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Convert units, compare time zones, calculate running pace, estimate costs, and make better value comparisons using transparent formulas and practical tools.
Convert lengths and distances.
Mass & WeightConvert mass and weight.
TemperatureConvert temperature scales.
SpeedConvert speed.
AreaConvert area.
VolumeConvert volume.
PressureConvert pressure.
EnergyConvert energy.
PowerConvert power.
ForceConvert force.
TorqueConvert torque.
DensityConvert density.
AccelerationConvert acceleration.
AngleConvert angles.
FrequencyConvert frequency.
Flow RateConvert flow rate.
Fuel EconomyConvert fuel economy.
Digital StorageConvert storage sizes.
Data TransferConvert transfer speeds.
CookingConvert cooking measures.
Time DurationConvert time durations.
Every conversion starts from a documented reference factor. Where a value is exact by international agreement we label it as exact. Where a value is a measured or conventional constant we note the source and expected precision. Results are computed with full floating-point precision and rounded only for display.
A gallon in the United States is not the same as a gallon in the United Kingdom. A cup can be US customary, US legal, metric, Imperial, or Australian. We label each unit with its regional standard so you know which version you are converting.
We use internationally defined constants where they exist and documented reference values otherwise. See our methodology and sources pages for details.
No. All conversions, calculations, and batch processing run locally in your browser. We do not store or transmit the numbers you enter.
Yes. The site is supported by a limited number of advertisements that are kept separate from the calculator controls and results.