Which units does this converter support?

Length (mm, cm, m, km, inch, foot, yard, mile), weight (mg, g, kg, tonne, ounce, pound, stone), temperature (Celsius, Fahrenheit, Kelvin), volume (ml, l, m³, teaspoon, tablespoon, cup, fl oz, gallon), area (m², km², hectare, acre, ft², sq mile) and speed (km/h, mph, m/s, knots).

How accurate are the conversions?

Conversions use exact internationally defined factors (e.g. 1 inch = 25.4 mm exactly, 1 lb = 453.59237 g exactly) and are computed with full floating-point precision. Displayed results are rounded to 6 significant digits.

Why is temperature handled differently?

Temperature scales have different zero points, so they need offset formulas rather than simple factors: °F = °C × 9/5 + 32, K = °C + 273.15. The converter applies these exactly.

Is a US cup the same as a metric cup?

No — this tool uses the US customary cup (236.588 ml) . A metric cup is 250 ml and a UK cup traditionally 284 ml. For baking recipes, check which the recipe author meant; that difference is enough to ruin a dough.

Does this work offline?

Yes — after the page loads once, all conversion math runs entirely in your browser. Nothing is sent to a server.

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Unit Converter — Free Online Tool

Length, weight, temperature, volume, area & speed — exact factors

Free unit converter for length, weight, temperature, volume, area and speed. Exact international factors, live results, swap button. No signup, works offline.

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Key Takeaways

Unit Converter is a free, browser-based calculator tool — length, weight, temperature, volume, area & speed — exact factors.
No signup, no downloads, no file uploads. Tools run in your browser; the few that need an outside service say so on the page.
Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use Unit Converter

Open the tool: Launch Unit Converter on Toololis — no account or download needed.
Enter your data: Paste text, enter values, or select a file directly in your browser.
Get instant results: Everything is processed locally — results appear immediately.
Copy or download: Save your output or share it. Bookmark for quick access next time.

Unit Converter — Quick Facts

Price: Free — no limits, no watermarks, no paywalls
Privacy: Processed in your browser. Tools that need an outside service say so on the page. Page views are counted (Google Analytics).
Platform: Any modern browser on desktop, tablet, or mobile
Category: Calculator Tools on Toololis
Offline: Works offline after first visit (Progressive Web App)

Feature	Details
Tool	Unit Converter
Category	Calculator
Signup Required	No
File Upload	None — processed in browser
Mobile Support	Fully responsive
Cost	Free forever

Why Use Unit Converter?

You should try Unit Converter for a quick, private way to length, weight, temperature, volume, area & speed — exact factors. Processing happens in your browser and files are never uploaded; the few tools that need an outside service say so on the page.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.

Key Takeaways

How to Use Unit Converter

Unit Converter — Quick Facts

Why Use Unit Converter?

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