Convert BTU/h to Watts – Power Converter
This converter translates a power flow specified in BTU per hour (BTU/h) to Watts (W). The relationship is fixed: 1 BTU/h equals approximately 0.29307107 W when using the International Table BTU definition.
Use this tool for HVAC sizing, appliance power comparison, and engineering checks. For highest assurance in regulated designs, verify which BTU definition your data source uses and cross-check final values against instrument calibration and applicable standards.
Governance
Record bcac354c906f • Reviewed by Fidamen Standards Committee
Interactive Converter
Convert between btu per hour and watt with precision rounding.
Quick reference table
| BTU per Hour | Watt |
|---|---|
| BTU 1.00 BTU/h | 0.29 W |
| BTU 5.00 BTU/h | 1.47 W |
| BTU 10.00 BTU/h | 2.93 W |
| BTU 25.00 BTU/h | 7.33 W |
| BTU 50.00 BTU/h | 14.65 W |
| BTU 100.00 BTU/h | 29.31 W |
Methodology
The conversion is a direct unit equivalence derived from the energy content of one BTU and the definition of one Watt as one joule per second. We apply the International Table BTU energy value and convert per hour to per second.
Results are presented as simple multiplications using a fixed conversion factor. Where regulatory or contractual work requires traceability, consult the referenced standards (NIST, ISO, IEEE) and document whether the International Table or thermochemical BTU was used.
Key takeaways
This is a fixed, one-input unit conversion from BTU/h to W using the International Table BTU. Use the thermochemical BTU factor if your source specifies that variant.
For regulatory or safety-critical uses, confirm unit definitions and instrument calibration. Small differences in BTU definitions produce differences on the order of 0.1% and should be documented where precision matters.
Worked examples
1 BTU/h → 0.29307107 W
5,000 BTU/h → 1,465.35535 W (5,000 × 0.29307107)
12,000 BTU/h → 3,516.85284 W (12,000 × 0.29307107)
F.A.Q.
What exact conversion factor is used?
This tool uses the International Table BTU, giving 1 BTU/h = 0.29307107 W. If your input uses the thermochemical BTU, the factor is slightly different; specify the BTU definition when precision is required.
How accurate are results?
Results are as accurate as the chosen conversion factor and numeric precision. The International Table BTU factor yields accuracy well within typical HVAC and appliance tolerances. For instrumentation-grade accuracy, follow NIST and ISO guidance and account for rounding and measurement uncertainty.
Do I need to consider environmental conditions?
The unit conversion itself does not depend on temperature or pressure. However, real-world power measurements of devices or heat flows can vary with operating conditions; include those effects separately in calculations or measurements.
Can this converter be used for billing or compliance?
It can be used for informational conversions. For billing, certification, or regulatory compliance, confirm the required unit definitions and tolerances with the governing body and reference standards.
Sources & citations
- National Institute of Standards and Technology (NIST) - Units and Standards — https://www.nist.gov
- International Organization for Standardization (ISO) — https://www.iso.org
- Institute of Electrical and Electronics Engineers (IEEE) — https://www.ieee.org
- Occupational Safety and Health Administration (OSHA) — https://www.osha.gov
- ISO 80000-4:2019 — Mechanics — https://www.iso.org/standard/64975.html
- NIST SP 811 — Guide for the Use of the International System of Units — https://www.nist.gov/pml/special-publication-811
Further resources
Related tools
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: bcac354c906fWhat changed (latest)
v1.0.0 • 2025-11-29 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-29 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 29, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-29 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: afb1c048551d