Free Unit Converter
Convert length, weight, temperature, area, volume, speed, time and data storage instantly. Accurate, fast and completely free.
How to Use the Unit Converter in 3 Steps
- Enter the value you want to convert in the input box.
- Select the source unit (e.g. miles) and the target unit (e.g. kilometers).
- Read the instant result — tap swap to reverse the conversion direction.
Frequently Asked Questions
What does a unit converter do?
A unit converter translates measurements between systems — for example miles to kilometers, pounds to kilograms, or Fahrenheit to Celsius. Ours covers length, weight, temperature, volume, area, speed, time and data size, with precise conversion factors built in. Students, travelers, cooks and engineers use it daily to switch between metric and imperial systems without manual math.
Which measurement categories are supported?
Length (km, miles, meters, feet, inches), weight (kg, pounds, grams, ounces), temperature (°C, °F, Kelvin), volume (liters, gallons), area, speed (km/h, mph), time and digital data (MB, GB, TB). Digital storage units like MB, GB and TB are included too, which helps when comparing phone or laptop specifications.
How do I convert miles to km or pounds to kg?
Type the value, pick the source unit, pick the target unit — the result appears instantly. You can swap direction with one tap, which is handy when comparing specs written in different systems. Results appear as you type, and the swap button flips the direction — handy when a recipe or spec sheet uses unfamiliar units.
How are temperature conversions calculated?
Temperature uses formulas rather than simple multiplication: °F = (°C × 9/5) + 32. The tool applies the correct formula automatically, including Kelvin conversions used in science and engineering. Absolute zero and other reference points are handled correctly, so science and engineering calculations stay accurate.
Are the conversion results accurate?
Yes — the factors come from international standard definitions (e.g. 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg). Results are shown with sensible precision so you get accurate answers for homework, cooking, travel and engineering estimates. Displayed values are rounded sensibly, but the underlying factors keep full precision for reliable results.
Is the unit converter free and private?
Completely. Every conversion runs locally in your browser with no server calls, no account and no tracking. It loads in under a second and works on any phone or desktop. Because there are no server calls, conversions are instant and the tool keeps working even if your connection drops.
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