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Unit Converter

Convert length, weight, temperature, area, volume, speed, time, power, pressure, angle, and data size instantly. Type a value once and see every equivalent in a live table. Use Focus Mode for side-by-side comparisons (kg ↔ lb, cm ↔ inches, °F ↔ °C). Currency rates load on demand. All calculations run locally in your browser.

TL;DR — type once, see every equivalent unit (plus live currency)

This free unit converter turns one input into a full table of equivalents across your chosen category—length, weight, temperature, area, volume, speed, time, power, pressure, angle, or data size. Prefer a streamlined layout? Use Focus Mode for From → To with multiple outputs. The Currency tab fetches live exchange rates on demand (Frankfurter API). Fast, precise, private, and 100% client‑side.

Unit Converter – Convert Length, Weight, Temperature & More Online Free

Convert between units instantly with a live all-units table. Enter a value in any unit and every equivalent appears at once. This free unit converter covers length, weight, temperature, area, volume, speed, time, data, and live currency rates.

Want a minimal, side‑by‑side layout? Switch to Focus Mode. Choose a single From unit, then add multiple To rows to compare results (for example, inch → cm and inch → mm in one view). You can click any row in the full table to make it the active input—the app re‑expresses your current number in that unit automatically. The input accepts comma or dot as the decimal separator, and outputs are formatted with sensible precision so you can copy results without cleanup.

Temperature conversions use the standard formulas—°F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9—and common constants are built in so quick checks stay consistent: 1 inch = 25.4 mm, 1 kg ≈ 2.20462 lb, 1 km ≈ 0.621371 mi. Because the app runs entirely in your browser, most conversions work offline; currency rates simply load on demand when you open the FX tab. No accounts, no uploads, just fast, accurate math.

Most searched unit conversions

  • kg to lbs — 1 kg = 2.20462 lb. Select the Weight category and type your value.
  • cm to inches — 1 cm = 0.393701 in. Great for clothing sizes and display specs.
  • miles to km — 1 mile = 1.60934 km. Select Length and enter your mileage.
  • Celsius to Fahrenheit — °F = °C × 9/5 + 32. Use the Temperature category.
  • meters to feet — 1 m = 3.28084 ft. The full table shows feet, inches, and more at once.
  • mm to inches — 1 mm = 0.0393701 in. Useful for hardware specs and engineering.

Tip: use Focus Mode to compare two or more units side-by-side — for example, meters alongside both feet and inches in a single view.

How to use this converter

  1. Pick a category: Length, Weight, Temperature, Area, Volume, Speed, Time, Power, Pressure, Angle, Data, or Currency.
  2. Enter a value next to any unit: the table instantly shows every equivalent.
  3. Focus Mode (optional): choose a From unit and add multiple To outputs for side‑by‑side comparisons.
  4. Temperature & currency: use °C/°F/K for heat; open the Currency tab to fetch live FX rates.
  5. Copy and continue: switch units anytime—the current input is converted for you.

Key features

  • Live, all‑units table per category (type once, see every equivalent instantly)
  • Focus Mode for streamlined From → To with multiple outputs
  • Temperature conversions: Celsius ↔ Fahrenheit ↔ Kelvin
  • Length favorites: cm ↔ in, mm ↔ in, km ↔ mi, ft ↔ m
  • Weight favorites: kg ↔ lb, oz ↔ g, st ↔ kg
  • Accurate Area, Volume, Speed, Time, Power, Pressure, Angle, and Data size conversions
  • Currency tab with live exchange rates (Frankfurter API) on demand
  • Decimal normalization (comma or dot), smart precision formatting
  • Fast, privacy‑friendly, 100% client‑side — no sign‑up

Tips

  • Use either comma or dot for decimals; the converter normalizes automatically.
  • Click any row in table view to make it the active input — your value is re‑expressed in that unit.
  • In Focus Mode, add multiple 'To' rows to compare units side‑by‑side (e.g., in → cm and mm).
  • Quick temperature math: °F = °C × 9/5 + 32; °C = (°F − 32) × 5/9.
  • For distance: 5 km ≈ 3.10686 mi; for weight: 10 kg ≈ 22.0462 lb.

Frequently asked questions

How many millimeters are in an inch?
Exactly 25.4 mm in 1 inch. (And 1 inch = 2.54 cm.)
What is 1 kg in pounds (kg to lbs)?
1 kilogram ≈ 2.20462 lb. Reverse: 1 lb ≈ 0.453592 kg.
How do I convert centigrade (°C) into Fahrenheit (°F)?
Use °F = °C × 9/5 + 32. Example: 20°C → 68°F. Reverse: °C = (°F − 32) × 5/9.
What’s the quick rule for kilometers to miles?
1 km ≈ 0.621371 mi; 1 mi ≈ 1.60934 km.
Are currency exchange rates live?
Yes—when you open the Currency tab, the app requests the latest available rates from the Frankfurter API. Other unit categories continue to work offline.
How do I convert meters to feet and inches online?
Select the Length category, type your value in meters, and the converter instantly shows the equivalent in feet, inches, centimeters, miles, and all other length units at once.
How do I convert kilograms to pounds online?
Select the Weight category and enter your kilogram value. The table immediately shows pounds, ounces, stone, grams, and more. 1 kg = 2.20462 lbs.
What is the formula for converting Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. For example, 98.6°F = 37°C. Enter your Fahrenheit value in the Temperature category to see Celsius, Kelvin, and more instantly.

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