Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Mechanical
Shaft Torque Calculator
Determine the minimum shaft diameter needed to safely transmit a given power at a specified speed and shear stress limit. Essential for mechanical designers sizing drive shafts, motor shafts, and spindles.
Fill in the required fields to see your result.
Mechanical
Bolt Torque Calculator
Calculates the tightening torque required to achieve a target clamp load in a bolted joint, based on bolt diameter, material strength, and friction. Use it when assembling structural or mechanical joints to avoid under- or over-tightening.
Fill in the required fields to see your result.
Key differences
| Shaft Torque Calculator | Bolt Torque Calculator | |
|---|---|---|
| Category | Mechanical | Mechanical |
| Inputs required | 4 | 4 |
| Result | Required Diameter (mm) | Required Torque (N·m) |
| What it does | Determine the minimum shaft diameter needed to safely transmit a given power at a specified speed and shear stress limit. Essential for mechanical designers sizing drive shafts, motor shafts, and spindles. | Calculates the tightening torque required to achieve a target clamp load in a bolted joint, based on bolt diameter, material strength, and friction. Use it when assembling structural or mechanical joints to avoid under- or over-tightening. |