Unit Converter

Instantly convert length, weight, temperature, volume, speed, data, energy & more. Bidirectional, real-time, and 100% browser-based.

Unit Converter – SynetrixTools

⚖️ Conversion Result

Precision:

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📐 Enter a value above to see the conversion formula.

Category

Length

Units Available

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From

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⭐ Popular Conversions

💡 Tips

✅Type in either field — both directions convert in real time.
✅Use the ⇄ swap button to instantly reverse the conversion.
✅Click any row in the table to set it as your "To" unit.
✅Adjust precision to see more or fewer decimal places.
✅Click a popular conversion shortcut to load it instantly.
✅All conversions run locally — no internet required.

❓ Frequently Asked Questions

How accurate are the conversions? ▼

All conversions use internationally recognised exact or high-precision factors (e.g. 1 inch = 25.4 mm exactly). Results are accurate to JavaScript's 64-bit floating-point precision (~15–17 significant digits). Use the "Full" precision mode to see the complete result without rounding.

Why is temperature different from other units? ▼

Most unit conversions are simple multiplications (e.g. km × 1000 = m). Temperature scales use offset formulas — for example, °C to °F is (°C × 9/5) + 32 — because their zero points differ. The formula box always shows the exact formula being applied.

Can I convert in both directions? ▼

Yes — you can type in either the "From" or "To" field and the other will update instantly. You can also hit the ⇄ swap button to reverse the direction of the conversion at any time.

What does the conversion table show? ▼

The table shows your entered value converted into every available unit for the selected category simultaneously. This is useful when you need to compare across many units at once — for example, seeing a distance in miles, kilometres, feet, and nautical miles all at the same time.

Does this work offline? ▼

Yes. All conversion logic runs entirely in your browser using JavaScript. Once the page has loaded, no internet connection is required. No data is ever sent to a server.