Fast conversions for length, weight, volume, and temperature—plus a quick tip for head math.
Metric vs. US Units: Quick Reference
Length
• 1 inch = 2.54 cm • 1 foot = 0.3048 m • 1 mile = 1.609 km
Weight
• 1 lb = 0.4536 kg • 1 oz = 28.35 g
Volume
• 1 US cup = 236.6 ml • 1 US pint = 473 ml • 1 US gallon = 3.785 L
Temperature
• °F → °C: (°F − 32) × 5/9
• °C → °F: (°C × 9/5) + 32
Head-math tip
• Kilograms × 2.2 ≈ pounds
• Miles × 1.6 ≈ kilometers
Need exact values? Use our Measurement Converter (length, weight, volume, temperature and more).
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