OneTaskEnergy Calculators
Electricity Cost, Battery Life, EV Charging and Air Conditioner Sizing Calculators
Calculators for energy and power. Work out what an appliance costs to run, how long solar panels take to pay back, battery life, air conditioning size, PC power supply wattage and Ohm's law. Enter your own tariff for accurate costs.
21 tools tagged Energy
Air Conditioner Sizing Calculator
Air conditioner size in kW and BTU for a room, adjusted for climate.
Appliance Running Cost Calculator
What an appliance costs to run per hour, day, month and year.
Battery Life Calculator
How long a battery lasts from capacity and load, allowing for efficiency.
Battery Sizing Calculator
Battery capacity in kWh and Ah from nightly use, autonomy and depth of discharge.
UpdatedElectricity Cost Calculator
Bill from kWh and tariff, with supply charge, per day, month and year.
Energy Calculator
Kinetic, potential, electrical and mass energy in joules and kWh.
EV Charging Cost Calculator
Cost, range and time for an EV charge, compared with petrol.
Generator Size Calculator
Generator watts from your appliances' running and starting loads.
Heating And Cooling Cost Calculator
Running cost of heating or cooling from output, hours and your price.
Joules To KWh
Convert joules to kilowatt-hours: divide by 3.6 million.
KJ To Calories
Convert kilojoules on a food label to calories: divide by 4.184.
Lumens Calculator
Lumens, bulbs and LED watts for a room from its size and use.
Ohm's Law Calculator
Enter any two of volts, amps, ohms and watts to get the other two.
Pool Cost Calculator
Pool volume, build, fill and yearly running cost at your rates.
UpdatedPSU Wattage Calculator
Power supply wattage for a build, with GPU transient spikes and headroom included.
Solar Installation Cost Calculator
Solar system cost from size, your price per watt and battery.
Solar Panel Sizing Calculator
System size, panel count and roof area from your daily kWh and sun hours.
Solar Payback Calculator
Solar payback period and 25-year savings, including feed-in tariff on exports.
Solar System Simulator
3D planets in their real positions for any date, with orbits and time control.
Solarpunk Name Generator
Given names, commune names, cooperative names and garden city names for the green future.
Transformer Calculator
Turns ratio, secondary turns and primary current from two voltages.