Conversions Calculators

Convert length, mass, temperature and other units with fixed relationships and clear reference tables. This hub groups closely related tools so you can move from a broad question to the calculator that matches the exact job.

Each calculator opens with the working tool first, followed by the formula or method, a worked example, input guidance, common mistakes and related calculators. That keeps the category useful for quick calculations while still giving enough context to verify the result.

Calculator groups in this section

Universal Converter

Convert several common measurement types in one tool.

• Unit Converter — Convert length, weight, temperature, area, volume, speed and more.

Length & Distance

Switch between metric and US/imperial length units.

• Inches to CM Calculator — Convert inches to centimeters.
• CM to Inches Calculator — Convert centimeters to inches.
• Feet to Meters Calculator — Convert feet to meters.
• Meters to Feet Calculator — Convert meters to feet.
• Miles to KM Calculator — Convert miles to kilometers.
• KM to Miles Calculator — Convert kilometers to miles.

Weight & Mass

Convert kilograms and pounds.

• KG to LBS Calculator — Convert kilograms to pounds.
• LBS to KG Calculator — Convert pounds to kilograms.

Temperature

Convert Celsius and Fahrenheit.

• Celsius to Fahrenheit Calculator — Convert Celsius temperatures to Fahrenheit.
• Fahrenheit to Celsius Calculator — Convert Fahrenheit temperatures to Celsius.

How to choose the right calculator

Start with the question you are trying to answer, not just the number you already have. A focused calculator usually gives clearer inputs and a more useful result than a general-purpose tool. If your problem changes units, formula type or planning goal, follow the related-calculator links instead of reusing a tool that was built for a different purpose.

Accuracy, assumptions and rounding

Simple mathematical and unit-conversion tools follow fixed relationships. Finance, health, construction, automotive and other planning calculators may also depend on assumptions you supply. Review the method on the individual calculator page, keep units consistent, and treat estimates as planning information rather than professional advice or a guaranteed real-world outcome.

See our calculator methodology for more detail about formulas, browser-based processing, units, rounding and update practices.