Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Kilocalories to Watt-hours
Convert kcal to Wh instantly, then review the formula, assumptions, and rounding guidance.
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 4184 ÷ 3600. 1 kcal = 1.1622 Wh
Common examples
One value, several units
Joules4,184 J
Kilojoules4.184 kJ
Megajoules0.0042 MJ
Watt-hours1.1622 Wh
Kilowatt-hours0.0012 kWh
Thermochemical calories1,000 cal
BTU (International Table)3.9657 BTU
Conversion table
| kcal | Wh |
|---|---|
| 1 kcal | 1.1622 Wh |
| 2 kcal | 2.3244 Wh |
| 5 kcal | 5.8111 Wh |
| 10 kcal | 11.6222 Wh |
| 25 kcal | 29.0556 Wh |
| 50 kcal | 58.1111 Wh |
| 100 kcal | 116.2222 Wh |
Conversion chart
1 kcal1.1622 Wh
5 kcal5.8111 Wh
10 kcal11.6222 Wh
25 kcal29.0556 Wh
50 kcal58.1111 Wh
Worked example
1 kilowatt-hour equals exactly 3.6 megajoules.
Unit definition
Kilocalories (kcal) One kilocalories equals 4,184 joule.
Unit history
Kilocalories 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 kcal to joule.
3. Convert the base value to Wh and apply your display precision.
Understand the result before using it
Kilocalories to Watt-hours converts a value measured in Kilocalories (kcal) 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 × 4184 ÷ 3600
Assumptions
- Kilocalories and Watt-hours represent the same energy, work & heat quantity.
- The input is expressed in kcal; the output is expressed in Wh.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 kcal = 1.16222222222 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 kcal measurement in a document that expects Wh.
- Compare a kilocalories value with a value reported in watt-hours.
- Check the kcal-to-Wh arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse kcal 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 Kilocalories to Watt-hours?
result = input × 4184 ÷ 3600 Using the displayed relationship, 1 kcal equals 1.16222222222 Wh.
How many Watt-hours are in one Kilocalories?
One Kilocalories is 1.16222222222 Watt-hours. The displayed digits may be rounded.
Can I reverse the kcal to Wh conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts Wh back to kcal.
Is the Kilocalories 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.