Imperial / Metric Converter
Length, area, volume, weight, temperature and pressure
Inputs
Results
Enter a value then click Convert.
UKUK Building Regulations
References & Sources
Standards Cited
- NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
Authoritative source for all imperial-to-metric conversion factors used in this calculator View → - Weights and Measures Act 1985 — UK Weights and Measures Act 1985
Legal definitions of UK imperial units (stone, hundredweight, long ton, UK gallon, pint) and their metric equivalents
Formulas Used
- Generic Unit Conversion:
result = value x (fromFactor / toFactor)
Source: NIST SP 811 — All conversions route through an SI base unit (metres, kilograms, etc.) - Celsius to Fahrenheit:
F = (C x 9/5) + 32
Source: NIST SP 811 - Fahrenheit to Celsius:
C = (F - 32) x 5/9
Source: NIST SP 811 - Celsius to Kelvin:
K = C + 273.15
Source: SI Brochure
Key Assumptions
- 1 inch = 0.0254 m exactly — NIST Special Publication 811
- 1 UK gallon = 0.00454609 m³ (4.54609 litres) — Weights and Measures Act 1985
- 1 UK long ton = 1016.05 kg — Weights and Measures Act 1985
- 1 US gallon = 0.00378541 m³ (3.78541 litres) — NIST Special Publication 811
- 1 stone = 6.35029 kg (UK imperial) — Weights and Measures Act 1985
- Pressure conversion: 1 psi = 6894.76 Pa — NIST Special Publication 811