Conversion Calculators
Unit converters for height, weight, speed and more.
About these calculators
One converter doing the everyday unit work properly: length, weight, temperature, volume, area, speed and data size under one interface, using exact SI definitions rather than rounded factors that accumulate error across chained conversions.
Temperature converts through absolute zero correctly (the classic −40° identity holds); data-size distinguishes kilobytes from kibibytes explicitly; speed keeps knots alongside km/h for marine and aviation contexts. Where systems define units differently — US liquid gallon versus imperial — the tool labels which system applies instead of averaging them.
Choosing the right calculator
Kitchen and household
Volume handles cups-millilitres-ounces for recipes from different publishing traditions; weight converts grams-ounces-pounds for baking precision; temperature switches ovens between Celsius and Fahrenheit settings without the off-by-rounding that ruins bakes.
Travel and work
Length and area serve property documents quoted in square feet against plans in square metres; speed reconciles km/h road signs with knot instrument readings; data-size clarifies broadband plan gigabytes against device gibibytes — the gap behind many 'missing storage' complaints.
Conversion calculators we stand behind
Also available (1) — work in progress, not yet indexed
These calculators work but are still being checked for accuracy and sourcing, so they are not in search yet. They are free to use.