How to use the energy unit calculator
Convert between common energy units. Enter energy in the field above; the joules, kwh, kcal, btu are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- E — Energy (MJ)
Worked example
With energy = 10 MJ, the calculator gives joules ≈ 10,000,000 J; kwh ≈ 2.777778 kWh; kcal ≈ 2,390.057 kcal; btu ≈ 9,478.134 BTU.
Frequently asked questions
What is the formula for the energy unit calculation?
Joules (J) = E × 1e6. kWh (kWh) = E / 3.6. kcal (kcal) = E × 1e6 / 4184. BTU (BTU) = E × 1e6 / 1055.06. Here E is energy (MJ).
What inputs do I need for the energy unit converter (joules, kwh, btu, kcal) calculator?
You need energy in MJ. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.