The most useful conversions for daily life, cooking, travel, and more
Whether you're following a recipe from another country, checking the weather while traveling, or trying to understand your fitness tracker's data, unit conversions come up constantly. Yet most of us can only confidently convert a handful of units from memory.
This guide covers the conversions you'll actually use in daily life — no physics equations required. Each section includes the conversion factor, a quick mental math trick, and a link to our free calculator for precise results.
| From | To | Multiply By | Quick Trick |
|---|---|---|---|
| Miles → Kilometers | km | 1.609 | ×1.6 (about ⅔ more) |
| Kilometers → Miles | mi | 0.621 | ×0.6 (a bit more than half) |
| Feet → Meters | m | 0.305 | ÷3 (roughly) |
| Meters → Feet | ft | 3.281 | ×3 (roughly) |
| Inches → Centimeters | cm | 2.54 | ×2.5 |
| Centimeters → Inches | in | 0.394 | ÷2.5 or ×0.4 |
| Yards → Meters | m | 0.914 | Almost 1:1 |
Use our Length Converter for precise conversions between any units.
| From | To | Multiply By | Quick Trick |
|---|---|---|---|
| Pounds → Kilograms | kg | 0.454 | ÷2.2 or roughly ÷2 then ×0.9 |
| Kilograms → Pounds | lb | 2.205 | ×2 then add 10% |
| Ounces → Grams | g | 28.35 | ×28 (about 30) |
| Grams → Ounces | oz | 0.0353 | ÷28 or ×0.035 |
| Stones → Kilograms | kg | 6.35 | ×6.35 |
| Stones → Pounds | lb | 14 | ×14 |
The kilogram-to-pound conversion is especially useful for tracking body weight across different measurement systems. Use our Weight Converter for instant results.
| Direction | Formula | Example |
|---|---|---|
| °F → °C | (°F − 32) × 5 ÷ 9 | 72°F = 22.2°C |
| °C → °F | (°C × 9 ÷ 5) + 32 | 20°C = 68°F |
| °C → K | °C + 273.15 | 0°C = 273.15 K |
| K → °C | K − 273.15 | 300 K = 26.85°C |
| Description | °F | °C |
|---|---|---|
| Water freezes | 32°F | 0°C |
| Room temperature | 68–72°F | 20–22°C |
| Body temperature | 98.6°F | 37°C |
| Water boils | 212°F | 100°C |
| Oven: moderate | 350°F | 177°C |
| Oven: hot | 425°F | 218°C |
For quick conversions without the math, use our Temperature Converter.
| From | To | Multiply By |
|---|---|---|
| US Gallons → Liters | L | 3.785 |
| Liters → US Gallons | gal | 0.264 |
| US Cups → Milliliters | mL | 236.6 |
| UK Cups → Milliliters | mL | 250 |
| Fluid Ounces → Milliliters | mL | 29.57 |
| Tablespoons → Milliliters | mL | 14.79 |
| Teaspoons → Milliliters | mL | 4.93 |
Use our Volume Converter for precise liquid measurement conversions.
| From | To | Multiply By |
|---|---|---|
| Square Feet → Square Meters | m² | 0.0929 |
| Square Meters → Square Feet | ft² | 10.764 |
| Acres → Square Meters | m² | 4,047 |
| Acres → Hectares | ha | 0.4047 |
| Square Miles → Square Km | km² | 2.59 |
Use our Area Converter for property and land measurements.
| From | To | Multiply By |
|---|---|---|
| Miles per Hour → Km per Hour | km/h | 1.609 |
| Km per Hour → Miles per Hour | mph | 0.621 |
| Knots → Km per Hour | km/h | 1.852 |
| Meters per Second → Km per Hour | km/h | 3.6 |
| Feet per Second → Miles per Hour | mph | 0.682 |
Speed conversions are particularly useful when reading weather reports or driving in countries that use different units. Use our Speed Converter for quick calculations.
Here are the most useful conversions to memorize — the ones that come up most often in daily life: