Watts to BTU per hour (W to BTU/h)

Formula

1 W = 3.41214 BTU/h

BTU per hour = watts × 3.412141633 — reverse: watts = BTU per hour × 0.2930710702

The factor is derived from the SI definitions of both units (base unit: W) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

• 5 W = 17.0607 BTU/h
• 12.5 W = 42.6518 BTU/h
• 100 W = 341.214 BTU/h

Watts to BTU per hour conversion table

FAQ

How many BTU per hour are in one watt?

1 W = 3.41214 BTU/h. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert watts to BTU per hour?

Multiply the value in watts by 3.412141633: BTU per hour = watts × 3.412141633. For example, 5 W = 17.0607 BTU/h.

How do I convert BTU per hour back to watts?

Multiply by the inverse factor 0.2930710702 (watts = BTU per hour × 0.2930710702), or use the BTU per hour-to-watts page.

Related conversions

• BTU per hour to watts (reverse)
• Power Converter — all power units in one tool
• Horsepower (mechanical) to Kilowatts
• Kilowatts to Horsepower (mechanical)
• Kilowatts to Watts
• Watts to Kilowatts
• Metric horsepower (PS) to Kilowatts
• Kilowatts to Metric horsepower (PS)
• Tons of refrigeration to Kilowatts
• Kilowatts to Tons of refrigeration

Machine access

• API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=W&to_unit=BTU%2Fh
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"W","to_unit":"BTU/h"}
• Markdown: https://tttkmbb.com/conversion/watts-to-btu-per-hour.md · JSON: https://tttkmbb.com/conversion/watts-to-btu-per-hour.json (add ?value= for a result) · Units: /api/v1/units?quantity=power
• OpenAPI operationId: convert_units. Freshness: static. Authentication: none.

Sources

• NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors (standard)
• BIPM – The International System of Units (SI Brochure, 9th edition) (standard)
• Wikipedia – Conversion of units (reference)