Home electrical and power math, with the working shown
Turn a load, a run length or a box into the size or count to buy. All nineteen calculators are ready.
MethodPhysics and published maker data, two sources or more behind each figure, and the working printed under every answer. Typical figures: your code edition and your local inspector decide. How we calculate
Wire & Voltage
3 of 3 ready
Conduit & Boxes
2 of 2 ready
Power & Load
5 of 5 ready
- PL-01Onwatts · amps · voltsWatts to Amps1,500 W · 120 V12.5 A, Caution
- PL-02Onamps · watts · breakerBreaker Size7,200 W · 240 V40 A
- PL-03Onrunning · peak wattsGenerator SizePeak 5,070 W3,270 W
- PL-04OnAh · Wh · runtimeAmp Hours to Watt Hours200 Ah · 12 V · 500 W3.4 h
- PL-05Onwatts · surge · ampsInverter SizeSurge 1,810 W1,513 W
Solar & Energy Cost
4 of 4 ready
Heating & Cooling
5 of 5 ready
- HC-01Onroom · sun · tonsBTU and AC Size200 sq ft · very sunny7,200 BTU/h, No reading
- HC-02Onroom · ACH · fanCFM720 ft³ · 8 ACH96 CFM, No reading
- HC-03OnCFM · friction · inchesDuct Size400 CFM · 0.10 in. w.c.9.7 in, Within 900 fpm
- HC-04Onshowers · gallonsWater Heater Size3 showers · busiest hour87 gallons, No reading
- HC-05Ongas · HSPF2 · $/yrHeat Pump Cost800 therms gas · HSPF2 7.8$1,493/yr, Estimate