Unit converters
Convert length, weight, temperature, and digital storage sizes in your browser. Pick a tool below or from the grid above—results update as you change values.
Tools in this category
- Length converter — m, km, cm, mm, mi, ft, in.
- Weight converter — kg, g, lb, oz.
- Temperature converter — °C, °F, K.
- Data size converter — B through TB (1024-based steps).
When to use which
Travel, science homework, and product specs often mix metric and US customary—length and weight cover most daily cases. Weather and ovens need temperature. File sizes and drive capacity labels need data units—watch binary vs marketing decimal if numbers disagree with your OS.
Examples
5 miles ≈ 8.05 km. 150 lb ≈ 68 kg. 350 °F ≈ 177 °C. 1 GiB-style GB here equals 1024 MB.
Frequently asked questions
How do I convert cm to inches or feet to meters?
Use the length converter: pick from/to units (e.g. cm → in or ft → m). Example: 170 cm ≈ 66.9 in (about 5 ft 7 in). 6 ft = 1.8288 m exactly on this page.
How many pounds is 1 kg? How do I convert lbs to kg?
The weight converter uses 1 kg ≈ 2.20462 lb. Example: 150 lb ≈ 68.0 kg; 70 kg ≈ 154.3 lb—handy for gym scales, shipping labels, and health forms that mix units.
How do I convert Celsius to Fahrenheit for an oven recipe?
Open the temperature converter. Formula: °F = °C × 9/5 + 32. Example: 180 °C ≈ 356 °F; 350 °F ≈ 177 °C—common for US vs metric baking temps.
Is 1 GB 1000 MB or 1024 MB?
On the data size converter, 1 GB = 1024 MB (binary steps, same idea as GiB). Retail drive boxes often use decimal 1000-based GB, which is why a “1 TB” disk can show ~931 GiB in the OS—convert with the same base you are comparing.
How many miles is 5 km (or km to miles for driving)?
Use length converter mi ↔ km. Rule of thumb: 1 mi ≈ 1.609 km, so 5 km ≈ 3.11 mi and 10 km ≈ 6.21 mi—typical for speed limits and road signs abroad.
Why does my hard drive show less space than the label?
Manufacturers often quote decimal GB/TB (1000-based) while Windows/macOS file sizes use 1024-based KB/MB/GB. A 500 GB label ≈ 465 GiB in binary counting—use the data size tool with 1024 steps to match most file-property dialogs.
Which length and weight units are on CalcTool?
Length: km, m, cm, mm, mi, ft, in on the length converter. Weight: kg, g, lb, oz on the weight converter. All update instantly in the browser—no signup.
When should I use Kelvin vs Celsius?
Everyday weather and cooking use °C or °F on the temperature converter. Kelvin (K) is absolute scale: 0 K = −273.15 °C; science homework and physics often require K—same tool converts C, F, and K.
How do I convert ounces to grams or cups to grams?
Mass in oz ↔ g is on the weight converter (1 oz ≈ 28.35 g). Volume “cups” depend on ingredient density—this hub does not convert cups to grams; use weight when a recipe lists oz or g.
Where do I convert MPG, L/100 km, or fuel economy?
Fuel labels are not length or weight—use the fuel economy converter under Everyday calculators (US MPG, L/100 km, km/L). US MPG here uses US gallons, not imperial UK gallons.