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# Torque or Moment of Force - Online Converter

Torque or moment - the tendency of a force to rotate an object around an axis or a point - is defined as

• the product of the force and the distance from the point or axis to the force vector

Torque can be expressed as

T = F a                               (1)

where

T = moment - or torque of the force (Nm, lbf ft)

F = applied force (N, lbf)

a = moment arm (m, ft)

### Example - Torque exerted by a Wrench

A force of 250 N is acting at the end of a 30 cm long wrench. The torque exerted can be calculated as

T = (250 N) (30 cm) (0.01 cm/m)

= 75 Nm

### Moment Converter

The calculator below can be used to convert between some common moment or torque units

### Law of Lever

The Law of Lever is a torque balance on a stationary object and can be expressed as

F1 / F2 = L2 / L1                                         (2)

where

F = force (N, lbf)

L = distance from the point (1 or 2) to the force vector (m, ft)

(1) can be transformed to

F1 L1 = F2 L2                                       (2b)

or

T1 = T2                                           (2c)

#### Example - Lever

A person with a mass of 90 kg is standing on one side of a lever 2 m from the balance point. The force on the other side of lever 0.5 m from the balance point can be calculated by modifying (2) to

F2 = F1 L1 / L2

= (90 kg) (9.81 m/s2) (2 m) / (0.5 m)

= 3531 N

## Related Topics

### • Mechanics

Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.

## Related Documents

### Center Mass

Calculate position of center mass.

### Center of Gravity and Buoyancy

Stability - the center of gravity vs. the center of buoyancy.

### Centrifugal Pumps - Speed Torque Curve

The characteristic speed torque curves for centrifugal pumps.

### Centripetal and Centrifugal Acceleration Force

Forces due to circular motion and centripetal / centrifugal acceleration.

### Drawbridge - Force and Moment vs. Elevation

Calculate the acting forces and moments when elevating drawbridges or beams.

### Electric Motors - IEC and NEMA Standard Torques

IEC and NEMA torque classifications of electrical motors.

### Electric Motors - Torque vs. Power and Speed

Electric motor output power and torque vs. rotation speed.

### Equilibrant Force

The force required to keep a system of forces in equilibrium.

### Fan Motors - Starting Torques

The motor must be capable of accelerating the fan wheel to it's operating speed.

### Improvised Torque Wrench

Improvise a torque wrench with a luggage scale.

### Levers

Use levers to magnify forces.

### Lifting Wheels

Loads and effort force with lifting wheels.

### Reduced Torque with Lubricated Bolts

Lubrication effect on bolt tension and torque.

### Support Reactions - Equilibrium

Static equilibrium is achieved when the resultant force and resultant moment equals to zero.

### Torque - Work done and Power Transmitted

The work done and power transmitted by a constant torque.

Online vector calculator - add vectors with different magnitude and direction - like forces, velocities and more.

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