Torque Ratio Calculator

Calculate the torque ratio to determine the mechanical advantage of a system. Enter any two values (input torque, output torque, or torque ratio) to calculate the third. Supports metric (Nm), imperial (lb-ft), kgf-m, and oz.in units.

Nm
Nm
Standard
Step by Step
Chart

Result

Detailed Steps

Torque Comparison

Formula

Torque Ratio Calculation

The torque ratio (TR) is calculated as:

TR = OT ÷ IT

Where:

  • TR = Torque Ratio (dimensionless)
  • OT = Output Torque (Nm, lb-ft, kgf-m, or oz.in)
  • IT = Input Torque (Nm, lb-ft, kgf-m, or oz.in)

Notes:

  • Metric units: Nm or kgf-m for torque.
  • Imperial units: lb-ft or oz.in for torque.
  • Enter any two values to calculate the third.
  • Conversions: 1 kgf-m = 9.80665 Nm, 1 oz.in = 0.00706155 Nm, 1 lb-ft = 1.355818 Nm.

How to Use the Torque Ratio Calculator

  1. Select the unit system (Metric, Imperial, kgf-m, or oz.in).
  2. Enter any two of the following: input torque, output torque, or torque ratio.
  3. Select your preferred display mode (Standard, Step by Step, or Chart).
  4. Click the “Calculate” button.
  5. View the results, including the calculated value and a bar chart comparing input and output torques.

Frequently Asked Questions (FAQs)

What is a Torque Ratio?

The torque ratio measures the mechanical advantage in a system, such as a gearbox or lever system, by comparing output torque to input torque. A ratio greater than 1 indicates torque amplification.

How is torque ratio used in engineering?

Torque ratio is used to design systems like transmissions or pulleys, where force amplification is needed to achieve desired performance, such as in vehicles or machinery.

What units are used for torque?

Torque is measured in Newton-meters (Nm), kilogram-force meters (kgf-m), pound-feet (lb-ft), or ounce-inches (oz.in). This calculator supports all these units.

What does a torque ratio less than 1 mean?

A torque ratio less than 1 indicates that the output torque is less than the input torque, often used in systems requiring higher speed rather than force.

Can I calculate any variable with this calculator?

Yes, enter any two of input torque, output torque, or torque ratio, and the calculator will compute the missing variable.