Everyday measurements
Three jobs, three conversions
Choose the category first, then the starting and destination units. A correct number in the wrong category is still the wrong measurement.
Measure a shelf
36 in = 91.44 cm
Multiply inches by 2.54. Compare the result with the available opening, then allow whatever clearance the fitting needs. Conversion does not add installation tolerance.
Weigh an ingredient
500 g ≈ 1.1023 lb
This is mass to mass. Cups measure volume, so converting grams to cups needs information about the ingredient and is outside this tool.
Read a temperature
20°C = 68°F
Temperature uses both scaling and an offset: °F = °C × 9/5 + 32. Do not simply multiply by a fixed conversion factor.
Keep the units attached
Write “91.44 cm” in your notes rather than “91.44”. For length and weight, the tool converts through a shared base unit before converting to the destination. Millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles belong to length; milligrams through tonnes, ounces, and pounds belong to weight.
The ounce here is a weight ounce, not a fluid ounce. The tonne is a metric tonne of 1,000 kilograms, not a US short ton. A decimal foot is not a feet-and-inches notation: 5.5 feet means 5 feet 6 inches.
| Check | Example |
|---|---|
| Direction | 1 m = 100 cm; 1 cm = 0.01 m. |
| Rounding | Keep extra digits while calculating, then round the final measurement. |
| Temperature scale | 0°C = 32°F = 273.15 K. |
| Temperature change | A rise of 10°C is a rise of 18°F, not a final temperature of 50°F. |
What this does not measure
The converter changes units, not the accuracy of the original reading. A ruler measured to the nearest centimetre does not become more precise because the result has several decimals. It also does not convert area, volume, speed, or currencies.
For a negative temperature, keep the sign. Kelvin starts at absolute zero; a mathematical conversion of an impossible input is not a physically valid measurement. All calculations happen locally, and reloading clears your entries.