# Convert-Top

> Free unit converter and measurement reference: 127 categories and about 2,500 units, from everyday length, weight, temperature and cooking measures to scientific, historical and regional units. Every unit, unit pair and common value has its own page with the exact conversion factor, the formula, worked examples and tables. Conversion factors follow SI (BIPM), NIST and the 1959 international yard and pound agreement.

URL patterns:
- Category: https://convert-top.com/{category}/  (e.g. /length-distance/)
- Unit: https://convert-top.com/{category}/{unit}/  (e.g. /length-distance/centimeters/)
- Pair: https://convert-top.com/{category}/{unit}/{from}-to-{to}/  (e.g. /length-distance/centimeters/cm-to-in/)
- Value: https://convert-top.com/{category}/{unit}/{from}-to-{to}/{value}/  (e.g. /length-distance/centimeters/cm-to-in/30/)

## Most used conversions

- [Centimeters to inches](https://convert-top.com/length-distance/centimeters/cm-to-in/): divide by 2.54 (exact)
- [Inches to centimeters](https://convert-top.com/length-distance/inches/in-to-cm/): multiply by 2.54 (exact)
- [Feet to meters](https://convert-top.com/length-distance/feet/ft-to-m/): multiply by 0.3048 (exact)
- [Kilometers to miles](https://convert-top.com/length-distance/kilometers/km-to-mi/): multiply by 0.621371
- [Kilograms to pounds](https://convert-top.com/mass-weight/kilograms/kg-to-lb/): multiply by 2.20462
- [Pounds to kilograms](https://convert-top.com/mass-weight/pounds/lb-to-kg/): multiply by 0.45359237 (exact)
- [Celsius to Fahrenheit](https://convert-top.com/temperature/degrees-celsius/oc-to-of/): °F = °C × 1.8 + 32
- [Fahrenheit to Celsius](https://convert-top.com/temperature/degrees-fahrenheit/of-to-oc/): °C = (°F − 32) × 5/9
- [Cups to milliliters](https://convert-top.com/volume-capacity/cups/cup-to-ml/): 1 US cup = 236.59 mL
- [Gallons to liters](https://convert-top.com/volume-capacity/gallons/gal-to-l/): 1 US gallon = 3.785411784 L (exact)
- [mph to km/h](https://convert-top.com/velocity-speed/miles-per-hour/mph-to-km-h/): multiply by 1.609344 (exact)

## Tools

- [BMI calculator](https://convert-top.com/bmi-calculator/): WHO adult categories, e.g. /bmi/5-ft-7-in-150-lb/, healthy weight for a height /bmi/170-cm/
- [Age calculator](https://convert-top.com/age-calculator/): e.g. /age/born-1990/, /age/30-years-old/
- [Percentage calculator](https://convert-top.com/percentage-calculator/): e.g. /percent-of/15-of-80/, /what-percent/12-of-80/, /percent-change/50-to-75/, /percent-off/20-off-50/
- [Stones and pounds](https://convert-top.com/stones-and-pounds/): body weight, e.g. /stones-and-pounds/11-st-4-lb/, /stones-and-pounds/70-kg/
- [Height converter](https://convert-top.com/height/): feet and inches ↔ cm, e.g. /height/5-ft-7-in/, /height/170-cm/
- [Time zone converter](https://convert-top.com/time-zones/): e.g. /time-zones/est-to-ist/3pm/ (daylight saving aware)
- [Number to words](https://convert-top.com/number-to-words/): e.g. /number-to-words/1250/ (US, UK, Indian wording, check writing)
- [Fraction to decimal](https://convert-top.com/fractions/): e.g. /fractions/3-8/, /decimal-to-fraction/0.375/, /percent-to-fraction/37.5/
- [Unix timestamp converter](https://convert-top.com/unix-timestamp/): e.g. /unix-timestamp/1700000000/
- [Date calculators](https://convert-top.com/days-until/): countdowns, /days-from-today/90/, /days-between-dates/
- [Oven temperature chart](https://convert-top.com/oven-temperatures/): °F, °C, fan oven, gas mark
- [Number systems](https://convert-top.com/number-systems/): binary, hex, octal, Roman numerals

## Cooking

Ingredient pages convert cups, spoons, grams and ounces using each ingredient's weight per cup, e.g. [all-purpose flour](https://convert-top.com/all-purpose-flour/) (1 US cup ≈ 120 g), [granulated sugar](https://convert-top.com/granulated-sugar/) (200 g), [butter](https://convert-top.com/butter/) (227 g).

## Optional

- [All categories](https://convert-top.com/#all-categories)
- [Sitemap index](https://convert-top.com/sitemap.xml)
- [About and sources](https://convert-top.com/about/)