Power Converter
Convert power between watts, kilowatts, megawatts, horsepower (mechanical and metric), and BTU/h. Useful for engineering, automotive and HVAC.
Educational estimate. Calculator results are for planning and information only, not financial, tax, medical, legal, or engineering advice. Verify important decisions with official sources or a qualified professional.
Power Converter
Watts, Horsepower, kW, BTU/h
📐 Formula & Method
Linear conversion
All units are stored as a multiplier against an internal base unit. To convert, the input is first scaled to the base, then divided by the target factor.
📋 How to Use
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1
Enter the numeric value you want to convert.
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2
Pick the source unit in the From dropdown.
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3
Pick the target unit in the To dropdown.
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4
Click Calculate. You will see the result, a full conversion table to every supported unit, and a list of common conversions.
💡 Key Insights
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1 kW = 1.34102 mechanical HP = 1.35962 metric PS. European car specs typically use PS (metric); US use mechanical HP.
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12,000 BTU/h = 1 ton of refrigeration ≈ 3.517 kW — standard AC sizing unit.
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A typical room AC is 5,000–24,000 BTU/h (1.5–7 kW).
🔬 Methodology & Accuracy
Formula: Linear unit conversion with high-precision constants. All math runs client-side in your browser using IEEE-754 doubles.
Data sources: BIPM SI brochure (9th ed.); NIST SP 811 (2008 ed.); ISO 80000-1 quantities and units.
Last reviewed: January 2026 · Accuracy: Results are precise to two decimal places using IEEE-754 double-precision arithmetic. Intended for educational and planning use only.
For informational purposes only. Results are estimates based on the inputs and formulas provided. For financial, tax, medical, or legal decisions, consult a qualified professional. Rates and regulations change — always verify current figures with official sources.
Accuracy & Feedback
❓ Frequently Asked Questions
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