Free Online Power Unit Converter
The fastest free Power Unit Converter online. Convert W, kW, MW, hp, PS, BTU/h, and J/s in real time — every field updates the moment you type, no button press needed.
These are the everyday situations where a Power Unit Converter eliminates confusion, prevents costly errors, and saves you from manual arithmetic.
European and Japanese car listings rate engine output in kilowatts, while US buyers compare horsepower. Without a Power Unit Converter, you can't meaningfully compare a 110 kW compact sedan with a 135 hp equivalent across brochures.
Air conditioner capacity in North America is printed in BTU/h, while energy ratings in the EU show watts or kilowatts. A Power Unit Converter bridges those two systems so you can correctly size equipment for a room without guessing.
CPU and GPU manufacturers publish thermal design power in watts, but uninterruptible power supply (UPS) units are often rated in VA or horsepower-equivalents. A Power Unit Converter lets you cross-check TDP totals against UPS capacity in seconds.
Most single-pair converters force you to repeat the process. This Power Unit Converter shows all seven units simultaneously so you can compare and decide in one glance.
W, kW, MW, hp, PS, BTU/h, and J/s — all visible at once. Edit any field in this Power Unit Converter and every other unit recalculates instantly. No dropdowns, no submit button.
Every input field in this Power Unit Converter is editable. Start from whichever unit you already know — watts, horsepower, or BTU/h — and let the tool handle the rest.
Each result in the Power Unit Converter has a dedicated copy icon. Tap it to send the value straight to your clipboard — ready to paste into a spec sheet, report, or chat.
The Power Unit Converter writes your active value and unit into the page URL (e.g. ?val=100&from=kw). Bookmark it, share it, or open it again later and your conversion loads instantly.
All calculations in this Power Unit Converter run locally in your browser. Results appear with zero network delay — no server round-trips, no lag, even on a slow connection.
This Power Unit Converter is completely free with no login or usage limits. Use it on desktop or mobile, online or offline — your data stays on your device at all times.
Three steps to convert any power value — watts, kilowatts, horsepower, or BTU/h — using this free Power Unit Converter.
Type a number into any of the seven input fields in the Power Unit Converter — W, kW, MW, hp, PS, BTU/h, or J/s. That value becomes the source for all other conversions.
As you type, the Power Unit Converter immediately recalculates and displays the equivalent in every other unit. No button press required — results refresh character by character.
Check the Reference Values panel below the converter to put your result in real-world context — see how your power value compares to everyday devices and machines.
Click the copy icon next to any result in the Power Unit Converter to send that value to your clipboard. Paste it directly into your spreadsheet, report, or design document.
From car buyers to HVAC engineers and PC builders, the Power Unit Converter bridges the unit gap across every industry and discipline.
Car enthusiasts and mechanical engineers switch between kW and hp constantly when comparing international spec sheets or tuning builds. The Power Unit Converter also handles metric horsepower (PS) used in German and Japanese documentation — so nothing gets lost in translation.
HVAC contractors and homeowners face BTU/h ratings on North American air conditioners alongside watt or kilowatt specs on European appliances. The Power Unit Converter makes BTU/h-to-kW comparisons instant, so you can correctly match cooling capacity to room size without a manual lookup table.
DIY PC builders need to total CPU, GPU, and peripheral TDP values in watts to choose the right power supply and UPS unit. The Power Unit Converter handles every power-related unit in a single interface — from component-level milliwatt specs to whole-rack kilowatt demands.
Answers to the most common questions about power units and how to use this Power Unit Converter.
Mechanical horsepower (hp) is the US/UK standard, defined as exactly 550 ft·lbf/s ≈ 745.70 W. Metric horsepower (PS, from German Pferdestärke) is defined as 75 kgf·m/s ≈ 735.50 W. The difference is about 1.4 %, which matters when comparing German or Japanese car specs with US figures. This Power Unit Converter calculates both accurately.
1 kW = 1.34102 hp (mechanical). To convert, multiply your kW value by 1.34102. For example, 100 kW × 1.34102 = 134.10 hp. The Power Unit Converter does this calculation automatically — type your kW value and read the hp result instantly.
BTU/h stands for British Thermal Units per hour, a rate-of-energy-transfer unit used widely in HVAC and heating systems. 1 BTU/h = 0.29307 W, so 1 kW ≈ 3,412 BTU/h. This Power Unit Converter handles BTU/h alongside W, kW, hp, and PS so you can compare air conditioner ratings across regions without manual calculation.
Joule per second (J/s) is the SI definition of the watt — 1 W = 1 J/s exactly. Physics textbooks and engineering derivations often express power as J/s when working from first principles. Including J/s in this Power Unit Converter lets students and researchers verify their derivations against real-world unit equivalents without an extra conversion step.
Yes. All conversion factors are based on internationally accepted definitions: 1 hp = 550 ft·lbf/s (= 745.69987 W), 1 PS = 75 kgf·m/s (= 735.49875 W), 1 BTU/h = 1055.05585 J / 3600 s (= 0.29307107 W). Calculations run with full floating-point precision in your browser, making this Power Unit Converter suitable for academic, engineering, and professional applications.
Free, instant, and private — the only Power Unit Converter you'll ever need.