engineering Calculator

Torque Calculator

Calculate rotational torque from applied force and lever moment arm distance, or from motor power and RPM.

Audited by UniqCalc Methodology Team • Formula Checked • Free & No Registration Required

Verified Mathematical Model & Formulation

Torque (τ) = Force (F) × Radius (r) × sin(θ)
From Power: Torque (lb-ft) = (5,252 × HP) / RPM

Calculates the moment of force producing rotational acceleration about an axis based on the perpendicular lever distance from the fulcrum.

Configurable Parameters & Standard Units

  • Applied Force (lbs): (Default: 50 lb)
  • Lever Arm Length (Feet): (Default: 2 ft)

Standard Worked Example & Practical Verification

Scenario: Applying 60 lbs of pull force on a 1.5-foot torque wrench handle.

Calculated Solution
90 lb-ft (122.0 N·m or 1,080 in-lb)

Practical Takeaway: Lengthening the lever arm allows producing greater torque with less operator physical exertion.

Frequently Asked Questions

What is the conversion between lb-ft and N·m?

1 lb-ft equals approximately 1.35582 Newton-meters (N·m). 1 N·m equals approximately 0.73756 lb-ft.