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Category: unit conversion constants
Reference Dataset
Metric to Imperial Standard Conversion Constants Table
Exact scaling factors for length, mass, torque, pressure, and temperature conversions.
Overview & Scope
Unit conversion factors convert measurements between Metric (SI) and Imperial systems. Accurate conversion coefficients are critical to prevent cumulative rounding errors.
Technical Sizing Values
The table below specifies exact conversion scaling coefficients and equations for standard dimensions.
| Measurement Type | From Unit | To Unit | Multiply By Factor | Formula (if non-linear) |
|---|---|---|---|---|
| Length | mm | in | 0.0393700787 | — |
| Length | in | mm | 25.4 | — |
| Mass | kg | lb | 2.20462262 | — |
| Torque | N·m | in·lb | 8.85074579 | — |
| Pressure / Stress | MPa | psi | 145.037738 | — |
| Temperature | °C | °F | 1.8 | (°C * 1.8) + 32 |
| Temperature | °F | °C | 0.55555556 | (°F - 32) / 1.8 |
Engineering Notes & Best Practices
- •Exact scaling coefficients (e.g. 25.4 mm/in) are defined by international standards.
- •Temperature conversions are non-linear due to offset differences between Celsius and Fahrenheit.
- •Pressure stress conversion factor (approx. 145.038 psi/MPa) handles high-tensile material limits.
Dataset Citations & References
NIST Special Publication 811 Guide for the Use of the International System of Units
Public domain source and standard catalog reference parameters.