Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Thermochemical calories to Watt-hours
Convert cal to Wh instantly, then review the formula, assumptions, and rounding guidance.
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 4.184 ÷ 3600. 1 cal = 0.0012 Wh
Common examples
One value, several units
Joules4.184 J
Kilojoules0.0042 kJ
Megajoules0 MJ
Watt-hours0.0012 Wh
Kilowatt-hours0 kWh
Kilocalories0.001 kcal
BTU (International Table)0.004 BTU
Conversion table
| cal | Wh |
|---|---|
| 1 cal | 0.0012 Wh |
| 2 cal | 0.0023 Wh |
| 5 cal | 0.0058 Wh |
| 10 cal | 0.0116 Wh |
| 25 cal | 0.0291 Wh |
| 50 cal | 0.0581 Wh |
| 100 cal | 0.1162 Wh |
Conversion chart
1 cal0.0012 Wh
5 cal0.0058 Wh
10 cal0.0116 Wh
25 cal0.0291 Wh
50 cal0.0581 Wh
Worked example
1 kilowatt-hour equals exactly 3.6 megajoules.
Unit definition
Thermochemical calories (cal) One thermochemical calories equals 4.184 joule.
Unit history
Thermochemical calories is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert cal to joule.
3. Convert the base value to Wh and apply your display precision.
Understand the result before using it
Thermochemical calories to Watt-hours converts a value measured in Thermochemical calories (cal) into the equivalent value in Watt-hours (Wh). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 4.184 ÷ 3600
Assumptions
- Thermochemical calories and Watt-hours represent the same energy, work & heat quantity.
- The input is expressed in cal; the output is expressed in Wh.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 cal = 0.00116222222222 Wh. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a cal measurement in a document that expects Wh.
- Compare a thermochemical calories value with a value reported in watt-hours.
- Check the cal-to-Wh arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse cal with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Thermochemical calories to Watt-hours?
result = input × 4.184 ÷ 3600 Using the displayed relationship, 1 cal equals 0.00116222222222 Wh.
How many Watt-hours are in one Thermochemical calories?
One Thermochemical calories is 0.00116222222222 Watt-hours. The displayed digits may be rounded.
Can I reverse the cal to Wh conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts Wh back to cal.
Is the Thermochemical calories to Watt-hours result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.