Unit Converter Tools Guide: Master Length, Weight, Volume, and More
Whether you are following a European recipe in an American kitchen, calculating material quantities for a construction project, or interpreting scientific data in unfamiliar units, unit conversion is a skill you use more often than you realize. This guide provides reference charts, conversion formulas, and mental math shortcuts for every category of measurement, along with tools that handle the math instantly.
February 23, 2026
13 min read
Utility
Length Conversions
| From | To | Multiply By |
|---|---|---|
| Inches | Centimeters | 2.54 |
| Feet | Meters | 0.3048 |
| Yards | Meters | 0.9144 |
| Miles | Kilometers | 1.609 |
| Meters | Feet | 3.281 |
| Kilometers | Miles | 0.621 |
Mental math tip: Miles to km — multiply by 1.6. Km to miles — multiply by 0.6. Or use consecutive Fibonacci numbers (5 miles ≈ 8 km, 8 miles ≈ 13 km).
Weight Conversions
| From | To | Multiply By |
|---|---|---|
| Ounces | Grams | 28.35 |
| Pounds | Kilograms | 0.4536 |
| Stones | Kilograms | 6.35 |
| Kilograms | Pounds | 2.205 |
| Grams | Ounces | 0.03527 |
| Metric tons | Short tons | 1.102 |
Volume Conversions
| From | To | Multiply By |
|---|---|---|
| Teaspoons | Milliliters | 4.929 |
| Tablespoons | Milliliters | 14.787 |
| Cups (US) | Milliliters | 236.6 |
| Pints (US) | Liters | 0.4732 |
| Gallons (US) | Liters | 3.785 |
| Liters | Gallons (US) | 0.2642 |
| Fl ounces (US) | Milliliters | 29.57 |
US vs UK: US cups, pints, quarts, and gallons are different sizes from Imperial (UK) units. A US gallon is 3.785L; an Imperial gallon is 4.546L. Always check which system your recipe or specification uses.
Temperature Conversions
- Fahrenheit to Celsius: (°F − 32) × 5/9 = °C
- Celsius to Fahrenheit: (°C × 9/5) + 32 = °F
- Celsius to Kelvin: °C + 273.15 = K
Quick reference: 0°C = 32°F (freezing), 20°C = 68°F (room temp), 37°C = 98.6°F (body), 100°C = 212°F (boiling)
Data Storage Conversions
| Unit | Equals | In Bytes |
|---|---|---|
| 1 Kilobyte (KB) | 1,024 bytes | 1,024 |
| 1 Megabyte (MB) | 1,024 KB | 1,048,576 |
| 1 Gigabyte (GB) | 1,024 MB | 1,073,741,824 |
| 1 Terabyte (TB) | 1,024 GB | 1,099,511,627,776 |
Free Converter Tools
Online Converters:
- Temperature Converter — °F, °C, K
- Speed Converter — mph, km/h, m/s, knots
- Percentage Calculator — Quick math
- Scientific Calculator — Advanced calculations
- Hex to Decimal Converter — Number systems
- Timestamp Converter — Date/time conversions
Frequently Asked Questions
Key multipliers: km × 0.6 = miles, kg × 2.2 = lbs, liters × 0.26 = gallons, cm × 0.4 = inches. See reference charts above.
US uses customary units from pre-independence English units. UK uses metric officially but imperial informally. Only 3 countries haven't officially adopted metric.
Fluid ounces measure volume (29.57 ml). Weight ounces measure mass (28.35 g). They're approximately equal for water but differ for other substances.
(°F - 32) × 5/9. Quick: subtract 30, divide by 2 for rough estimate. Key points: 32°F=0°C, 72°F=22°C, 212°F=100°C.
Converters
- Temperature
- Speed
- Timestamp
- Hex/Decimal
Related Guides
- Measurement Guide
- Precision Guide
- Calculator Guide