Converters
12
Pair-specific conversion guide
How to convert Kilojoule to Watt-hour
Use this Kilojoule to Watt-hour page for direct energy conversions. The calculator keeps the exact kJ to Wh relationship on the page, so the result, formula, and examples all describe this specific pair.
Formula model
1 kJ = 0.277777777778 Wh
1 Kilojoule equals
Quick factor: 1 kJ = 0.277777777778 Wh.
The current calculator value is 1 kJ, which equals 0.277777777778 Wh.
Use the conversion table to compare 1 kJ with the other units in the same category.
Guide
How to convert energy
Enter an energy amount and select the original and target units. Joules, calories, watt-hours, kilowatt-hours, and BTU are converted through joules.
Energy uses joules as the base unit: result = amount x source joule factor / target joule factor.
Examples
Energy conversion examples
Kilowatt-hours to joules
1 kWh
equals
3600000 J
Calories to joules
100 cal
equals
418.4 J
BTU to joules
1 BTU
equals
1055.05585262 J
Energy
All conversions
Joule to Kilojoule
Conversion library
Supported categories
Temperature
Celsius, Fahrenheit, and Kelvin with proper offset formulas.
deg C
deg F
K
Volume
Liters, cubic meters, and common US kitchen measures.
L
mL
m3
tsp
tbsp
fl oz
+4
Distance
Metric, imperial, nautical, and everyday distance units.
m
km
cm
mm
in
ft
+3
Data Byte
Bits, bytes, SI storage units, and binary storage units.
B
bit
KB
MB
GB
TB
+4
Mass
Grams, kilograms, tons, pounds, ounces, and stones.
kg
g
mg
t
lb
oz
+1
Area
Surface units from square millimeters to square miles.
m2
km2
cm2
mm2
ha
ac
+3
Speed
Meters per second, kilometers per hour, miles per hour, knots, and feet per second.
m/s
km/h
mph
kn
ft/s
Time
Exact time units from milliseconds to weeks.
s
ms
min
h
d
wk
Frequency
Hertz, kilohertz, megahertz, gigahertz, and revolutions per minute.
Hz
kHz
MHz
GHz
THz
rpm
Pressure
Pascals, bar, atmosphere, PSI, and torr.
Pa
kPa
bar
atm
psi
Torr
Energy
Joules, calories, watt-hours, kilowatt-hours, and BTU.
J
kJ
cal
kcal
Wh
kWh
+1
Angle
Degrees, radians, gradians, arcminutes, arcseconds, turns, and angular mils.
rad
deg
grad
'
''
turn
+1
Popular conversions
Energy links
Conversion table
1 Kilojoule equals
| Unit | Value |
|---|---|
| Joule J | 1000 |
| Calorie cal | 239.005736138 |
| Kilocalorie kcal | 0.239005736138 |
| Watt-hour Wh | 0.277777777778 |
| Kilowatt-hour kWh | 0.000277777777778 |
| British thermal unit BTU | 0.947817120313 |
Formula model
Base-unit conversion
Food calories are represented by kilocalories where appropriate; small calorie and kilocalorie units are both available.
base = amount * factor + offset
result = (base - targetOffset) / targetFactor
result = (base - targetOffset) / targetFactor
Scope
Fixed conversions first
Currency, crypto, and market-rate conversions need live exchange data, so they are kept separate from the fixed scientific units in this build.
Exact units
Lengths, masses, storage, time, and most derived units.
Offset units
Celsius, Fahrenheit, and Kelvin conversions.
FAQ
How to convert Kilojoule to Watt-hour
How do you convert Kilojoule to Watt-hour?
Use the formula 1 kJ = 0.277777777778 Wh. As a quick check, 1 kJ equals 0.277777777778 Wh.
Is the Kilojoule to Watt-hour conversion exact?
This page uses fixed constants from the Converter Science catalog. Displayed results are rounded only to keep the page readable.
FAQ
Energy converter questions
What is a kilowatt-hour?
A kilowatt-hour is the energy used by 1,000 watts over one hour.
Are calories and kilocalories both included?
Yes. The catalog includes calorie and kilocalorie as separate units.