Torque and Rotational Moment Converter

Mechanical Engineering: Torque vs. Power

Torque) measures rotational twisting force applied around a pivot axis.

The Famous 5,252 RPM Crossover Constant

In the imperial horsepower equation, Horsepower equals (Torque × RPM) / 5,

• Therefore, on every dynamometer dyno chart, the Torque curve (in lb-ft) and Horsepower curve always intersect at exactly 5,252 RPM.

How to Use This Calculator

Enter your Torque / Moment Value (e.g. 100), From Unit — choose from Newton-Meters (N·m, Base SI), Pound-Feet (lb-ft / ft·lbf), Pound-Inches (lb-in / in·lbf), To Primary Target Unit — choose from Pound-Feet (lb-ft), Newton-Meters (N·m), Pound-Inches (lb-in), and Engine / Motor Speed (RPM, for Horsepower Calculation) (e.g. 5252). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Universal torque and mechanical moment conversion ratios:-Meters to Pound-Feet: lb-ft = (N·m) / (1.355818) = N·m × 0.737562-Feet to Newton-Meters: N·m = lb-ft × 1.355818-Feet to Pound-Inches: lb-in = lb-ft × 12 from Torque & RPM: HP = (Torque (lb-ft) × RPM) / (5,252) = (Torque (N·m) × RPM) / (7,120.9)

Worked Example

For example, tightening an automotive lug nut to 100 N·m of torque: which equals 885.07 lb-in, and 10.20 kgf·m. If an engine delivers 100 N·m (73.76 lb-ft) of torque at 5,252 RPM, it produces exactly 73.76 Horsepower (55.00 kW).

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.