About UnitCalcs

UnitCalcs is a free online tool for converting between units of length, weight, temperature, volume, area, speed, time, digital storage, energy, power, pressure, and HVAC capacity. We built it to be fast, accurate, and free of clutter — a converter you can trust and bookmark.

Every conversion factor on this site is based on standard, published values (NIST Handbook 44 and NIST Special Publication 811 for exact unit definitions). Each conversion page shows its formula and a worked example so you can verify the math yourself.

UnitCalcs is supported by advertising. We don't sell your data, and we don't require an account to use any converter on this site.