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Published: June 2026•By Web Util Slyce Team•10 min read
Unit Conversions — Complete Reference
A comprehensive reference for converting between metric and imperial units. Convert any value instantly with our Unit Converter tool.
Length
Base unit: Meter (m)
| From | Equals |
|---|---|
| 1 kilometer (km) | 1,000 m |
| 1 meter (m) | 100 cm / 1,000 mm |
| 1 centimeter (cm) | 10 mm / 0.01 m |
| 1 millimeter (mm) | 0.1 cm / 0.001 m |
| 1 mile (mi) | 1,609.34 m / 1.609 km |
| 1 yard (yd) | 0.9144 m / 3 ft |
| 1 foot (ft) | 0.3048 m / 12 in |
| 1 inch (in) | 2.54 cm / 25.4 mm |
| 1 nautical mile | 1,852 m / 1.852 km |
Weight / Mass
Base unit: Kilogram (kg)
| From | Equals |
|---|---|
| 1 metric ton (t) | 1,000 kg |
| 1 kilogram (kg) | 1,000 g / 2.205 lb |
| 1 gram (g) | 1,000 mg / 0.001 kg |
| 1 milligram (mg) | 0.001 g |
| 1 pound (lb) | 0.454 kg / 16 oz |
| 1 ounce (oz) | 28.35 g / 0.0625 lb |
| 1 stone (st) | 6.35 kg / 14 lb |
Temperature
Base unit: Celsius (°C)
| From | Equals |
|---|---|
| Celsius to Fahrenheit | °F = (°C × 9/5) + 32 |
| Fahrenheit to Celsius | °C = (°F − 32) × 5/9 |
| Celsius to Kelvin | K = °C + 273.15 |
| Kelvin to Celsius | °C = K − 273.15 |
| 0°C (Freezing) | 32°F / 273.15 K |
| 100°C (Boiling) | 212°F / 373.15 K |
| −40°C | −40°F (same!) |
Volume
Base unit: Liter (L)
| From | Equals |
|---|---|
| 1 liter (L) | 1,000 mL / 0.264 gal |
| 1 milliliter (mL) | 0.001 L / 1 cm³ |
| 1 cubic meter (m³) | 1,000 L / 264.17 gal |
| 1 US gallon (gal) | 3.785 L / 128 fl oz |
| 1 US quart (qt) | 0.946 L / 32 fl oz |
| 1 US cup | 236.6 mL / 8 fl oz |
| 1 US fluid ounce (fl oz) | 29.57 mL |
| 1 imperial gallon | 4.546 L |
Area
Base unit: Square meter (m²)
| From | Equals |
|---|---|
| 1 square kilometer (km²) | 1,000,000 m² / 0.386 mi² |
| 1 hectare (ha) | 10,000 m² / 2.471 acres |
| 1 acre | 4,047 m² / 0.405 ha |
| 1 square mile (mi²) | 2.590 km² / 640 acres |
| 1 square foot (ft²) | 0.093 m² / 144 in² |
| 1 square inch (in²) | 6.452 cm² |
Speed
Base unit: km/h
| From | Equals |
|---|---|
| 1 km/h | 0.621 mph / 0.278 m/s |
| 1 mph | 1.609 km/h / 0.447 m/s |
| 1 m/s | 3.6 km/h / 2.237 mph |
| 1 knot | 1.852 km/h / 1.151 mph |
Time
Base unit: Seconds (s)
| From | Equals |
|---|---|
| 1 minute (min) | 60 s |
| 1 hour (hr) | 60 min / 3,600 s |
| 1 day | 24 hr / 1,440 min / 86,400 s |
| 1 week | 7 days / 168 hr |
| 1 month (avg) | 30.44 days / 730 hr |
| 1 year (common) | 365 days / 8,760 hr |
| 1 decade | 10 years / 3,652 days |
Quick Conversion Formulas
km → miles
mi = km × 0.6214miles → km
km = mi × 1.609kg → lbs
lb = kg × 2.205lbs → kg
kg = lb ÷ 2.205°C → °F
°F = (°C × 9/5) + 32°F → °C
°C = (°F − 32) × 5/9L → gal
gal = L ÷ 3.785gal → L
L = gal × 3.785