What is a kilowatt-hour (kWh)?

A kilowatt-hour is the energy delivered by 1 kilowatt of power over 1 hour, equal to exactly 3,600,000 joules (3.6 MJ). It is the standard unit for electricity billing.

What is the difference between a calorie and a Calorie (kcal)?

The 'food Calorie' (capital C) used on nutrition labels is actually a kilocalorie (kcal): 1 kcal = 1,000 cal = 4,184 J.

How many joules are in a BTU?

1 International Table BTU (BTU_IT) equals 1,055.05585262 joules. It is widely used in HVAC and US heating/cooling specifications.

What is an electronvolt (eV) used for?

The electronvolt is a tiny energy unit used in atomic, nuclear and particle physics. 1 eV = 1.602176634 × 10⁻¹⁹ joules (CODATA exact value).

Energy Converteerer

Gratis energy unit converteerer. Converteer between J, kJ, MJ, cal, kcal, Wh, kWh, BTU, ft·lb and eV with NIST-grade precision.

Converteer between joules, calories, kWh, BTU, electronvolts and more.

E_{t o} = E_{f r o m} \times \frac{f _{f r o m}}{f _{t o}}

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Power Converteerer

Converteer between watts, kilowatts, megawatts, horsepower, and BTU/h.

Pressure Converteerer

Converteer between Pa, kPa, bar, psi, atm, mmHg and more pressure units.

Temperature Converteerer

Converteer between Celsius, Fahrenheit, Kelvin, Réaumur, and Rankine scales direct

Lengte Converteerer

Converteer between metric and imperial lengte units direct