Conversion index
Common conversions
Popular direct unit conversion pages with calculator tools, formulas, and example tables for everyday measurements.
Browse by measurement type, open a category converter for broader unit choices, or jump straight to a direct pair such as centimeters to inches, kilograms to pounds, or kilometers per hour to miles per hour.
Find a route
Search common conversion pages
Filter the index by unit name, symbol, category, or conversion label.
74 conversion links shown
Browse common conversions by category
Each category groups direct conversion pages and links back to the full converter for more unit choices.
Length
Convert between metric, imperial, and astronomical length units.
Temperature
Convert between Celsius, Fahrenheit, Kelvin, and Rankine.
Area
Convert between metric and imperial area units.
Volume
Convert between metric, US, and imperial volume units.
Weight and Mass
Convert between metric and imperial mass units.
Speed
Convert between common speed units.
Angle
Convert between angle units.
Fuel Consumption
Convert between fuel consumption and fuel economy units.
Energy
Convert between joules, calories, watt hours, and BTUs.
Power
Convert between watts, horsepower, and other power units.
Popular conversion pairs
Start with frequently used forward and reverse conversion pages.
How these conversion pages work
- Each direct page opens with the relevant units selected in the calculator.
- Formula, example, and table sections explain the relationship behind the result.
- Category converter links are available when you need a unit pair that is not listed here.
Choosing the right converter
Use a direct common conversion page for a known pair, or open the category converter when you want to compare several units in the same measurement family.
Common conversions FAQ
Are all common conversion pages calculator pages?
Yes. Each linked page includes a calculator with the relevant units selected, plus supporting formula and example content.
Why are forward and reverse conversions both listed?
Many searches use a specific direction, so both directions are linked when a reverse page exists.
What if my exact unit pair is not listed?
Open the category converter for that measurement type to choose from the full unit list.
Are results rounded?
Calculator results are formatted for readability. Use the formula and table on each conversion page when you need to check the relationship.