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Torque Conversion
Tool Description
Torque Conversion is an online torque/moment unit conversion tool that supports mutual conversion between Newton meter (N·m), kilonewton meter (kN·m), kilogram-force meter (kgf·m), gram-force centimeter (gf·cm), pound-force foot (lbf·ft), pound-force inch (lbf·in), and dyne centimeter (dyn·cm). Enter any value and unit to instantly view the corresponding results in all other units. Suitable for automotive engineering, mechanical design, physics study, aerospace, and more.
How to Use
- Enter a value
Type the torque value you want to convert, supporting integers and decimals, e.g.,
100,0.5 - Select source unit
Choose the torque unit of your value from the dropdown (N·m/
kN·m/ kgf·m/ gf·cm/ lbf·ft/ lbf·in/ dyn·cm) - View results
Click the "Convert" button or press Enter, and the result area below will display the corresponding values in all units. Each result has a copy button for convenience.
Use Cases
- Automotive Engineering: Engine torque parameters are typically labeled in N·m or lbf·ft. For example, VW models use N·m (e.g., 350 N·m) while American models use lbf·ft (e.g., 258 lbf·ft). Use this tool to quickly compare the power performance of vehicles from different countries.
- Mechanical Design: In bolt tightening torque calculations, European/American standards commonly use lbf·ft or lbf·in, while international standards use N·m. Quickly convert when translating design drawings; unit conversion in torque wrench calibration.
- Physics Study: Learning the concept of moment in mechanics, conversion practice between different unit systems (SI N·m, CGS dyn·cm, engineering kgf·m), understanding the product relationship between lever arm and force.
Core Advantages
- Daily free quota
This tool grants you free daily usage. Everyday lightweight conversions are satisfied at zero cost; for higher-frequency or professional needs, unlock more quota with a membership
- Privacy & security
All conversions run locally in your browser. Your input values are never uploaded to any server, 100% protecting your privacy
- No installation needed
No installation or registration required — open the page and use it instantly, fully compatible across desktop, mobile, and tablet
- Comprehensive unit coverage
Supports 7 torque units across the SI, CGS, and engineering systems, meeting mechanical, automotive, and academic needs
- High-precision conversion
Calculates based on precise factors (such as standard gravitational acceleration g = 9.80665) with auto-formatted results for clear reading
- One-click copy
Every result comes with a copy button. Click it to copy the value to your clipboard for easy pasting into drawings or reports
Torque Unit Conversion Relationships
The following table shows the conversion relationships between torque units, using Newton meter (N·m) as the base unit:
| Unit Name | Abbr. | Conversion Relationship | Equivalent N·m |
|---|---|---|---|
| Newton Meter | N\u00B7m | 1 N·m = 1 N·m | 1 |
| Kilonewton Meter | kN\u00B7m | 1 kN·m = 1,000 N·m | 1,000 |
| Kilogram-force Meter | kgf\u00B7m | 1 kgf·m = 9.80665 N·m | 9.80665 |
| Gram-force Centimeter | gf\u00B7cm | 1 gf·cm = 9.80665×10⁻⁵ N·m | 0.0000980665 |
| Pound-force Foot | lbf\u00B7ft | 1 lbf·ft = 1.3558179483 N·m | 1.3558179483 |
| Pound-force Inch | lbf\u00B7in | 1 lbf·in = 0.112984829 N·m | 0.112984829 |
| Dyne Centimeter | dyn\u00B7cm | 1 dyn·cm = 10⁻⁷ N·m | 0.0000001 |
Common Torque Units by Application Field
The following table lists the most common application areas and typical examples for each torque unit:
| Torque Unit | Application Field | Typical Example |
|---|---|---|
| N\u00B7m | Automotive, Mechanical Engineering | Engine peak torque, motor rated torque |
| kN\u00B7m | Heavy Machinery, Wind Power | Wind turbine main shaft torque, ship propulsion shaft |
| kgf\u00B7m | Japanese/Asian Machinery | Japanese vehicle engine torque, industrial robot joints |
| lbf\u00B7ft | US/UK Automotive | American pickup trucks, muscle car engine specs |
| lbf\u00B7in | Precision Machinery, Torque Wrench | Small torque fasteners, watch movement assembly |
Definition and Physical Meaning of Torque
Torque (or Moment) is the product of force and lever arm, representing the rotational effect of a force on an object about an axis. The formula is: τ = F × r, where F is the force and r is the lever arm (perpendicular distance from the force application point to the axis of rotation). The SI unit of torque is the Newton meter (N·m), which is the moment produced by a force of 1 Newton acting on a lever arm of 1 meter.
Torque and work/energy share the same dimensional units (force × distance), but their physical meanings are completely different: torque is a vector (with direction, determined by the right-hand rule), describing rotational effect; work/energy is a scalar, describing energy transfer. Therefore, torque is usually written as N·m (emphasizing the product of force and lever arm), while work is written as J (Joule) = N·m. In engineering, while the units of torque and work are interchangeable, the concepts should not be confused.
FAQ
1 N·m ≈ 0.10197 kgf·m, 1 kgf·m = 9.80665 N·m. Kilogram-force meter is a commonly used torque unit in engineering, based on standard gravitational acceleration g = 9.80665 m/s². For example, an engine rated at 350 N·m of torque is approximately 35.7 kgf·m. For rough estimation, you can use 1 kgf·m ≈ 10 N·m (about 2% error).
1 lbf·ft ≈ 1.356 N·m, 1 N·m ≈ 0.7376 lbf·ft. These are the two most common torque units in the automotive field. For example, the Dodge Challenger Hellcat engine torque of 650 lbf·ft ≈ 881 N·m. Conversely, the Ferrari 488's 760 N·m ≈ 560 lbf·ft. A rough memory aid: lbf·ft values are about 3/4 of N·m values.
1 lbf·ft = 12 lbf·in, 1 lbf·in = 1/12 lbf·ft ≈ 0.08333 lbf·ft. Since 1 ft = 12 in, pound-force foot is 12 times pound-force inch. lbf·ft is commonly used for engine torque, while lbf·in is used for tightening torque of small fasteners. For example, an engine producing 300 lbf·ft = 3,600 lbf·in. Torque wrenches typically come in lbf·ft and lbf·in specifications: small torques use lbf·in (e.g., 50-250 lbf·in), while large torques use lbf·ft (e.g., 20-150 lbf·ft).
1 dyn·cm = 10⁻⁷ N·m = 0.0000001 N·m. Dyne centimeter is the torque unit in the centimeter-gram-second (CGS) system of units. 1 dyn·cm represents the moment produced by a force of 1 dyne acting on a 1 cm lever arm. Due to its extremely small magnitude, it is largely obsolete in modern engineering but may still appear in some classical physics textbooks and historical literature. 1 N·m = 10,000,000 dyn·cm (10⁷ dyn·cm).
Any size is supported. From extremely small values (such as 0.0000001 N·m for dyn·cm) to extremely large ones (such as thousands of kN·m for heavy machinery), all convert normally. Results are auto-formatted with enough significant digits for easy reading.
Instant. All conversions are calculated locally in your browser in real time. Enter a value and click Convert to see results in all 7 units immediately, with no waiting for uploads or server responses.
No. All conversion calculations run entirely in your browser using pure JavaScript math. Your input data never leaves your device.
Open and use instantly, no registration required. This tool provides free daily usage for everyday lightweight conversions at zero cost. When you need higher-frequency or more professional batch conversions, a membership unlocks more quota to handle various scenarios with ease.
Yes, mobile supported. The page is responsive and works smoothly on phones, tablets, and desktops. Complete torque conversions anytime, anywhere, without installing an app.
More convenient and accurate. Compared to manually multiplying conversion factors or flipping through engineering handbook conversion tables, this tool automatically lists all 7 unit results with built-in precise factors, so you won't make mistakes from misremembering factors like 1 lbf·ft ≈ 1.356 N·m, and it also supports one-click copy.
Confusing lbf·ft and lbf·in is the most common. They differ by a factor of 12, so it's easy to mistake a small torque wrench spec for a large one. Also note that kgf·m differs from N·m by about 9.8x and N·m from dyn·cm by 10⁷x. Confirming the source unit before using this tool helps you avoid these mistakes.
This tool uses JavaScript double-precision floating-point numbers for calculations, providing sufficient accuracy for most engineering scenarios. Kilogram-force meter uses standard gravitational acceleration g = 9.80665 m/s², and pound-force uses internationally standardized conversion ratios (1 lbf = 4.4482216152605 N, 1 ft = 0.3048 m). Decimal portions are capped at 6 significant decimal places, and excessively long decimals are automatically truncated, with virtually no practical impact.
Content last updated：2026-07-16
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