Energy Converter: Wh, BTU, J and cal
Edit any energy value to convert watt-hours, International Table BTU, joules and thermochemical calories. The cal conversion explicitly fills an empty App method.
Inputs and reverse calculation
Calculated results
| Wh | 25 Wh |
|---|---|
| BTU | 85.304 BTU |
| J | 90 kJ |
| cal | 21.511 kcal |
cal uses the thermochemical value 4.184 J, filling an empty App implementation. BTU is the International Table BTU.
How to interpret the result
Watt-hours, BTU, joules and calories measure energy. Conversion uses joules as its internal base and updates the other three fields from the last edited value.
Formulas and units
J = Wh×3600 = BTU(IT)×1055.05585262 = cal(th)×4.184. Divide by the corresponding factor for the reverse conversion.
Worked example
1 Wh = 3600 J ≈ 3.412141633 BTU(IT) ≈ 860.4206501 cal(th). 1 cal(th) = 4.184 J; 1 kWh = 3.6 MJ.
Scope and limitations
cal means the thermochemical calorie, not the 4.1868 J International Table calorie. BTU uses the IT definition and retains the package factor 1055.05585262 J; the NIST table rounds this to 1055.056 J. The App cal input was present but inactive and is completed here. Wh is energy and W is power; converting between them requires time.
Common questions
How do I enter one dietary kilocalorie?
Enter 1000 in cal, giving 4184 J. A dietary kilocalorie is kcal, not a single cal.
Can this directly convert battery mAh?
mAh measures charge. Battery voltage is required: Wh ≈ Ah×V. A varying voltage requires integration; mAh alone does not determine Wh.
Related tools
Formula and data sources
Rebuilt from the extracted Electrodoc Pro 5.2 specification. Added, inferred and corrected behavior is identified in the limitations. Updated 2026-11-13.