Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
BTU (International Table) to Watt-hours
Convert BTU to Wh instantly, then review the formula, assumptions, and rounding guidance.
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 1055.05585262 ÷ 3600. 1 BTU = 0.2931 Wh
Common examples
One value, several units
Joules1,055.0559 J
Kilojoules1.0551 kJ
Megajoules0.0011 MJ
Watt-hours0.2931 Wh
Kilowatt-hours0.0003 kWh
Thermochemical calories252.1644 cal
Kilocalories0.2522 kcal
Conversion table
| BTU | Wh |
|---|---|
| 1 BTU | 0.2931 Wh |
| 2 BTU | 0.5861 Wh |
| 5 BTU | 1.4654 Wh |
| 10 BTU | 2.9307 Wh |
| 25 BTU | 7.3268 Wh |
| 50 BTU | 14.6536 Wh |
| 100 BTU | 29.3071 Wh |
Conversion chart
1 BTU0.2931 Wh
5 BTU1.4654 Wh
10 BTU2.9307 Wh
25 BTU7.3268 Wh
50 BTU14.6536 Wh
Worked example
1 kilowatt-hour equals exactly 3.6 megajoules.
Unit definition
BTU (International Table) (BTU) One btu (international table) equals 1,055.05585262 joule.
Unit history
BTU (International Table) 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 BTU to joule.
3. Convert the base value to Wh and apply your display precision.
Understand the result before using it
BTU (International Table) to Watt-hours converts a value measured in BTU (International Table) (BTU) 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 × 1055.05585262 ÷ 3600
Assumptions
- BTU (International Table) and Watt-hours represent the same energy, work & heat quantity.
- The input is expressed in BTU; the output is expressed in Wh.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 BTU = 0.293071070172 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 BTU measurement in a document that expects Wh.
- Compare a btu (international table) value with a value reported in watt-hours.
- Check the BTU-to-Wh arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse BTU 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 BTU (International Table) to Watt-hours?
result = input × 1055.05585262 ÷ 3600 Using the displayed relationship, 1 BTU equals 0.293071070172 Wh.
How many Watt-hours are in one BTU (International Table)?
One BTU (International Table) is 0.293071070172 Watt-hours. The displayed digits may be rounded.
Can I reverse the BTU to Wh conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts Wh back to BTU.
Is the BTU (International Table) 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.