Energy & Electrical
Energy & Electrical Calculators
Estimate electricity use, charging cost, battery runtime, current, and efficiency savings.
24 tools
Related growth hubs
Start with the hub when you want a decision path, not just one calculator.
Appliance Energy Cost Calculator
Appliance energy cost calculator: running cost from wattage, usage, and your electricity rate.
Battery Bank Calculator
Battery bank calculator: amp-hours for an off-grid system.
Battery Life Calculator
Battery life calculator: runtime from battery capacity, voltage, and load power.
Breaker Size Calculator
Breaker size calculator: breaker amps from load watts.
Capacitance Calculator
Capacitance calculator: capacitance from stored energy and voltage.
Dehumidifier Sizing Calculator
Dehumidifier sizing calculator: pints per day by room size and dampness.
Electric Bill Estimator
Electric bill estimator: monthly bill from kWh usage, rate, and fixed fees.
Furnace Size Calculator
Furnace size calculator: BTU and tonnage from square footage.
Generator Load Calculator
Generator load calculator: wattage needed for appliances.
Generator Runtime Calculator
Generator runtime calculator: hours on a tank of fuel.
Inductance Calculator
Inductance calculator: inductance from inductive reactance and frequency.
Inverter Size Calculator
Inverter size calculator: continuous and surge sizing.
Lumens Calculator
Lumens calculator: light output needed for a room.
Power Factor Calculator
Power factor calculator: PF from real watts and apparent volt-amps.
RC Time Constant Calculator
RC time constant calculator: charge/discharge time constant and charge percentage.
Solar Panel Savings Calculator
Solar panel savings calculator: annual savings and payback period from system size, cost, and utility rate.
Transformer Calculator
Transformer calculator: output voltage or turns ratio for an ideal transformer.
Wind Turbine Output Calculator
Wind turbine output calculator: power from blade size and wind speed.
Wire Size Calculator
Wire size calculator: suggested AWG for a current and run length (copper, 3% drop target).
Battery Runtime Calculator
Estimate ideal and adjusted battery runtime from capacity, voltage, load, efficiency, and usable depth.
EV Charging Cost Calculator
Estimate energy drawn, per-charge cost, monthly charging cost, and cost per mile for an EV.
Electricity Cost Calculator
Estimate appliance energy use and daily, monthly, and annual electricity cost.
LED Savings Calculator
Compare old and LED lighting energy cost, annual savings, and simple payback period.
Watts to Amps Calculator
Convert watts to amps for DC, single-phase AC, or three-phase AC with voltage and power factor.