Calculator Inputs
Plotly Graph
Example Data Table
| Case | Force (N) | Length (m) | Torque (N·m) | Torque (lb·ft) |
|---|---|---|---|---|
| 1 | 50.00 | 0.20 | 10.00 | 7.38 |
| 2 | 75.00 | 0.25 | 18.75 | 13.83 |
| 3 | 100.00 | 0.30 | 30.00 | 22.13 |
| 4 | 125.00 | 0.35 | 43.75 | 32.27 |
| 5 | 150.00 | 0.40 | 60.00 | 44.25 |
Formula Used
Base torque relation: T = F × L × sin(θ)
For this calculator, the angle is fixed at 90°. Therefore, sin(90°) = 1, so the equation becomes T = F × L.
- T = torque
- F = applied force
- L = perpendicular lever arm length
- θ = included angle between force and lever arm
Required force: F = T / L
Required length: L = T / F
Optional power check: P = T × 2π × RPM / 60
90° crowfoot reference: when the adapter sits exactly 90° to the wrench, the effective correction factor is 1.00.
How to Use This Calculator
- Select the calculation mode that matches your engineering task.
- Enter force and lever length for direct torque output.
- Enter target torque and lever length to find force.
- Enter target torque and force to find required length.
- Choose the proper force, length, and torque units.
- Add RPM only when you want a power estimate.
- Click calculate to show the result above this form.
- Use the CSV or PDF buttons to save summaries.
Frequently Asked Questions
1. What does 90 degree torque mean?
It means the applied force acts perpendicular to the lever arm. At that angle, the sine term becomes 1, so torque equals force multiplied by effective arm length.
2. Does a 90° crowfoot change torque wrench setting?
When a crowfoot or adapter sits exactly 90° to the torque wrench, the effective length along the wrench axis does not change. The wrench setting stays equal to the desired fastener torque.
3. Which units can I use here?
You can use newtons, kilonewtons, pounds force, or kilogram force. Length accepts metric and imperial units. Torque results are also shown in several common engineering units.
4. What if the angle is not 90 degrees?
Then the simplified equation no longer applies. Use the full relation T = F × L × sin(θ). At smaller angles, the same force produces less torque.
5. Why is RPM included?
RPM does not change static torque. It lets the calculator estimate mechanical power from the same torque when the shaft or tool is rotating.
6. How should I measure lever length?
Measure from the rotation center to the point where force is applied. That perpendicular distance is the effective moment arm used in the torque equation.
7. Can this help with breaker bars?
Yes. Enter the applied force and usable bar length to estimate delivered torque. You can also reverse the problem to find the force needed for a target torque.
8. Is this a replacement for equipment torque specs?
No. Always follow manufacturer specifications, fastener grades, lubrication conditions, and calibrated tool guidance. This calculator supports estimation, planning, and quick engineering checks.