.502

Lanyard length, deceleration, harness stretch, D-ring height, and margin against the anchor height — with the 6 ft free-fall check. Runs in your browser, work shown.

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Heat Index and WBGT Calculator — NWS Heat Index Categories, Wet-Bulb Globe Temperature

Heat index from temperature and humidity with the NWS categories, or WBGT from natural wet-bulb, globe, and dry-bulb readings. Runs in your browser, work shown.

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NIOSH Lifting Equation Calculator — Recommended Weight Limit and Lifting Index

RWL and lifting index from H, V, D, A, frequency, duration, and coupling — the Applications Manual's tables, verified against its worked examples. Runs in your browser, work shown.

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Scaffold Load Calculator — OSHA 1926.451 Duty Ratings, Plank Spans, Leg Loads at 4:1, Tie-Off Height

Platform load by duty (25 / 50 / 75 psf) vs the people and material, Appendix A plank spans, leg load (the scaffold's own weight plus 4 × the load on that leg) against the frame capacity, and the 4:1 height-to-base tie rule. Runs in your browser, work shown.

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Torque Values and Verification Log — NEC Annex I (UL 486A-B) Tables I.2 and I.3

Recommended torque for Allen / square-drive and small slotted screws when the manufacturer gives none, and a printable log of every termination torqued. Runs in your browser, work shown.

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Insulation Resistance (Megger) Test Log — Temperature Correction, PI, DAR

Megger readings corrected to 40 °C, pass/fail against the minimum you set, PI and DAR, printable log. Runs in your browser, work shown.

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Panel Circuit Directory and Label Generator — NEC 408.4(A)

Numbers the circuits odd-left / even-right with multi-pole devices in place, checks 408.4(A) identifications, prints the directory and a label sheet, totals the phases. Runs in your browser, work shown.

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Fiber Optic Link Loss Budget Calculator — TIA-568 Attenuation, Connectors, Splices

Cable, connector, and splice loss against the transceiver's power budget and your margin — and how far the optics reach. Runs in your browser, work shown.

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PoE Power Budget Calculator — IEEE 802.3af/at/bt Classes per Switch

Adds up the PSE power the switch allocates per class and device count against its budget, with cable loss and port count. Runs in your browser, work shown.

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dB Calculator — dBm to mW, Gain/Loss Chain, VSWR, Free-Space Path Loss

dBm to mW, a gain/loss chain through cable and splitters, VSWR, return loss and mismatch loss, and free-space path loss. Runs in your browser, work shown.

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Communications Cable Conduit Fill Calculator — TIA-569 Fill for Cat 6A, Fiber, and Coax

Fill of a conduit, the smallest conduit for a bundle, or how many of one cable fit — TIA-569 limits on the verified raceway dimensions, jam-ratio check. Runs in your browser, work shown.

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Rack-U Planner — Space, Weight, Power, and PDU Outlets with A/B Redundancy

Sum the U, weight, watts, and plugs of the equipment against the rack, the PDUs at their continuous-load rating (80 % of the plug rating unless the PDU is listed for 100 %), and the outlet count — with the single-side check for A/B feeds. Runs in your browser, work shown.

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Jobsite Calculator — Feet, Inches, Fractions, Triangles, Circles, Running Tape

Feet-inch-fraction math, right triangles and pitch, circles and arcs, and a running tape — snapped to 1/16 in. Runs in your browser, work shown.

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Unit and Fastener Converter — Length, Pressure, Torque, Power, Inch and Metric Bolts

Every unit a job site argues about, plus inch and metric bolt sizes, threads per inch, pitch, and wrench sizes. Runs in your browser, work shown.

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AC to DC Converter — RMS, Peak, Rectifier Output, Inverter Battery Current

Sine-wave RMS, peak and average, rectifier DC output with diode drops and ripple, inverter battery current and run time, W to VA. Runs in your browser, work shown.

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NEMA Plug and Receptacle Chart — Straight-Blade and Locking Configurations by Voltage and Amps

Search NEMA WD 6 configurations (5-15 to L23-30) by voltage, amps, locking, or number — poles, wires, and what each is for. Runs in your browser, work shown.

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NEMA Enclosure Type Selector and IP Rating Decoder — NEMA 250 and IEC 60529

Pick the NEMA type for the location, see what each type protects against, decode an IP code — with NEMA's IEC cross-reference. Runs in your browser, work shown.

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Wire Color Code Reference — NEC, IEC, UK, Canada, Australia

Conductor identification by code and by convention: NEC 200.6 / 250.119 / 110.15, North American phase colours, IEC 60446, BS 7671 old and new, CE Code, AS/NZS 3000. Runs in your browser, work shown.

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Electrical Formula Sheet — Ohm's Law, AC Power, Voltage Drop, Motors, Transformers, Reactance, Conversions

Sixty-plus formulas by group with a search — the reference card behind the calculators. Runs in your browser, work shown.

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Duct Sizer (Equal Friction) and Air Calculator

Round and rectangular sizing by friction rate and velocity, a size check, cfm to Btu/h, psychrometrics. Runs in your browser, work shown.

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Fan Laws, Grille Sizing, and Hydronic Flow Calculator — Affinity Laws, Face Velocity, GPM from ΔT

New CFM, static pressure, and BHP at a new speed; grille face area from CFM and velocity; GPM from BTU/h and ΔT with glycol correction and pipe velocity. Runs in your browser, work shown.

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Psychrometric Calculator — Dew Point, Wet Bulb, Humidity Ratio, Enthalpy, Coil Load

State point from dry bulb and RH / wet bulb / dew point at the site altitude (ASHRAE formulas); sensible, latent, and total load from CFM and the change. Runs in your browser, work shown.

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Pipe Pressure Loss, Velocity, Slope, and Volume Calculator

Hazen–Williams loss and velocity in Sch 40, copper L, PVC; size for a velocity; drain slope, fall, invert; volume and weight. Runs in your browser, work shown.

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Glycol Fill Calculator — System Volume from Pipe Segments and Equipment, Glycol and Water Gallons, Freeze Point

Pipe-by-pipe system volume plus equipment, glycol and water gallons at the concentration, approximate freeze point. Runs in your browser, work shown.

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Framing Calculator — Stud Walls, Rafters, Stairs

Stud walls with openings, plates, headers, sheathing, board feet; common rafters and cuts; stairs against the IRC limits. Runs in your browser, work shown.

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Hip and Valley Rafter Calculator — Lengths per Foot of Run, Jack Rafter Differences, Floor Joist Takeoff

Hip / valley and common lengths from the run, pitch, and overhang, jack rafter common difference and count, and the floor joist, rim, and subfloor takeoff. Runs in your browser, work shown.

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Structural Steel Weight Takeoff

Members by designation (W, S, HP, C, L, HSS, plate, bar, pipe) → weight, tons, pieces; plate weights. Runs in your browser, work shown.

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Metal Deck and Grating Takeoff and Weld Consumable Calculator — Sheets, Weight, Electrode Pounds

Deck or grating sheets from the area, coverage width, length, lap, and waste with the weight; electrode or wire pounds for fillet welds by leg, length, and process. Runs in your browser, work shown.

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Masonry Takeoff — Brick, Block, Mortar, Grout, Rebar

Units from the wall and openings, mortar bags, grout yards for cells or full, vertical bars, bond beams, joint reinforcement. Runs in your browser, work shown.

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Masonry Veneer Tie, Flashing, and Weep Calculator — TMS 402-22 Spacings

Ties from the veneer area by the 2022 Basic or Enhanced method plus every unsupported edge, flashing lineal feet by level, weeps at the spacing. Runs in your browser, work shown.

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Fire Sprinkler Hydraulics — Demand, K-Factor, Friction, Layout

Remote-area demand from density and coverage, K-factor flow and pressure, Hazen–Williams in steel, head layout for a room. Runs in your browser, work shown.

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Hydrant Flow Test Calculator — NFPA 291 Pitot Flow and Supply Curve at 20 psi

Flow from the pitot reading and outlet, then the N¹·⁸⁵ supply curve and the flow available at 20 psi. Runs in your browser, work shown.

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