UOM Converter
Calculators for sizing and checking circuits and equipment: kVA, kW and amps on single- and three-phase systems, voltage drop and the wire size that keeps it within limits, power factor correction, transformer fault current, motor speed and slip, line-to-neutral voltage, Ohm's law and running cost. Each shows how it's calculated.
kVA · kW · ampsTransformer, generator and UPS sizing. Three-phase uses line-to-line volts.- Voltage dropVoltage drop on a run, and the smallest wire that keeps it within your target.
- Power factor correctionCapacitor kvar needed to raise a load's power factor, and what it does to kVA and current.
- Transformer fault currentFull-load current and the maximum fault current at a transformer's secondary terminals, from kVA and nameplate impedance.
- Motor speed & slipSynchronous speed from frequency and poles, slip from the nameplate speed, and the same motor on the other frequency.
- Line ↔ neutral voltageThree-phase wye systems: line-to-neutral = line-to-line ÷ √3.
- Ohm's lawEnter any two of volts, amps, ohms and watts to get the other two.
- Energy costWhat a load costs to run, and what a retrofit saves.
Quick answers
- kVA · kW · amps: 75 kVA at 208 V three-phase → Line current: 208.2 A
- Voltage drop: 12 AWG copper, 100 ft, 16 A at 120 V single-phase → Voltage drop: 5.15%
- Power factor correction: 100 kW from PF 0.8 to 0.95 → Capacitor needed: 42.1 kvar
- Transformer fault current: 1,000 kVA, 480 V three-phase, 5.75%Z → Maximum fault current: 20.9 kA
- Motor speed & slip: 4-pole motor at 60 Hz, 1,750 r/min nameplate → Synchronous speed: 1,800 r/min
- Line ↔ neutral voltage: 208 V line-to-line → Line-to-neutral: 120.1 V
- Ohm's law: 120 V and 1,500 W → Amps: 12.5 A
- Energy cost: 1,500 W for 8 h a day, 365 days a year → Per year: $657.00
Other topics
Pricing calculatorsCalculators for electrical distribution pricing: E/C/M price units, wire price per foot or metre, list × multiplier, margin and markup, packs and reels.
Wire size and conduit convertersConvert AWG and kcmil wire sizes to mm² and back, and conduit trade sizes to metric designators with their knockout punch sizes.
Unit convertersUnit converters for the electrical trade: feet to metres, inch fractions to mm, °C to °F, hp to kW, foot-candles to lux, torque, weight and box fill.
Product data toolsTools for electrical product data: UN/ECE Rec 20 UOM codes, spec values to metric for ETIM, unit prices from price quantities, UOM mix-ups and GTIN-14s.