Power Tool Speed/Torque Converter
Calculate power, speed, torque relationship for drills and impact drivers
Calculation Mode
Choose your calculation method
Tool Type Optional
Select a tool type to load typical specifications
Electrical Parameters
Find these values on the tool label or manual
Calculation Results
Task Feasibility By required torque, ascending
Application Recommendations
Tool Performance Radar
Common Torque Requirement Lookup
| Task | Required Torque | Material / Note |
|---|---|---|
| Wood screws / Furniture assembly | ~6 Nm | Wood / General furniture assembly |
| Tighten M6 bolt | ~10 Nm | Metal / Class 8.8 dry |
| Tighten M8 bolt | ~18 Nm | Metal / Class 8.8 dry |
| Tighten M10 bolt | ~28 Nm | Metal / Class 8.8 dry |
| Tighten M12 bolt | ~41 Nm | Metal / Class 8.8 dry |
| Remove car lug nut | ~110 Nm | Steel / Passenger car spec |
About Power Tool Speed/Torque Converter
This calculator helps DIY enthusiasts and professionals understand the relationship between power tool specifications. Using the formula P = 2πNT/60, calculate power (W), speed (RPM), and torque (Nm) relationships with application recommendations. Supports Nm, kgf·cm, ft·lb torque unit conversions.
How to Use
- Select tool type (drill, impact driver, grinder, saw, or custom)
- Enter at least two known parameters: electrical (voltage, current, efficiency) or mechanical (speed, torque, power)
- System automatically calculates other parameters and displays conversions for all torque units
- Review application recommendations to determine if tool meets your job requirements
- Use radar chart to visualize tool's relative strength in speed, torque, and power
Formula Explanation
Power-torque-speed relationship formula: P = 2π × N × T / 60. Where P is power (Watts), N is speed (RPM, Revolutions Per Minute), T is torque (Newton-meters). Torque conversion: 1 Nm = 10.197 kgf·cm = 0.7376 ft·lb. Electric to mechanical power: Mechanical power = Voltage × Current × Efficiency, where efficiency is approximately 60-80%.
Use Cases
- Compare performance specs before purchasing power tools (brands like Bosch, Makita, DeWalt)
- Determine if existing tool can handle specific tasks (e.g., drilling concrete, removing lug nuts)
- Understand "high-speed low-torque" (for cutting/grinding) vs "low-speed high-torque" (for bolts) differences
- Calculate theoretical maximum torque output for battery-powered tools, assess performance
- Convert torque specs between different units for easy tool performance comparison
Important Notes
- Calculated values are theoretical maximum, actual performance affected by battery charge, load, temperature
- Manufacturer torque specs are usually peak torque, continuous torque is approximately 60-70% of peak
- RPM is usually no-load speed, actual operation speed decreases under resistance
- Efficiency values are estimates, actual efficiency varies by tool quality and motor type (brushed/brushless)
Tool Selection Guide
- Home DIY: Choose 18V drill with 30-60 Nm torque for most woodworking and assembly tasks
- Professional work: Impact driver with 100-200 Nm torque for tightening large bolts and hard materials
- Metalworking: Angle grinder with high speed (8000+ RPM) for cutting and grinding metal
- Woodcutting: Circular saw with medium speed (5000 RPM) balancing cutting speed and precision
