Watt-Hours (Wh) to Kilowatt-Hours (kWh) Converter
Enter a value to instantly convert between energy units.
1 Watt-Hour = 0.001 Kilowatt-Hour
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
kWh = Wh ÷ 1000Both are electrical energy units; the difference is scale. Watt-hours describe portable electronics (batteries, phones, power banks), while kilowatt-hours measure household or utility electricity (your monthly bill). You convert from Wh to kWh when comparing a portable device's energy capacity to household consumption — a laptop battery (100 Wh = 0.1 kWh) might provide 10% of a home's daily electricity use, putting device energy in household perspective.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A smartphone user checking battery capacity. 15 Wh (0.015 kWh) — if electricity costs $0.15/kWh, a full charge costs about $0.0023 (less than 1 cent).
15 Wh = 0.015 kWh
A power bank spec. 1000 Wh (1 kWh) capacity, marketed as 'a full day of home electricity' — though real homes use 20–50 kWh/day, making this a meaningful portable backup.
1000 Wh = 1 kWh
A portable generator specs. 50 Wh of solar charging (0.05 kWh/day under peak sun) helps a camper understand: after 20 sunny days, it replaces 1 kWh, or runs a 5W LED lamp continuously.
50 Wh = 0.05 kWh
A backup power bank for emergencies. 400 Wh (0.4 kWh) can charge a laptop once or run a WiFi router for ~20 hours without grid power, quantified for disaster preparedness planning.
400 Wh = 0.4 kWh