kWh Other
Measures: Energy — how much work can be done
Kilowatt-hour
The unit your electricity bill counts.
EnergyHow it's defined
One kilowatt of power sustained for one hour: exactly 3,600,000 joules. It is power × time — the most commonly misread pairing in any utility bill (a kW is a rate; a kWh is an amount).
1 kWh = 3.6 MJ — exacta 10 W bulb for 100 h = 1 kWh
Convert — honestly
kWh equals
3600000 J
Joule · factor exact — the base unit itself
860420.65 cal
Calorie (thermochemical) · factor exact — exact by definition (thermochemical)
Conversions run through the joule using the stated factors — no rounding beyond display precision, and every factor says whether it's exact or measured.
Where you meet it
- Energii-to-be — its core unit
- Electricity bills and EV battery sizes
Other ways to measure energy
Source
This page is an authored summary of the authoritative definition — checkable one click away.
NIST Special Publication 811 — Guide for the Use of the SI