ToolNestFree Online Unit Converter
Convert between length, weight, temperature, volume, data, speed, area, and time units instantly. Pick a category, choose your from/to units, and get precise metric↔imperial conversions — plus quick links to popular conversions like kg to lbs and cm to inches below.
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✓ Free forever · ✓ No signup · ✓ Runs in your browser — your data never leaves your device.
How to Use the Unit Converter
- Choose a category (length, weight, temperature, etc.).
- Pick the units to convert from and to.
- Type your value — the result updates live.
- Use the ⇄ button to flip the conversion direction.
Why Use Our Unit Converter?
- 8 categories — length, weight, temperature, volume, data, speed, area, time.
- Metric + imperial — full coverage both directions.
- Live results — converts as you type, no button needed.
- 150+ popular conversions — dedicated pages for combos like kg-to-lbs linked below.
Frequently Asked Questions
How accurate are the conversions?
Factors use full precision (e.g., 1 inch = 2.54 cm exactly); results round for display only.
Can I convert temperature?
Yes — Celsius, Fahrenheit, and Kelvin with the correct offset formulas, not just scaling.
Is there a page for a specific conversion?
Yes — popular pairs like kilograms-to-pounds have dedicated pages; browse the converter links below.
Does it work offline?
Once loaded, the page converts without any network — it's pure JavaScript.
Is it free?
Completely free, no signup, unlimited conversions.
Popular Conversions
Jump straight to the pair you need:
- Kilograms to Pounds
- Pounds to Kilograms
- Centimeters to Inches
- Inches to Centimeters
- Celsius to Fahrenheit
- Fahrenheit to Celsius
- Miles to Kilometers
- Kilometers to Miles
- Meters to Feet
- Feet to Meters
- Grams to Ounces
- Ounces to Grams
- Liters to Gallons
- Gallons to Liters
- Megabytes to Gigabytes
- Gigabytes to Megabytes
- Miles per Hour to Kilometers per Hour
- Kilometers per Hour to Miles per Hour
- Hours to Minutes
- Minutes to Hours
- Days to Hours
- Acres to Hectares
- Square Feet to Square Meters
- Celsius to Kelvin