Energy Converter

Convert joules, calories, kWh, BTU and electronvolts.

Energy Converter

Universal unit converter engine

Conversion Category

From Value

Converted Result

Conversion Formula1 nm = 0.001 µm

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What does Energy Converter do?

Convert between eleven energy units spanning nutrition, electricity billing, heating and physics. Food Calories and thermochemical calories are handled distinctly, since they differ by a factor of a thousand.

How to Use Energy Converter

1
Enter an energy valueAny number.
2
Pick the unitsWatch the calorie distinction.
3
Read the conversionsEvery unit updates together.

Key Features

Eleven units from electronvolts to therms
Food Calories (kcal) distinguished from thermochemical calories
kWh included for electricity bill calculations
BTU and therm for heating and gas
All units shown at once

Frequently Asked Questions

Is a food Calorie the same as a calorie?

No — and the capital C is the only clue. A food Calorie is a kilocalorie, 1,000 small calories or 4,184 joules. A 500 Calorie meal is 500 kcal, not 500 cal.

How many joules in a kilowatt hour?

3,600,000. A kilowatt sustained for an hour is 1,000 watts × 3,600 seconds. That is why electricity is billed in kWh rather than joules — the numbers stay manageable.

What is a BTU?

The energy to raise one pound of water by one degree Fahrenheit, about 1,055 joules. It is standard for heating, air conditioning and gas appliances in the US and UK.

How do I work out an electricity cost?

Multiply the appliance power in kilowatts by the hours used to get kWh, then multiply by your tariff. A 2 kW heater for 3 hours uses 6 kWh.

100% Data Privacy

Conversions run in your browser using fixed, published factors. Nothing you enter is transmitted, and the tool keeps working with the network disconnected.