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: enter watts and hours used to see daily, monthly, and yearly running cost per appliance. Free, editable rates, no signup.
Battery Bank Calculator
Battery bank calculator sizes battery capacity in Ah and kWh from your daily load, voltage and days of autonomy. Free, editable rates, runs in your browser.
Battery Life Calculator
Battery life calculator: estimate device runtime from battery capacity in mAh or Wh and current draw. Editable efficiency losses, free, runs locally offline.
Breaker Size Calculator
Breaker size calculator: size a circuit breaker from appliance wattage or connected amps with the 80% NEC safety margin. Free, editable inputs, no signup.
Capacitance Calculator
Capacitance calculator: compute capacitance from charge and voltage, or series and parallel capacitor banks instantly. Free, no signup, runs in your browser.
Dehumidifier Sizing Calculator
Dehumidifier sizing calculator: find the pint capacity you need from your room size and dampness level. Free, editable inputs, runs locally, no signup.
Electric Bill Estimator
Electric bill estimator: turn appliance wattage, usage hours, and your rate into a monthly and yearly electricity cost forecast. Free, editable rates, no signup.
Furnace Size Calculator
Furnace size calculator: compute BTU output and tonnage needed from square footage, climate zone, and insulation. Editable rates, free, in your browser.
Generator Load Calculator
Generator load calculator: total running and starting watts for your appliances, then size the right generator. Editable loads, free, runs in your browser.
Generator Runtime Calculator
Generator runtime calculator: estimate run hours from fuel tank size, load, and consumption rate. Free, editable rates, runs locally in your browser, no signup.
Inductance Calculator
Inductance calculator: compute coil inductance from turns, core, and dimensions, or reactance from frequency. Free, private, runs in your browser, no signup.
Inverter Size Calculator
Inverter size calculator matches inverter wattage to your appliance loads with surge headroom for motors and pumps. Free, private, runs locally, no signup.
Lumens Calculator
Lumens calculator: convert lumens to watts and lux, or size the lighting a room needs from area and brightness target, so you buy the right bulbs. Free.
Power Factor Calculator
Power factor calculator: compute power factor plus real, reactive, and apparent power from kW and kVA readings. Free, runs in your browser, no signup.
RC Time Constant Calculator
RC time constant calculator: compute tau plus charge and discharge times from your resistor and capacitor values instantly. Free, editable values, no signup.
Solar Panel Savings Calculator
Solar panel savings calculator: estimate yearly and lifetime electricity savings from system size, rates, and sunlight. Editable rates, no signup, runs locally.
Transformer Calculator
Transformer calculator: compute secondary voltage, turns ratio, and current from primary and winding specs for single-phase units. Free, runs locally.
Wind Turbine Output Calculator
Wind turbine output calculator estimates power output and annual energy from rotor size, wind speed and efficiency. Free, runs in your browser, no signup.
Wire Size Calculator
Wire size calculator: pick correct wire gauge from load current, voltage drop, and cable run length. Editable conductor settings, free, runs locally offline.
Battery Runtime Calculator
Battery runtime calculator: estimate how long a battery lasts from capacity, voltage, load watts, and efficiency. Free, private, runs in your browser.
EV Charging Cost Calculator
EV charging cost calculator: estimate the cost to charge your electric car from battery size, electricity rate, and efficiency. Free, editable rates, no signup.
Electricity Cost Calculator
Electricity cost calculator: compute what any appliance costs to run from wattage, hours used, and your rate. Editable rates, free, runs locally in your browser.
LED Savings Calculator
LED savings calculator: compare LED vs incandescent bulbs and compute yearly energy cost savings and payback period. Free, runs in your browser, no signup.
Watts to Amps Calculator
Watts to amps calculator: convert watts to amps for DC, single-phase AC, or three-phase AC circuits using voltage and power factor. Free, private, no signup.