Weight Calculator

What Is a Weight Calculator?

A weight calculator converts a numerical weight measurement from one unit to another. This free online tool supports common metric and imperial units, allowing you to convert measurements such as kilograms, grams, pounds, ounces, stones and tonnes without performing manual calculations.

Weight conversions are useful when working with recipes, shipping measurements, fitness information, product specifications, engineering calculations, education, manufacturing and everyday measurements where different measurement systems are used.

Why Use the Weight Calculator?

The calculator provides a straightforward way to convert weights between commonly used metric and imperial units while showing a complete conversion table for the entered measurement.

How to Use the Weight Calculator

Converting a weight takes only a few seconds. Enter the measurement and select the units that you want to convert between.

1. Enter the weight — Type the numerical weight you want to convert into the Weight field.
2. Choose the starting unit — Select the unit that your original measurement is expressed in from the From menu.
3. Choose the target unit — Select the unit you want the weight converted into from the To menu.
4. Read the result — The converted weight and a full conversion table are displayed automatically.

Convert Weight Between Metric and Imperial Units

Weight measurements are commonly expressed using either metric or imperial units. The metric system uses units such as grams and kilograms, while imperial and US customary measurements commonly use ounces, pounds and stones. Converting between these systems makes measurements easier to compare when information is provided in different units.

For example, kilograms are frequently used for body weight and larger measurements in many countries, while pounds and stones are commonly used for body weight in the United Kingdom. The Weight Calculator can convert between these units as well as smaller and larger measurements.

Common Weight Conversions

Some frequently used conversions include kilograms to pounds, pounds to kilograms, grams to ounces, ounces to grams, kilograms to stones and tonnes to pounds. The calculator performs these conversions using defined conversion factors and displays the result to a suitable level of precision.

Metric and Imperial Weight Units

Metric weight units are based on powers of ten, making relationships between micrograms, milligrams, grams, kilograms and tonnes straightforward. Imperial and US customary units use different relationships. For example, one pound equals 16 ounces, while one stone equals 14 pounds. The calculator handles these relationships automatically.

Weight Conversion Accuracy

The calculator uses standard conversion factors based on the international avoirdupois pound and internationally defined metric relationships. For example, one pound is exactly 0.45359237 kilograms, one ounce is exactly 28.349523125 grams and one stone is exactly 6.35029318 kilograms.

Results may contain many decimal places for very small or very precise measurements. The calculator rounds displayed values for readability while retaining the underlying conversion factors during the calculation. For ordinary everyday measurements, the displayed precision is more than sufficient.

Frequently Asked Questions