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Torque. Power.
Connected by RPM.

Torque describes a turning effort. Power describes how quickly that effort transfers energy. Explore the relationship, one point or one curve at a time.

LOCAL CALCULATIONS · No upload, analytics or saved inputs on this page. Reloading or leaving clears your work.

01 / A single operating point

Point calculator

Calculation direction

Use nonnegative dot decimals or e notation, without grouping or unit suffixes. RPM: 0–100,000; torque: up to 1,000,000 Nm; power: up to 20,000,000 kW. These are tool capacity limits. Unit changes convert the entered quantity; invalid values keep their current unit.

Enter a point and calculate to see the result.

02 / Follow the relationship

Curve exploration

Paste or edit 2–200 points: RPM then torque. Use consistent comma, semicolon or tab separators, dot decimals and optionally an RPM,Torque header. RPM must increase strictly; duplicates and incomplete rows are rejected. No automatic sorting or overwriting. Maximum 32,000 characters / 1,000 lines.

Why the peaks can differ

Power equals torque multiplied by angular speed. As RPM rises, power can keep rising even after torque starts falling. Peak torque RPM can therefore differ from peak power RPM; the supplied samples determine what this explorer reports.

The units matter

P(W) = torque(Nm) × RPM × 2π / 60. One mechanical hp is approximately 745.699872 W; metric PS is a different unit and is not supported. Nm/lb-ft and kW/hp conversions preserve the quantity. Display values are rounded; calculations use the SI relationship.

The familiar 5252 RPM numerical equality applies only to lb-ft and mechanical hp. Separate plot scales here show no physical crossover. Unit conversion does not equate wheel, flywheel, net or gross ratings.

Samples, not a performance prediction

Peaks come only from supplied points. Lines between markers are visual guides, not measured or predicted values between samples. A synthetic or arbitrary curve describes no actual engine capability. This tool provides no tuning advice, diagnosis or real-engine guarantees.

Follow the engineering into the stories

Connect the numbers with airflow, engine speed and the choices that shape power delivery. These articles provide context; the explorer’s synthetic sample represents none of their engines.

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