Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Watts to BTU per hour Converter
1 W ≈ 3.41214163313 BTU/h. Enter a value to convert W to BTU/h, then use the formula and table below. Displayed digits may be rounded.
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 1 ÷ 0.293071070172. 1 W ≈ 3.4121 BTU/h
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Kilowatts0.001 kW
Megawatts1.00000e-6 MW
Mechanical horsepower0.0013 hp
Metric horsepower0.0014 PS
BTU per hour3.4121 BTU/h
Conversion table
| W | BTU/h |
|---|---|
| 1 W | 3.4121 BTU/h |
| 2 W | 6.8243 BTU/h |
| 5 W | 17.0607 BTU/h |
| 10 W | 34.1214 BTU/h |
| 25 W | 85.3035 BTU/h |
| 50 W | 170.6071 BTU/h |
| 100 W | 341.2142 BTU/h |
Conversion chart
1 W3.4121 BTU/h
5 W17.0607 BTU/h
10 W34.1214 BTU/h
25 W85.3035 BTU/h
50 W170.6071 BTU/h
Worked example
1 W ≈ 3.41214163313 BTU/h. Apply the selected conversion formula to other input values.
Unit definition
Watts (W) One watts equals 1 watt.
Unit history
The watt is named for James Watt and is the SI unit of power, equal to one joule per second.
Step by step
1. Parse the value, including fractions.
2. Convert W to watt.
3. Convert the base value to BTU/h and apply your display precision.
Understand the result before using it
Watts to BTU per hour converts a value measured in Watts (W) into the equivalent value in BTU per hour (BTU/h). 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 × 1 ÷ 0.293071070172
Assumptions
- Watts and BTU per hour represent the same power quantity.
- The input is expressed in W; the output is expressed in BTU/h.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 W ≈ 3.41214163313 BTU/h. 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 W measurement in a document that expects BTU/h.
- Compare a watts value with a value reported in btu per hour.
- Check the W to BTU/h arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse W 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 Watts to BTU per hour?
result = input × 1 ÷ 0.293071070172. Input is in W; result is in BTU/h. 1 W ≈ 3.41214163313 BTU/h. The displayed digits may be rounded.
What is 1 W in BTU/h?
1 W ≈ 3.41214163313 BTU/h. The displayed digits may be rounded.
Can I reverse the W to BTU/h conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts BTU/h back to W.
Is the Watts to BTU per hour 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.