Horsepower Quick Tools & Reference Lookups
HP unit converters, a side-by-side vehicle comparison tool, induction HP estimator, motor HP calculator, and a complete printable formula reference — all free, all instant.
-
HP Unit ConverterConvert between Mechanical, Metric/PS, Electric, Boiler & Water horsepower units instantly.Convert →
-
Motor Horsepower CalculatorCalculate motor HP from torque & RPM or from electrical input (single & three-phase).Calculate →
-
Horsepower Formulas Reference SheetComplete, printable reference of every HP formula organized by category. Bookmark it.View →
About These Quick Tools
The Quick Tools section collects the handy horsepower utilities that don't belong to one specific category. The HP unit converter translates between mechanical, metric (PS), electric, boiler and water horsepower in one step — useful whenever you compare a US engine spec with a European PS figure. The motor horsepower calculator finds power from either mechanical inputs (torque and RPM) or electrical inputs (volts, amps, efficiency and power factor). And the horsepower formulas reference puts every equation we use on a single printable page.
If you know exactly which calculation you need, the horsepower calculators hub and the power conversions hub cover the most common engine and unit calculations in more depth.
These utilities use exact published constants and standard formulas. Conversions are exact; performance estimates depend on the values you enter.
Frequently Asked Questions
Quick Tools gathers small, focused horsepower utilities that don't fit a single category — a horsepower unit converter, a general motor horsepower calculator, and a printable formula reference sheet.
Mechanical horsepower (1 HP = 745.7 W) is the US/UK standard. Metric horsepower or PS (1 PS = 735.5 W) is used in Europe and is slightly smaller. Electric horsepower (1 HP = 746 W) is used for motors in North America. Our HP unit converter handles all of them.
Use the Motor Horsepower Calculator. It works from torque and RPM for mechanical drives, or from voltage, current, efficiency and power factor for electric motors on single- or three-phase supplies.
Yes. Every calculator on calchorsepower.com is completely free, requires no sign-up, and runs entirely in your browser — the numbers you enter are never sent to a server.
The Horsepower Formulas Reference Sheet lists every equation we use — core HP, unit conversions, racing formulas and industrial formulas — each linked to its matching calculator.