Fifteen categories, one converter
Each unit is stored as a factor (and, for temperature, an offset) relative to an SI base. Converting mm to inch is 0.001 m ÷ 0.0254 m; converting °C to °F uses the affine transform, not a single scale factor.
Formula
1 in = 25.4 mm
1 lb = 0.45359237 kg
1 bar = 0.1 MPa = 14.5038 PSI
1 N·m = 0.737562 lb·ft
1 hp = 0.7457 kW (mechanical)
°F = °C × 9/5 + 32
Example — 120 MPa to PSI
120 MPa = 120 × 145.0377 = 17,404.5 PSI. The same stress is 1,200 bar.
Categories included
- Length (12 units, base m)
- Area (9 units, base m²)
- Volume (9 units, base m³)
- Weight / Mass (8 units, base kg)
- Temperature (4 units, base K)
- Pressure (10 units, base Pa)
- Force (5 units, base N)
- Torque (5 units, base N·m)
- Speed (5 units, base m/s)
- Time (6 units, base s)
- Power (6 units, base W)
- Energy (8 units, base J)
- Density (4 units, base kg/m³)
- Angle (5 units, base rad)
- Frequency (5 units, base Hz)
- Data (9 units, base B)
- Flow rate (5 units, base m³/s)
Pair this with the material weight calculator when a drawing mixes millimetres and inches, or with the ISO tolerance calculator when you need micrometres from a millimetre nominal.