P6 → Excel Converter
Drop a Primavera P6 .xer export and get a clean workbook — Activities, Relationships, WBS, a P6-style banded view.
OpenCalculators
Field calculations, done properly. No account. No number you enter leaves your browser.
100 tools. Matches the tool name, its description, and the standard it cites.
Schedules & PM
Primavera P6 exports — converted, compared, sliced, and assessed.
Schedule Health Check
DCMA 14-point assessment on an XER — every check, threshold, pass/fail, and the activities to fix.
OpenSchedule Comparison
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.
OpenLook-Ahead
2- to 8-week look-ahead from the data date, by week and area, with what each activity is waiting on.
OpenLabor Histogram
Remaining or planned hours by week and resource, the peak, FTEs, the cumulative curve, unassigned activities.
OpenXER Viewer
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.
OpenCircuits & Conductors
Load calculations and sizing the wire — Article 220, drop, ampacity, terminations, grounding, transformers, motors, fault current.
Voltage Drop
Resistance or impedance method (Table 8 K, or Table 9 with power factor); size, drop, or max length.
OpenAmpacity & Derating
Table 310.16 with ambient, conductor count, and termination limits.
OpenWire Sizing
Minimum conductor for a load: ampacity, terminations, continuous load, and voltage drop.
OpenTransformer
Full-load currents, Table 450.3(B) protection, and kVA for a load.
OpenGrounding Conductors
Table 250.122 EGC by device, 250.122(B) upsizing, Table 250.66 GEC by service conductors.
OpenMotor Circuits
Table FLC, 125 % conductors, 430.52 device by type with Exception 1, nameplate overloads, disconnect, EGC; feeders for several motors.
OpenFault Current
Transformer kVA and %Z, utility contribution, conductor runs on Table 9 impedances, motor contribution — kA at each point.
OpenService & Feeder
From a calculated load to conductors, device, grounding electrode conductor or EGC, and bonding jumper in one pass — with the 310.12 dwelling rule.
OpenDwelling Load (220)
Standard and optional methods side by side, existing-dwelling check, EVSE, neutral, service size — line by line with the section.
OpenCommercial Load (220)
Lighting by occupancy with demand factors, receptacles, signs and show windows, kitchen, motors, HVAC — calculated load, continuous portion, neutral, service size.
OpenMultifamily Load (220)
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.
OpenSchools, Restaurants & Existing Loads (220)
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.
OpenEV Charging Circuit
The 125 % continuous rule for the device and conductors, the EGC, charge-time, and the 220.57 service load — with the EVEMS allowance.
OpenPV Strings & Source Circuits
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.
OpenHVAC Equipment Circuit
Minimum circuit ampacity and maximum overcurrent protection from the compressors, fans, and heat — then the wire and EGC.
OpenTransformer Inrush
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.
OpenData Center Power & Cooling Chain
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.
OpenVFD Circuit
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.
OpenLighting Layout & 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).
OpenBusway Load & Drop
Loading at the feed against the rating and the voltage drop tap by tap from the manufacturer's R and X per 1000 ft.
OpenRaceways, Boxes & Pulls
Fill, bends, boxes, tray, and getting the cable in.
Conduit Bend Total
Sum the bends between pull points against 360° or a 270° spec.
OpenConduit Fill
Chapter 9 Tables 1, 4, 5 — check a size, find the smallest, or count what fits.
OpenBox Fill
314.16 volume count — conductors, devices, clamps, studs, grounds.
OpenCable Tray Fill
392.22 — multiconductor cables or single conductors in ladder and ventilated tray.
OpenConduit Bending
Offsets, saddles, 90° stubs, segmented bends, kicks, gain — marks to the sixteenth.
OpenCable Pull
Pulling tension and sidewall pressure through the run — both directions.
OpenPull Box Sizing
314.28 — straight, angle, and U pulls from the raceway trade sizes.
OpenPower & Basics
Ohm's law, power, power factor, harmonics, UPS batteries, and unit conversions.
Ohm's Law
Any two of volts, amps, ohms, watts → all four.
OpenPower
Watts, volts, amps, and power factor — single- or three-phase.
OpenPower Triangle
kW, kVA, kVAR, and power factor from any two.
OpenPower Factor Correction
Capacitor kVAR to reach a target power factor.
OpenConductor Size Conversions
AWG and kcmil to circular mils, mm² and diameter.
OpenK-Factor
Harmonic loads by type or measured spectrum → K-factor, THDi, the K-rated transformer, and the neutral warning.
OpenUPS Battery Sizing
Load, runtime, DC bus, chemistry, aging and temperature factors → Ah, end voltage, discharge current, kW per cell.
OpenMotor Formulas
120 f / P, slip, T = 5252 hp / rpm, hp from torque, kW and current at PF and efficiency, NEMA frame shaft height, belt ratio.
OpenBattery Bank Sizing
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.
OpenSystems & Code Checks
Working space, standby power, and panel balance.
Working Space
Table 110.26(A)(1) depth by voltage and condition, width, height, dedicated space, egress rules.
OpenGenerator Sizing
Load schedule with starting methods and NEMA codes, step loading, derates, nonlinear oversizing, standard kW.
OpenPanel Balance
Phase totals, imbalance, neutral current, and a rebalanced assignment with the moves.
OpenFlexible Cords & Temp Power
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.
OpenProcurement & Prefab
Cut lists, reels, buy quantities, and lead times.
Cut Optimizer
Strut, conduit, tray, all-thread — fewest sticks, least waste, kerf and remnants, buy list.
OpenReel Optimizer
Pull schedule → reels to buy, cut plan per reel, scrap, weight — or cut to length.
OpenBuy Quantity
Takeoff → sticks, reels, boxes with waste factors, rounding, and cost.
OpenLead-Time Backward Pass
Install date → on-site, ship, release, approval, submit-by — working days, holidays, review cycles.
OpenCivil & Site
Concrete for duct banks, pads, bases, formwork, thrust blocks, rebar, trenches, and the holes they go in.
Duct Bank Concrete
Encasement by section: conduit matrix or trench dims, conduits deducted by OD, waste, yards, trucks, rebar.
OpenPads, Bases & Backfill
Equipment pads with rebar mats, round or square bases, manhole excavation, spoil, and backfill tonnage.
OpenFormwork Pressure
Lateral pressure on wall and column forms from height, placement rate, temperature, unit weight, and mix chemistry.
OpenThrust Block
Thrust from test pressure and fitting geometry, bearing area from the allowable soil bearing and a safety factor.
OpenRebar Takeoff
Bars per direction from spacing, laps where the run exceeds stock, sticks, weight, and tons — one way or a mat, one or two layers.
OpenTrench Excavation & Sloping
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.
OpenEarthwork — Cut & Fill, Piles, Tonnage, Grade
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.
OpenLogistics
Lifts, rigging paths, truck loads, and the paper that goes on the truck.
Rigging
Sling tension by angle and hitch, offset-CG leg loads, hardware utilization, crane-chart check with deductions, outrigger pad size.
OpenGear Path Check
Skid through every door, corridor, ramp, elevator, and floor on the route — clearances, turns, grades, floor and point loads.
OpenTruck Load
Cube, weight, pallet positions, which truck and how many, LTL vs FTL, density-based freight class.
OpenPacking List & BOL
Pieces by kit or work package → a printable packing list and straight bill of lading with classes and totals.
OpenCrane Pick in 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.
OpenSafety
NFPA 70E boundaries and PPE, incident rates, noise dose, fall clearance, heat stress, NIOSH lifting, glove and grounding logs, and methods of procedure.
Shock & Arc-Flash (70E)
Shock approach boundaries and the arc-flash PPE category method — refuses when the equipment is outside the table's parameters.
OpenTRIR / DART
OSHA incident rates on the 200,000-hour basis, with headroom against a target TRIR.
OpenRubber Glove Log
ASTM D120 class by exposure voltage, 6-month retest dates, air-test record, printable log.
OpenAssured Grounding 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.
OpenMOP 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.
OpenNoise Dose
Daily noise dose and 8-hour TWA from each sound level and duration — OSHA 5 dB exchange or NIOSH 3 dB.
OpenFall Clearance
Lanyard length, deceleration, harness stretch, D-ring height, and margin against the anchor height — with the 6 ft free-fall check.
OpenHeat Index & WBGT
Heat index from temperature and humidity with the NWS categories, or WBGT from natural wet-bulb, globe, and dry-bulb readings.
OpenNIOSH Lifting Equation
RWL and lifting index from H, V, D, A, frequency, duration, and coupling — the Applications Manual's tables, verified against its worked examples.
OpenScaffold Loading
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.
OpenField Logs & Records
Torque verification, insulation resistance, and the panel directory — the paper the inspector reads.
Torque Lookup & Verification Log
Recommended torque for Allen / square-drive and small slotted screws when the manufacturer gives none, and a printable log of every termination torqued.
OpenInsulation Resistance Log
Megger readings corrected to 40 °C, pass/fail against the minimum you set, PI and DAR, printable log.
OpenCircuit Directory & Panel Labels
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.
OpenLow Voltage
Fiber loss budgets, PoE budgets, decibel arithmetic, and comm cable conduit fill.
Fiber Loss Budget
Cable, connector, and splice loss against the transceiver's power budget and your margin — and how far the optics reach.
OpenPoE Budget
Adds up the PSE power the switch allocates per class and device count against its budget, with cable loss and port count.
OpendB & RF Link
dBm to mW, a gain/loss chain through cable and splitters, VSWR, return loss and mismatch loss, and free-space path loss.
OpenComm Cable Conduit Fill
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.
OpenRack-U Planner
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.
OpenReference & Jobsite
The jobsite calculator, unit and fastener conversions, AC to DC, NEMA plugs and enclosures, and wire colour codes.
Jobsite Calculator
Feet-inch-fraction math, right triangles and pitch, circles and arcs, and a running tape — snapped to 1/16 in.
OpenUnit & Fastener Converter
Every unit a job site argues about, plus inch and metric bolt sizes, threads per inch, pitch, and wrench sizes.
OpenAC to DC Converter
Sine-wave RMS, peak and average, rectifier DC output with diode drops and ripple, inverter battery current and run time, W to VA.
OpenNEMA Plug & Receptacle Finder
Search NEMA WD 6 configurations (5-15 to L23-30) by voltage, amps, locking, or number — poles, wires, and what each is for.
OpenNEMA Enclosure Types & IP
Pick the NEMA type for the location, see what each type protects against, decode an IP code — with NEMA's IEC cross-reference.
OpenWire Color Codes
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.
OpenElectrical Formula Sheet
Sixty-plus formulas by group with a search — the reference card behind the calculators.
OpenHVAC
Ducts, air, and heat.
Duct Sizer
Round and rectangular sizing by friction rate and velocity, a size check, cfm to Btu/h, psychrometrics.
OpenFan Laws, Grilles & Hydronic Flow
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.
OpenPsychrometrics
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.
OpenPlumbing
Pipe hydraulics, slope, and volume.
Pipe Flow & Slope
Hazen–Williams loss and velocity in Sch 40, copper L, PVC; size for a velocity; drain slope, fall, invert; volume and weight.
OpenGlycol Fill
Pipe-by-pipe system volume plus equipment, glycol and water gallons at the concentration, approximate freeze point.
OpenFraming
Stud walls, rafters, and stairs.
Wall, Roof & Stairs
Stud walls with openings, plates, headers, sheathing, board feet; common rafters and cuts; stairs against the IRC limits.
OpenHips, Valleys, Jacks & Joists
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.
OpenIronwork
Steel weights and takeoffs.
Steel Weight Takeoff
Members by designation (W, S, HP, C, L, HSS, plate, bar, pipe) → weight, tons, pieces; plate weights.
OpenDeck Sheets & Weld Consumables
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.
OpenMasonry
Brick, block, mortar, grout, and steel.
Brick & Block Takeoff
Units from the wall and openings, mortar bags, grout yards for cells or full, vertical bars, bond beams, joint reinforcement.
OpenMasonry Ties, Flashing & Weeps
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.
OpenFire Protection
Sprinkler hydraulics and layout.
Sprinkler Hydraulics
Remote-area demand from density and coverage, K-factor flow and pressure, Hazen–Williams in steel, head layout for a room.
OpenHydrant Flow Test
Flow from the pitot reading and outlet, then the N¹·⁸⁵ supply curve and the flow available at 20 psi.
OpenMembers
A whole schedule at once — sign in, then save what you run.
Batch Conductor Sizing · Members
A whole feeder and branch-circuit schedule at once — Excel template in, sized workbook out, saved to your account if you choose.
Open