Unit Converter
Convert units online free — length, weight, temperature, area, volume, speed, data and more. Instant conversion, no signup required.
✓ Free · No signup · Works in browser · 100% private
Result
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Common conversions
Why use this tool
Fast, Accurate Unit Conversion
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7 Categories
Length, weight, temperature, area, volume, speed, and digital data — all in one tool.
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Instant Results
Real-time conversion as you type — no need to click a button.
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Swap Units
One click to reverse the conversion direction — from and to units instantly swap.
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All Systems
Metric, imperial, and US customary units — everything you need in one place.
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Browser-Only
No data is sent anywhere. All conversions happen locally in your browser.
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Mobile Ready
Works on any device — phone, tablet, or desktop — without installing anything.
How it works
Convert Units in 3 Simple Steps
1
Select a category (length, weight, temperature, etc.)
Click one of the category tabs at the top of the tool to switch between unit types.
2
Enter a value and select the units to convert from and to
Type your number, choose the source unit from the left dropdown, and the target unit from the right dropdown.
3
See the instant result — click ⇌ to swap units
The result appears immediately as you type. Hit the swap button to reverse the conversion direction in one click.
FAQ
Frequently Asked Questions
Which unit systems does it support?
The converter supports metric (SI), imperial, and US customary systems. This covers units like kilometers, miles, kilograms, pounds, Celsius, Fahrenheit, Kelvin, liters, gallons, and many more across all seven categories.
How accurate are the conversions?
Conversions are calculated with up to 10 significant figures of precision using JavaScript's double-precision floating-point arithmetic — accurate enough for virtually all practical, scientific, and engineering applications.
Can I convert temperature?
Yes. The Temperature category supports Celsius (°C), Fahrenheit (°F), and Kelvin (K) with exact conversion formulas — not approximations. Switch to the Temperature tab and select your units.
Is there a limit to what I can convert?
There are no practical limits. The tool handles very small and very large numbers equally well. Simply type in your value and the conversion result appears instantly — no upper or lower bound restrictions.
Does this tool work offline?
Once the page is loaded, all conversions run entirely in your browser with no server calls. If you already have the page open, it will continue working even if your internet connection drops.
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