Energy unit conversion

Enter a value in the space of the unit to immediately perform equivalent conversions between various units.

S.I. Units

joule

J

kilojoule

kJ

In classical mechanics, 1 Joule is equal to the energy required to apply a force of 1 Newton across a distance of 1 meter, that is, 1 J = 1 N⋅m.

Metric Units

International Steam Table calorie

cal

International Steam Table kilocalorie

kcal

Imperial Units

British thermal unit

BTU

Work = power × elapsed time

kilowatt-hour

kW∙h

horsepower-hour

hp∙h

Work = force × displacement in the direction of the force

Kilogram force meter

kgf∙m

lbf-ft

pound-force foot

lbf∙ft

Unit conversion relations

\[ 1 \; Kilojoule = 0.24 \; Kilocalorie = 0.95 \; British \;Thermal\; Unit \\[12pt] 1 \; \text{kJ} = 0.24 \; \text{kcal} = 0.95 \; \text{BTU} \]

\[ 1 \; kilowatt-hour = 1.34 \; horsepower-hour = 3600 \; kilojoules \\[12pt] 1 \; \text{kW} \cdot \text{h} = 1.34 \; \text{hp} \cdot \text{h} = 3600 \; \text{kJ} \]

\[ 1 \; Kilogram\; force\; meter = 9.81 \; Newton\; meter = 7.23 \; Pound\; force\; foot = 9.81 \; Joule \\[12pt] 1 \; \text{kgf} \cdot \text{m} = 9.81 \; \text{N} \cdot \text{m} = 7.23 \; \text{lbf} \cdot \text{ft} = 9.81 \; \text{J} \]