# Weight (Mass) Conversion Calculator

## Calculator Use

This online conversion calculator will convert among different units of weight or mass. For more specific calculations use avoirdupois unit conversions and troy unit conversions.

## How to Convert Units of Weight

Conversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem:

**S * C = E**

Where **S** is our starting value, **C** is our conversion factor, and
**E** is our end converted result.

To simply convert from any unit into grams^{}, for example, from 5 kilograms, just
* multiply by* the conversion value in the right column in the table below.

5 kg * 1000 [ (g

^{}) / (kg) ] = 5000 g^{}

To convert from g^{} into units in the left column
* divide by* the value in the right column or, multiply by the reciprocal, 1/x.

5000 g

^{}/ 1000 [ (g^{}) / (kg) ] = 5 kg

To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into grams then divide by the factor for B to convert out of grams. Or, you can find the single factor you need by dividing the A factor by the B factor.

For example, to convert from kilograms to pounds you would multiply by 1000 then divide by 453.59237. Or, multiply by 1000/453.59237 = 2.204622. So, to convert directly from kg to lb, you multiply by 2.204622.

Unit

Symbol

( g )

( g / Unit )

## References/ Further Reading

The National Institute of Standards and Technology (NIST) -
*The NIST Guide for the use of the International System of Units* - Appendix B, subsections
B.8 Factors for Units Listed Alphabetically and
B.9 Factors for units listed by kind of quantity or field of science.

Lide, David R., Daniel (Editor-in-Chief).
*CRC Handbook of Chemistry and Physics, 89th Edition* New York, NY: CRC Press, p. 1-28, 2008.

Wikipedia contributors. "Conversion of units" Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, last visited 24 Jun. 2011.