📖 Overview
Enter a value and type 1 for cm to inches 2 for kg to lbs 3 for Celsius to Fahrenheit or 4 for km to miles.
⚙️ How It Works
Converts a value between four of the most commonly needed unit pairs using a conversion type code. Type 1 = cm to inches/feet, 2 = kg to pounds/ounces, 3 = Celsius to Fahrenheit/Kelvin, 4 = km to miles.
The Formula
cm→in: ÷ 2.54 | kg→lb: × 2.20462 | °C→°F: × 9/5 + 32 | km→mi: × 0.621371
| Type 1 | cm ÷ 2.54 = inches | cm ÷ 30.48 = feet |
| Type 2 | kg × 2.20462 = pounds | kg × 35.274 = ounces |
| Type 3 | (°C × 9/5) + 32 = °F | °C + 273.15 = Kelvin |
| Type 4 | km × 0.621371 = miles |
Quick Reference
| Value | Inches | Feet | Meters |
|---|---|---|---|
| 30 cm | 11.81 in | 0.98 ft | 0.30 m |
| 60 cm | 23.62 in | 1.97 ft | 0.60 m |
| 100 cm | 39.37 in | 3.28 ft | 1.00 m |
| 180 cm | 70.87 in | 5.91 ft | 1.80 m |
Practical Tips
💡 Type 3 (temperature): 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temperature).
💡 Type 2 (weight): a rough mental shortcut is 1 kg ≈ 2.2 lb.
💡 Type 4 (distance): 1 mile ≈ 1.61 km, so 5 km ≈ 3.1 miles.
Frequently Asked Questions
❓ Can I convert in the reverse direction?
Yes — enter the target value and pick the appropriate type. For example, 1 inch = 2.54 cm, so enter 2.54 with type 1 to confirm.
❓ Why not more unit types?
These four cover the vast majority of everyday conversions. More specialised conversions (fluid oz, stone, etc.) are better served by dedicated tools.