Torque converter
Convert one value or process a complete torque list.
Formula used
Foot-pounds to newton-metres: N·m = ft·lbf × 1.3558179483314
Newton-metres to foot-pounds: ft·lbf = N·m ÷ 1.3558179483314
The full conversion factor is applied before the displayed result is rounded.
How to use this calculator
- Select the required conversion direction.
- Choose single-value or batch mode.
- Enter torque values and select precision.
- Enable optional number formatting.
- Calculate, copy, download CSV, or print the result.
Example data table
| Foot-pounds (ft·lbf) | Newton-metres (N·m) |
|---|---|
| 1.00 | 1.3558 |
| 5.00 | 6.7791 |
| 10.00 | 13.5582 |
| 25.00 | 33.8954 |
| 50.00 | 67.7909 |
| 75.00 | 101.6863 |
| 100.00 | 135.5818 |
| 150.00 | 203.3727 |
| 250.00 | 338.9545 |
| 500.00 | 677.9090 |
Understanding torque conversion
Foot-pounds and newton-metres measure torque in different unit systems. Foot-pounds appear often in American automotive and mechanical specifications. Newton-metres are the standard SI measurement for rotational force.
Torque describes the turning effect produced around an axis. It combines applied force with perpendicular distance from that axis. Greater torque usually creates a stronger tendency to rotate.
One foot-pound force equals approximately 1.3558179483314 newton-metres. Reverse conversion divides newton-metres by the same precise factor. This calculator rounds only after completing the internal calculation.
Automotive manuals may show ft-lb, lb-ft, or ft·lbf. These notations commonly identify the same torque measurement in practice. Always follow the notation and instructions supplied by manufacturers.
Negative torque values can represent the opposite rotational direction. Zero remains zero after conversion in either direction. Decimal values support calibrated tools and detailed engineering records.
Batch mode converts several fastener or shaft readings together. It also reports count, minimum, maximum, average, and total. CSV output supports spreadsheets, reports, and further quality analysis.
Precision controls how many decimals appear in each result. More digits help when comparing close measurements or calibration data. Fewer digits can improve readability for routine workshop use.
Scientific notation handles extremely large or extremely small numbers. Thousands separators make large torque figures easier to scan. These display options never alter the actual conversion formula.
Torque and energy sometimes use dimensionally similar unit names. Their meanings remain different because their physical contexts differ. Fastener and engine specifications normally describe torque, not energy.
Conversion cannot replace approved tightening procedures or calibrated equipment. Lubrication, threads, temperature, and tool condition can affect tightening. Use authoritative specifications for safety-critical engineering and maintenance tasks.
Frequently asked questions
How many newton-metres equal one foot-pound?
One foot-pound force equals approximately 1.3558179483314 newton-metres.
How do I convert ft-lb to N·m?
Multiply the foot-pound value by 1.3558179483314.
How do I convert N·m to ft-lb?
Divide the newton-metre value by 1.3558179483314.
Are ft-lb and lb-ft identical for torque?
They are commonly used interchangeably in practical torque specifications.
Can I enter negative values?
Yes. Negative torque may indicate rotation in the opposite direction.
Can I convert several values together?
Yes. Batch mode accepts separate lines or semicolon-separated entries.
Does rounding reduce calculation accuracy?
No. The precise factor is applied before display rounding occurs.
Can inputs contain commas?
Yes. Values such as 1,250 are normalized before calculation.
When is scientific notation used?
It appears for exceptionally large or small values when enabled.
How does PDF export work?
The print dialog lets you select the browser’s Save as PDF option.
Is torque the same as energy?
No. They can share similar units but describe different physical concepts.