About BTU to Watts

BTU to Watts exists to make one narrow problem dead simple: converting between compatible energy and power units with transparent constants and enough clarity for a curious homeowner. The calculator runs instantly in the browser, with no sign-up and no limits.

A live, two-way converter covering BTU/hr, watts, kilowatts, megawatts, tons of refrigeration, mechanical horsepower, kilocalories per hour, and kVA (with power factor). Every conversion uses the internationally-standardized factor 1 BTU/hr = 0.29307107 W, so results match what you would compute by hand.

Each pair has its own page with a dedicated calculator, interactive scale diagram, formula derivation, worked example, reference table, real-world use cases, and FAQ. The home page adds a live particle visualization, a power-explorer slider, a unit-parity ruler, and a room-sizing tool for HVAC applications.

• HVAC contractors cross-referencing BTU/hr to kW on European specs.
• Electrical engineers sizing UPS and generator cooling from kVA loads.
• Students solving thermodynamics problems.
• Homeowners comparing AC units across imperial and metric labels.
• Data-center operators translating IT load to cooling capacity.

BTU to Watts is maintained as a specialist reference site. We check formulas dimensionally, compare constants with the sources listed on our methodology page, test representative and reverse calculations, and review the explanatory text alongside each calculator. We do not claim that a unit conversion replaces equipment data or professional design work.

Readers can report a formula, wording, or accessibility problem by email. Reports are reproduced against the published calculator and corrected across the calculation, examples, metadata, and related pages where necessary.

Results are for estimation and education. For code-compliant sizing, safety-critical installations, or legal documentation, verify against manufacturer specifications and consult a licensed professional. Read the full Terms & Conditions for details.