Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Watt-hours to BTU (International Table)
Convert Wh to BTU instantly, then review the formula, assumptions, and rounding guidance.
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 3600 ÷ 1055.05585262. 1 Wh = 3.4121 BTU
Common examples
One value, several units
Joules3,600 J
Kilojoules3.6 kJ
Megajoules0.0036 MJ
Kilowatt-hours0.001 kWh
Thermochemical calories860.4207 cal
Kilocalories0.8604 kcal
BTU (International Table)3.4121 BTU
Conversion table
| Wh | BTU |
|---|---|
| 1 Wh | 3.4121 BTU |
| 2 Wh | 6.8243 BTU |
| 5 Wh | 17.0607 BTU |
| 10 Wh | 34.1214 BTU |
| 25 Wh | 85.3035 BTU |
| 50 Wh | 170.6071 BTU |
| 100 Wh | 341.2142 BTU |
Conversion chart
1 Wh3.4121 BTU
5 Wh17.0607 BTU
10 Wh34.1214 BTU
25 Wh85.3035 BTU
50 Wh170.6071 BTU
Worked example
1 kilowatt-hour equals exactly 3.6 megajoules.
Unit definition
Watt-hours (Wh) One watt-hours equals 3,600 joule.
Unit history
Watt-hours 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 Wh to joule.
3. Convert the base value to BTU and apply your display precision.
Understand the result before using it
Watt-hours to BTU (International Table) converts a value measured in Watt-hours (Wh) into the equivalent value in BTU (International Table) (BTU). 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 × 3600 ÷ 1055.05585262
Assumptions
- Watt-hours and BTU (International Table) represent the same energy, work & heat quantity.
- The input is expressed in Wh; the output is expressed in BTU.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 Wh = 3.41214163313 BTU. 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 Wh measurement in a document that expects BTU.
- Compare a watt-hours value with a value reported in btu (international table).
- Check the Wh-to-BTU arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse Wh 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 Watt-hours to BTU (International Table)?
result = input × 3600 ÷ 1055.05585262 Using the displayed relationship, 1 Wh equals 3.41214163313 BTU.
How many BTU (International Table) are in one Watt-hours?
One Watt-hours is 3.41214163313 BTU (International Table). The displayed digits may be rounded.
Can I reverse the Wh to BTU conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts BTU back to Wh.
Is the Watt-hours to BTU (International Table) 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.