Newton Meter Calculator

Classical Mechanics & Rotational Dynamics

Torque (also called moment of force) represents the rotational equivalent of linear force. It is defined as the cross product of the position vector and force vector: τ = r × F.

Core Torque Unit Conversion Factors

• 1 N·m = 0.737562149 lb-ft (Foot-Pounds)

• 1 N·m = 8.85074579 lb-in (Inch-Pounds)

• 1 N·m = 0.10197162 kg·m (Kilogram-Meters)

• 1 N·m = 10,000,000 dyn·cm (Dyne-Centimeters)

• 1 N·m = 1.00000000 Joule

Torque vs Engine Horsepower Relationship

In internal combustion engines and electric motors, output power is calculated from torque and rotational speed (RPM):

• Power in Horsepower: HP = Torque (lb-ft) × RPM5252

• Power in Kilowatts: kW = Torque (N·m) × RPM9549

Industrial Mechanical Engineering & Fastener Preload

Proper tightening torque induces tens of thousands of pounds of bolt tension preload, securing critical flanged joints in high-pressure oil pipelines and structural turbine housings.

How to Use This Calculator

Enter your Torque / Work Value (e.g. 150 in N·m). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Formula Reference: Newton Meter Calculator

Input variables:

torqueNewtonMetersNm — Torque / Work Value

Computed outputs:

poundFeetLbFt — Foot-Pounds (Pound-Feet)

poundInchesLbIn — Inch-Pounds (Pound-Inches)

kilogramMetersKgM — Kilogram-Meters

joulesEnergy — Energy Equivalent

Mathematical relationships extracted from calculation logic:

lbFt = nm * 0.737562149

lbIn = nm * 8.85074579

kgM = nm * 0.10197162

joules = nm * 1.0

Standard: NIST / ISO mathematical definitions

Worked Example

Setting a torque wrench for a 150 N·m wheel lug nut specification: Converts to 110.63 lb-ft, 1,327.61 lb-in, 15.296 kg-m, and 150.00 Joules of energy.

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.