Conversion Hub
Everyday unit converters in one place — weight, length, distance, temperature.
The converters people search for most, collected in one fast hub. Each tool below converts instantly with the exact internationally defined factor, shows the math, and includes reference tables and answers to common questions.
All tools in this hub
Kilograms to Pounds Converter
Convert kg to lb instantly with the exact factor — free, no sign-up.
Pounds to Kilograms Converter
Convert lb to kg instantly with the exact factor — free, no sign-up.
Centimeters to Feet Converter
Convert cm to ft instantly — height, furniture, and more.
Feet to Centimeters Converter
Convert ft to cm instantly — height, rooms, and DIY.
Miles to Kilometers Converter
Convert mi to km instantly — road trips, running, and more.
Kilometers to Miles Converter
Convert km to mi instantly — travel, running, and cycling.
Celsius to Fahrenheit Converter
Convert °C to °F instantly — weather, cooking, and fever checks.
Fahrenheit to Celsius Converter
Convert °F to °C instantly — weather, ovens, and health.
How it's calculated
Every converter on this hub uses exact defined factors: 1 lb = 0.45359237 kg, 1 ft = 0.3048 m, 1 mi = 1,609.344 m, and the offset formulas °F = °C × 9/5 + 32 / °C = (°F − 32) × 5/9.
Why these conversions are the most-searched
Weight, length, distance, and temperature cover the vast majority of everyday unit conversions. Travelers juggle kilograms and pounds at baggage scales, shoppers translate centimeters on international listings, drivers read kilometers abroad, and cooks convert oven temperatures across recipe traditions. Each dedicated converter on this page is tuned to its pair: prefilled with a sensible value, converting on load, with a one-tap swap button.
The generic converter above handles anything else — pick a category, choose your from and to units, and get an instant result with the exact factor shown.
Exact factors, not approximations
Every converter here uses the internationally defined values: the pound is exactly 0.45359237 kg, the foot is exactly 0.3048 m, and the mile is exactly 1,609.344 m. Temperature uses the proper offset formulas rather than a single factor. That means results match laboratory and legal standards, not just close-enough estimates.
For quick mental math the shortcuts are fine — 2.2 for kg to lb, 1.6 for miles to km — but when money, medicine, or engineering is involved, use the full-precision tools above.
Frequently asked questions
Which unit converter do most people need?
Kilograms to pounds is the single most-searched conversion, followed by centimeters to feet (heights), miles to kilometers (travel), and Celsius to Fahrenheit (weather and cooking). All four have dedicated one-tap converters linked below.
Are these conversion factors exact?
Yes. The pound, foot, and mile are legally defined in metric terms (0.45359237 kg, 0.3048 m, 1,609.344 m), so the factors are exact by definition. Temperature uses the standard offset formulas.
Do the converters work offline?
They run entirely in your browser with no server calls, so once the page has loaded, conversions work even with a flaky connection.
Where can I convert other units?
Our full unit converter handles length, weight, temperature, area, volume, speed, data, time, fuel economy, and currency in one tool — linked in the related tools below.