Torque Calculator
Calculate torque from force and distance, or convert between Nm, lb-ft, and kgf-cm. Essential for bolt tightening and machine design.
What is Torque Calculator?
This torque calculator computes rotational force from applied force and lever arm distance (τ = F × r). Also converts between torque units (Nm, lb-ft, kgf-cm, dyne-cm) and relates torque to power and angular velocity.
How to Use This Calculator
- Enter your Force, Moment Arm Length, Angle between F and arm in the input fields provided
- Results are computed instantly as you enter or modify values — no need to click a button
- Review the computed output showing your torque results with a detailed breakdown
- Use the output for preliminary design checks — critical applications require verification by a licensed professional
How Torque Calculator is Calculated
This calculator uses the formula: τ = F × r × sin(θ). Where τ = Torque (N·m) ; F = Force (N) ; r = Moment arm (m) ; θ = Angle. Maximum torque when force is perpendicular (θ=90°). Power = τ × angular velocity. All calculations run entirely in your browser — no data is transmitted to any server.
Frequently Asked Questions
What is the relationship between torque and power?
Power (W) = Torque (Nm) × Angular velocity (rad/s). Or: HP = (Torque in lb-ft × RPM) / 5,252. A motor producing 100 Nm at 3,000 RPM delivers: 100 × (3000 × 2π/60) = 31,416 W ≈ 31.4 kW.
How much torque to tighten common bolts?
M6: 8–10 Nm. M8: 20–25 Nm. M10: 40–50 Nm. M12: 70–85 Nm. Car wheel lug nuts: 90–120 Nm. Always use a torque wrench for safety-critical fasteners.
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Why You Need This Calculator
Engineering calculations require precision — errors can have real-world consequences. Torque Calculator uses validated formulas from engineering standards and textbooks. Whether you are designing systems, troubleshooting problems, or studying for engineering exams, this tool provides reliable results with clear methodology. All standard units are supported with automatic conversion.
Calculator Features
- Instant Torque Calculator calculation with validated formulas
- Detailed step-by-step result breakdown
- Works offline as a Progressive Web App
- Completely free — no signup or data collection
- Mobile-friendly responsive design
- Save and share your results easily
Pro Tips & Expert Insights
- 💡 Always verify critical calculations with standard reference materials before implementation.
- 💡 Check units carefully — unit mismatches are the most common engineering error.
- 💡 For safety-critical applications, apply appropriate safety factors to calculated values.
- 💡 Understand the assumptions behind each formula — they have valid ranges of application.
- 💡 Use SI units for consistency and to avoid conversion errors.
Who Benefits From This?
Engineering students and professors, practicing engineers designing systems, technicians troubleshooting equipment, and hobbyists building projects.
📚 Complete Guide Available
Want to learn more? Read our comprehensive guide with detailed explanations, real-world examples, expert analysis, and actionable tips.
Read: TorqueEngineering disclaimer: This calculator provides preliminary estimates. All calculations for actual engineering projects must be verified by a licensed professional engineer. See our full Disclaimer.
Maintained by: Sagar Sahni, Calc Labz | Review: formula checks, worked examples, and periodic updates
Need a correction? Contact us with the calculator name, your inputs, and the issue you found.
Last updated: April 2026