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Energy converter

Calculate, convert and check circuit values in your browser.

Inputs

Results

J
1 J
kJ
0.001 kJ
Wh
0.0002777777778 Wh
kWh
0.0000002777777778 kWh
BTU (IT)
0.0009478171203 BTU (IT)
cal (th)
0.2390057361 cal (th)
kcal (th)
0.0002390057361 kcal (th)
eV
6,241,509,074,000,000,000 eV

Questions, examples and engineering limits

Convert J, Wh, kWh, IT BTU and thermochemical calories. Check examples and distinguish stored energy from power in watts.

Content updated:

How is Energy Converter: Joules, kWh, BTU and Calories calculated?

Use 1 Wh = 3600 J. Convert J, Wh, kWh, IT BTU and thermochemical calories. Check examples and distinguish stored energy from power in watts.

Sources: nist.gov [1]

How do I calculate this example: 1 kWh?

3600000 J = 3.6 MJ. This is a calculated example under the model stated above; it is not a measured component specification.

Which units does Energy Converter: Joules, kWh, BTU and Calories use?

J, kJ, Wh, kWh, BTU (IT), cal (th), kcal (th), eV. Convert prefixes before substituting values; keep the input and output units attached to every number.

Sources: nist.gov [1]

Are kW and kWh the same?

kW measures power; kWh measures energy. A constant 2 kW load running for 3 hours uses 6 kWh.

Sources: nist.gov [1]

How many J are in 1 BTU (IT)?

1 BTU (IT) = 1055.05585262 J. 1 cal (th) = 4.184 J.

Sources: nist.gov [1]

Can I convert mAh directly to Wh?

You also need voltage: Wh ≈ Ah × average battery voltage. Different-voltage batteries cannot be compared by mAh alone.

Sources: nist.gov [1]

Answers use the stated model and units. Examples are calculated values, not measurements or component ratings.