Pressure and speed conversions

Use PSI to bar or bar to PSI when reading tyre gauges, pumps, HVAC equipment, or technical specifications that use different pressure units. For a quick check, 32 PSI is about 2.21 bar, but use the exact result for a specification or setting.

Use km/h to mph or mph to km/h for road signs, vehicle displays, cycling computers, and travel. The result is a reading aid; follow the legal unit and value shown on the local sign or document.

Volume, weight, and length

Volume conversions such as litres to gallons, gallons to litres, millilitres to cups, and tablespoons to millilitres are useful for recipes, packaging, and product specifications. Check whether the source uses US or Imperial units because a gallon is not the same size in both systems.

For weight and length, choose the converter that matches the original measurement rather than guessing from the number alone. Keep the original value beside the converted result when copying it into a form or spreadsheet.

Check rounding and privacy

Most practical conversions are rounded for display, while the calculation uses a more precise factor. If a result is being used for engineering, medical, legal, or financial work, confirm the required precision and the source unit before using it.

Shard Tools performs these arithmetic conversions in the browser. The number you enter is not uploaded or stored, and the result is available immediately without an account.