Converters
12
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 Kilowatt-hour equals
| Unit | Value |
|---|---|
| Joule J | 3600000 |
| Kilojoule kJ | 3600 |
| Calorie cal | 860420.650096 |
| Kilocalorie kcal | 860.420650096 |
| Watt-hour Wh | 1000 |
| British thermal unit BTU | 3412.14163313 |
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
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.