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Unit Converter

Calculators Free Updated 1 Sep 2026
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ⓘ About this tool 🔄 Last updated 1 Sep 2026 ✓ Reviewed by TopToolAI Team

Convert between common units of distance, weight and temperature (kilometers/miles, kilograms/pounds, Celsius/Fahrenheit) with a quick reference table of common conversion factors. 100 kilometers converts to roughly 62.1 miles, 10 kilograms to about 22.05 pounds, and 30°C to 86°F — the underlying conversion factors stay visible so you can sanity-check the result rather than just trusting a black box.

How to use Unit Converter

Step-by-step guide to the boxes below. Open it only if you need help.

  1. 1
    Value Number

    Type the number you want to convert, for example 10.

    Example: 10

  2. 2
    From Choose one

    Pick the unit your number is in at the moment.

    Choose one: KilometersMilesKilogramsPoundsCelsiusFahrenheit

  3. 3
    To Choose one

    Pick the unit you want it in. The two must belong together: kilometres with miles, kilograms with pounds, Celsius with Fahrenheit.

    Choose one: MilesKilometersPoundsKilogramsFahrenheitCelsius

  4. 4
    Press “Convert”

    Click the button under the boxes. If something is missing or not valid, a short message tells you which box to fix.

  5. 5
    Read your result

    The converted value is shown under the button. If it looks odd, check that you picked a matching pair. Change any box and try again to compare different numbers.

Reference: 1 km = 0.6214 miles · 1 kg = 2.2046 lb · 0°C = 32°F (formula: F = C × 9/5 + 32).

Unit Converter FAQs

Which unit pairs are supported?
Kilometers/miles, kilograms/pounds, and Celsius/Fahrenheit — the most commonly needed everyday conversions.
Why did I get an error message?
That means the "from" and "to" units aren't compatible (e.g. trying to convert km to kg) — pick units from the same category.
Can I convert km to Fahrenheit or similar mismatched pairs?
No — only units measuring the same kind of quantity can convert to each other (distance to distance, weight to weight, temperature to temperature).
How accurate are the conversions?
They use standard, precise conversion factors (e.g. 1 mile = 1.60934 km), so results are exact, not rounded approximations.

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