Unit Converter

How to use Unit Converter

Select a measurement category, enter a value, and choose source and destination units. Use Swap to reverse the units without re-entering the value.

Supported conversions

Convert common length, mass, temperature, volume, area, speed, and digital-storage units without external rates or data feeds.

Decimal and binary storage

KB, MB, and GB use powers of 1,000. KiB, MiB, and GiB use powers of 1,024, so similarly named values are not interchangeable.

Precision and limitations

Results show up to 12 significant digits and suppress ordinary floating-point noise. Volume conversions measure pure volume and do not convert ingredient weight or density. Currency is not supported.

Unit Converter FAQ

Can temperature use the same multiplier method?

No. Temperature conversion uses scale and offset formulas.

Can I enter negative values?

Yes, including temperatures below zero.

Related tools

Definition and result meaning

Unit conversion expresses the same physical quantity in another unit. A conversion factor must match the quantity type; length cannot convert directly to mass or temperature.

The numeric value changes while the represented quantity stays constant. Attach the destination unit to every result.

Logic and formula

For multiplicative conversions, destination value = source value × source-to-base factor ÷ destination-to-base factor. Temperature needs an offset as well as scale.

Keep full precision through intermediate steps when checking the result. Round only the final value to the precision the task needs; early rounding can compound into a visibly different answer.

Worked example

Convert 2.5 meters to centimeters: 2.5 × 100 = 250 centimeters. Converting 250 centimeters back by dividing by 100 returns 2.5 meters.

A reverse conversion should recover the starting value within displayed rounding.

Assumptions, edge cases, and limitations

Inputs assume the selected units describe the same supported quantity. Prefix capitalization matters in formal notation, and temperature zero points require dedicated formulas.

Displayed decimals may be rounded. Measured data cannot gain real precision merely because conversion produces more digits. This tool is not a calibration certificate.

Calculations run in this browser and entered values are not submitted to Awesome Tools. JavaScript numbers have finite precision, so extremely large values or long decimal expansions can be rounded. Use exact-decimal or domain-specific software when contractual, scientific, or financial rules require controlled precision.

Common mistakes

Common errors include using area factors for length, forgetting to square or cube a linear factor, confusing decimal storage prefixes with binary prefixes, and dropping units.

Write down units beside inputs before calculating. A numerically correct result can still be unusable when values represent different units, periods, populations, or definitions.

Result-checking FAQ

Why are some conversion results long decimals?

Many unit ratios do not terminate neatly in base 10. Round to precision justified by the original measurement, not every displayed digit.

How should I verify an important result?

Recalculate from the original inputs, confirm units and signs, and use the stated inverse or reasonableness check. For decisions governed by a school, retailer, contract, measurement standard, or other external rule, verify that rule before applying the result.

Authoritative reference

For definitions or rules that affect important use, consult NIST SI units guidance and the governing organization for your specific task.