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

> Convert BTU per hour to watts: 1 BTU/h = 0.293071 W. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `btu-per-hour-to-watts` · Quantity: Power (`power`, base unit W) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/btu-per-hour-to-watts · This document: https://tttkmbb.com/conversion/btu-per-hour-to-watts.md · JSON: https://tttkmbb.com/conversion/btu-per-hour-to-watts.json (add `?value=` for a result)

## Formula

- `1 BTU/h = 0.293071 W`
- `watts = BTU per hour × 0.2930710702`
- Reverse: `BTU per hour = watts × 3.412141633`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 BTU/h = 1.46536 W
- 12.5 BTU/h = 3.66339 W
- 100 BTU/h = 29.3071 W

## Conversion table

| BTU per hour (BTU/h) | Watts (W) |
| --- | --- |
| 1 | 0.293071 |
| 2 | 0.586142 |
| 3 | 0.879213 |
| 4 | 1.17228 |
| 5 | 1.46536 |
| 6 | 1.75843 |
| 7 | 2.0515 |
| 8 | 2.34457 |
| 9 | 2.63764 |
| 10 | 2.93071 |
| 15 | 4.39607 |
| 20 | 5.86142 |
| 25 | 7.32678 |
| 30 | 8.79213 |
| 40 | 11.7228 |
| 50 | 14.6536 |
| 75 | 21.9803 |
| 100 | 29.3071 |
| 200 | 58.6142 |
| 250 | 73.2678 |
| 500 | 146.536 |
| 1000 | 293.071 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=BTU%2Fh&to_unit=W` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"BTU/h","to_unit":"W"}`
- All power units: https://tttkmbb.com/api/v1/units?quantity=power · full converter: [Power Converter](https://tttkmbb.com/conversion/power.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many watts are in one BTU per hour?**

1 BTU/h = 0.293071 W. 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 BTU per hour to watts?**

Multiply the value in BTU per hour by 0.2930710702: watts = BTU per hour × 0.2930710702. For example, 5 BTU/h = 1.46536 W.

**How do I convert watts back to BTU per hour?**

Multiply by the inverse factor 3.412141633 (BTU per hour = watts × 3.412141633), or use the watts-to-BTU per hour page.

## Related conversions

- [Watts to BTU per hour](https://tttkmbb.com/conversion/watts-to-btu-per-hour.md) (reverse)
- [Horsepower (mechanical) to Kilowatts](https://tttkmbb.com/conversion/hp-to-kw.md)
- [Kilowatts to Horsepower (mechanical)](https://tttkmbb.com/conversion/kw-to-hp.md)
- [Kilowatts to Watts](https://tttkmbb.com/conversion/kw-to-watts.md)
- [Watts to Kilowatts](https://tttkmbb.com/conversion/watts-to-kw.md)
- [Metric horsepower (PS) to Kilowatts](https://tttkmbb.com/conversion/ps-to-kw.md)
- [Kilowatts to Metric horsepower (PS)](https://tttkmbb.com/conversion/kw-to-ps.md)
- [Tons of refrigeration to Kilowatts](https://tttkmbb.com/conversion/tons-of-refrigeration-to-kw.md)
- [Kilowatts to Tons of refrigeration](https://tttkmbb.com/conversion/kw-to-tons-of-refrigeration.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)