Unit Converter — km to Miles, kg to lbs, Celsius to Fahrenheit (Free)

How to Use

Pick a category: Length, Weight, Temperature, Area or Volume.
Choose the from and to units for that category.
Enter the value you want to convert. The result updates instantly, and you can deepen your setup by selecting different pairs of units.

All conversions are computed locally in your browser, so nothing you enter is sent anywhere. This makes it safe to convert measurements from work, recipes or projects without sharing them.

Each category includes the common units you will actually use: meters, kilometers, centimeters, millimeters, miles, yards, feet and inches for length; kilograms, grams, milligrams, tons, pounds and ounces for weight; Celsius, Fahrenheit and Kelvin for temperature; square meters, square kilometers, hectares, acres, square feet and square centimeters for area; and liters, milliliters, cubic meters, US gallons, US cups and US fluid ounces for volume.

Tips

Between metric and imperial, the relationship is fixed — for example, one mile equals 1.609 kilometers and one kilogram equals 2.2046 pounds — so the results are precise rather than approximate. For temperature, remember Fahrenheit and Celsius run on different scales, which is exactly why a converter beats mental math.

Choose the right category first, because units only convert within their own group. When cooking an international recipe or shipping a parcel with mixed units, do every value in the same pass so you keep comparisons consistent.

Why use it

Between metric and imperial systems, converting units by hand is slow and easy to get wrong. Whether you are converting kilometers to miles, kilograms to pounds, or Celsius to Fahrenheit for travel, cooking or work, an instant converter saves time and removes mistakes. It is free, runs entirely in your browser, and has no upload or registration.

Real-world use cases

Home buying: Estimate monthly payment and total interest before talking to a bank. Adjust years vs. rate to see the trade-off.
Budgeting: Use percentage and discount calculators to quickly check sale prices while shopping.
Planning: Workday and unit converters save time when coordinating across teams and regions.

How accurate is it?

Results use standard formulas with double-precision floats, matching Excel and banking calculators to within cents. Assumptions are shown in the note (e.g., monthly compounding). For legally binding totals, confirm with the provider because fees, insurance and rounding rules differ.

Pro tips

For loans, compare equal-payment vs equal-principal: the latter starts higher but pays less interest overall.
For fuel and discount math, keep one decimal extra while comparing options, then round for display.
Save results with a screenshot or copy; everything is local so refreshing clears the form.

FAQ

How do I convert kilometers to miles?

Choose Length as the category, set From as kilometer and To as mile, then enter a value. The conversion appears instantly. Everything runs locally in your browser, so no numbers are uploaded.

How do I convert kilograms to pounds?

Select Weight as the category, pick kilogram as the source and pound as the target, then enter the value. The tool returns the result immediately, ready to use for recipes, fitness and shipping.

How do I convert Celsius to Fahrenheit?

Choose Temperature as the category and set Celsius to Fahrenheit. Enter the temperature and you get the converted value right away, along with support for the reverse direction.

Are calculations done locally?

Yes. No data is sent to a server. Results are computed instantly.

How accurate are the results?

Uses double-precision math matching Excel. For legal totals confirm with provider.

Can I use this offline?

Yes. Load once, then it works without internet.