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Live metric converter
Any value, any unit — every equivalent shown at once.
REFERENCE TABLE · MATH · CONVERTERS
Metric Conversion Chart
One chart for the conversions real life actually asks for: 5 km is 3.11 miles, 70 kg is 154.32 lb, 25°C is 77°F. The table below covers length, weight, and volume with the exact factors — and the live lookup converts any value instantly, both directions of the common pairs. Print-friendly: the chart fits one page.
The full chart
| Metric | Equals (US) | Reverse | You meet it in |
|---|---|---|---|
| Millimeter (mm) | 0.0393701 in | Inch ÷ 25.4 | Screw sizes, rainfall |
| Centimeter (cm) | 0.393701 in | Inch ÷ 2.54 | Height, clothing, snow |
| Meter (m) | 3.28084 ft · 1.09361 yd | Foot ÷ 0.3048 | Room sizes, race distances |
| Kilometer (km) | 0.621371 mi | Mile ÷ 1.60934 | Driving, running, cycling |
| Gram (g) | 0.035274 oz | Ounce ÷ 28.3495 | Recipes, postage, nutrition labels |
| Kilogram (kg) | 2.20462 lb | Pound ÷ 0.453592 | Body weight, luggage, freight |
| Milliliter (mL) | 0.033814 fl oz | Fluid oz ÷ 29.5735 | Medicine doses, perfume |
| Liter (L) | 0.264172 gal (US) | Gallon ÷ 3.78541 | Fuel economy, aquariums, paint |
| Celsius (°C) | °F = °C × 9/5 + 32 | °C = (°F − 32) × 5/9 | Weather, ovens, fevers |
The 60-second rule
Multiply by the factor; flip it for the reverse. 5 km × 0.621371 = 3.11 miles. 70 kg × 2.20462 = 154.32 lb. Temperature is the only odd one: °F = °C × 9/5 + 32 (25°C → 77°F), because the scales start at different zeros. A handy anchor: 1 m ≈ 3 ft 3 in, 1 kg ≈ 2.2 lb, 1 L ≈ 1 quart and a sip.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Miles | km × 0.621371 | 3.10686 mi for 5 km — the road-sign number. |
| Feet | km × 3,280.84 | 16,404.2 ft for 5 km — the surveyor’s number. |
| Pounds | kg × 2.20462 | 154.32 lb for 70 kg — the scale number. |
| Fahrenheit | °C × 9/5 + 32 | 77°F for 25°C — the weather number. |
Who uses this
- Travelers: speed limits in km/h, distances in km, luggage in kg — translated on the spot.
- Cooks: a European recipe’s grams and milliliters against American cups and ounces.
- Runners: 5K/10K race math (a 5K is 3.11 miles) and pace conversions.
- Students: science homework lives in SI units; the chart is the allowed crib sheet.
Accuracy & limitations
The factors are exact by definition (the inch is defined as exactly 2.54 cm; the pound as exactly 0.45359237 kg), so the only error is rounding. Watch two traps: US vs imperial gallons — this chart uses the US gallon (3.78541 L); an imperial gallon is 4.54609 L, so British fuel figures need a different factor. And fluid ounces vs weight ounces: a fluid ounce measures volume, an ounce measures weight — they only match for water. Converting grams to cups depends on the ingredient’s density, which no fixed factor can do.
Cite this calculatorBright Side Kit. “Metric Conversion Chart.” brightoolbox.com, 2026.
Bright Side Kit. "Metric Conversion Chart." https://brightoolbox.com/metric-conversion-chart/ Accessed October 23, 2026.Frequently asked questions
How do I convert kilometers to miles?
Multiply by 0.621371: 5 km × 0.621371 = 3.11 miles. For a quick mental estimate, halve the kilometers and add 10% (5 → 2.5 + 0.25 ≈ 2.75 — close enough for road signs in reverse).
How do I convert kilograms to pounds?
Multiply by 2.20462: 70 kg × 2.20462 = 154.32 lb. Mental shortcut: double the kilograms and add 10% (70 → 140 + 14 = 154). The live lookup above does it exactly.
How do I convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32. 25°C × 9/5 + 32 = 77°F. Going back: °C = (°F − 32) × 5/9. Unlike the rest of the chart, temperature needs the +32 because the two scales start at different zeros.
What is a liter in gallons?
One liter is 0.264172 US gallons — so a 4-liter jug is 1.06 gallons, and 20 L is 5.28 gal. Note this is the US gallon; the imperial gallon used in the UK is bigger (4.54609 L).
How many inches is 180 cm?
180 × 0.393701 = 70.87 inches, which is 5 ft 10.9 in. Handy anchors: 150 cm ≈ 4 ft 11 in, 180 cm ≈ 5 ft 11 in, 190 cm ≈ 6 ft 3 in.
Why are there two kinds of ounces?
A fluid ounce measures volume (29.5735 mL) and an ounce measures weight (28.3495 g). They coincide only for water. Eight fluid ounces of honey weighs about 12 ounces — recipes that mix the two are why kitchen scales win.