Top 10 Unit Conversions Everyone Should Know
Whether you're traveling, cooking, or just going about your day, these 10 conversions come up again and again. Master them and you'll never be stuck wondering how much that is in familiar units!
1. Kilometers to Miles
Essential for driving abroad or understanding international distances.
Quick trick: Multiply km by 0.6 for a quick estimate.
100 km ≈ 60 miles
2. Celsius to Fahrenheit
Weather reports, cooking, and fever checking.
Quick trick: Double and add 30 for an estimate.
25°C → 50 + 30 = 80°F (actual: 77°F)
3. Kilograms to Pounds
Body weight, luggage, and groceries.
Quick trick: Double the kg and add 10%.
70 kg → 140 + 14 = 154 lbs
4. Cups to Milliliters
Following recipes from different countries.
Quick reference:
¼ cup = 60 ml | ½ cup = 120 ml | 1 cup = 240 ml
5. Feet to Meters
Height measurements and room dimensions.
Quick trick: Divide feet by 3 for meters.
6 feet ≈ 2 meters (actual: 1.83m)
6. Ounces to Grams
Cooking, baking, and product weights.
Quick trick: Multiply ounces by 30 for a close estimate.
4 oz → 4 × 30 = 120g (actual: 113g)
7. Gallons to Liters
Fuel economy and liquid volumes.
Quick trick: Multiply gallons by 4 and subtract a bit.
10 gallons ≈ 38 liters
8. Inches to Centimeters
Screen sizes, paper sizes, and measurements.
Quick trick: Multiply inches by 2.5.
12 inches = 30 cm
9. Tablespoons to Teaspoons
Cooking and medicine dosages.
Also useful:
1 tbsp = 15 ml | 1 tsp = 5 ml
10. MPH to KM/H
Speed limits and vehicle speeds.
Quick reference:
30 mph = 48 km/h | 60 mph = 97 km/h | 70 mph = 113 km/h
Cheat Sheet
| Conversion | Formula | Quick Estimate |
|---|---|---|
| km → miles | × 0.621 | × 0.6 |
| °C → °F | × 1.8 + 32 | × 2 + 30 |
| kg → lbs | × 2.205 | × 2.2 |
| cups → ml | × 237 | × 240 |
| feet → meters | × 0.3048 | ÷ 3 |
| oz → grams | × 28.35 | × 30 |
| gallons → liters | × 3.785 | × 4 |
| inches → cm | × 2.54 | × 2.5 |
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