Whether you're following an international recipe that uses grams instead of cups, converting kilometers to miles for a road trip, or figuring out how many liters are in a gallon — unit conversion is something everyone needs at some point. And getting it wrong can lead to costly mistakes.
In this guide, we'll cover the most common unit conversions, provide easy formulas, and show you how to convert any measurement instantly.
Why Unit Conversion Matters
The world uses two primary measurement systems:
- Metric System (used by 95% of the world): meters, kilograms, liters, Celsius
- Imperial System (USA, Liberia, Myanmar): feet, pounds, gallons, Fahrenheit
This difference causes daily confusion for travelers, students, engineers, and anyone shopping internationally.
Essential Conversion Tables
Length
| From | To | Multiply By |
|---|---|---|
| Inches | Centimeters | 2.54 |
| Feet | Meters | 0.3048 |
| Miles | Kilometers | 1.609 |
| Yards | Meters | 0.9144 |
Weight
| From | To | Multiply By |
|---|---|---|
| Pounds (lbs) | Kilograms (kg) | 0.4536 |
| Ounces (oz) | Grams (g) | 28.35 |
| Stones | Kilograms (kg) | 6.35 |
Temperature
°F to °C: (°F - 32) × 5/9
Quick reference: 0°C = 32°F | 100°C = 212°F | 37°C = 98.6°F (body temp)
Volume
| From | To | Multiply By |
|---|---|---|
| US Gallons | Liters | 3.785 |
| Cups (US) | Milliliters | 236.6 |
| Fluid Ounces | Milliliters | 29.57 |
Real-World Conversion Examples
Cooking: Cups to Grams
An American recipe calls for 2 cups of flour. How much is that in grams?
1 cup of all-purpose flour ≈ 120g, so 2 cups = 240 grams
Travel: Miles to Kilometers
Your GPS says the destination is 100 miles away. In kilometers?
100 × 1.609 = 160.9 km
Fitness: Pounds to Kilograms
You weigh 165 pounds. In kilograms?
165 × 0.4536 = 74.8 kg
Convert Any Unit Instantly
Our Free Unit Converter handles all these conversions and more:
- ✅ Length, weight, volume, temperature, speed, area, and more
- ✅ Instant results as you type
- ✅ Metric ↔ Imperial conversions
- ✅ Mobile-friendly design
- ✅ 100% free, no signup
Related Tools
- 🏋️ BMI Calculator — uses height/weight conversions
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All tools on WebFusionTools are free and process calculations locally in your browser for instant results.
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