Mass units for scales and labels
A scale or package commonly calls its reading weight; this converter changes the mass unit of that reading. It uses ordinary avoirdupois pounds and ounces, which differ from the troy ounces used for precious metals. The metric ton in the menu is a tonne of 1,000 kg, not a US short ton.
Worked examples
Formula / Calculation Method
1 lb = 453.59237 g; 1 lb = 16 oz; 1 stone = 14 lb.
How to Use This Tool
- Enter a number using a period for decimals, for example 2.5.
- Choose the From and To units. The result and reference table update as you type.
- Use Swap to reverse the units while keeping your entered value, or Copy Result to save the conversion.
Common Use Cases
Avoid mixing mass and volume
Use grams and ounces for a weighed ingredient. A cup of flour and a cup of oil do not have the same mass, so converting cups to grams also requires the ingredient's density and how it was measured. The volume converter handles US cups and other volume measures.
The definitions behind these factors are fixed, but the number shown is rounded to 12 significant digits. Your scale's accuracy still sets the useful precision. For a stone-and-pounds value, convert the parts separately or enter the total pounds; 10 stone 7 lb is 147 lb, not 10.7 stone.
Common conversions and worked examples
Choose a starting pair, then change the units as needed. The examples below explain how to interpret the result for a specific task.
KG to Pounds
A kilogram reading can be compared with a pound limit without changing the underlying mass. Start with the measured value, then round only for the precision of the scale or form you are using. This page uses ordinary avoirdupois pounds, with 16 ounces in a pound.
Using a pound limit
Compare the unrounded reading when you are close to a threshold. A conversion does not include packaging weight or a carrier's rules for rounding billable weight. Weigh the complete parcel and read those rules separately.
Pounds to KG
Use the full pound reading, including its decimal part. The pound here is the ordinary mass unit used on household scales and packaging. It is not pound-force, which measures force, or the troy pound used in some precious-metal contexts.
Convert a mixed pound-and-ounce reading
First divide the ounces by 16 and add the pounds. For 7 lb 8 oz, enter 7.5 lb; that gives 3.401942775 kg. Entering 7.8 would instead represent 7 lb 12.8 oz. Keep the same unit when comparing entries over time so display rounding does not look like a real change.
Grams to Ounces
Grams and ounces here both measure mass, so the conversion is the same for flour, butter, or a parcel when they are weighed. An ounce marked fl oz is a volume measurement and cannot be converted from grams without knowing the substance's density.
Check the ounce on the label
This shortcut uses avoirdupois ounces for ordinary goods. It does not use troy ounces for precious metals or US fluid ounces for liquids. If a recipe specifies cups or fluid ounces, use its own ingredient weights or a suitable density reference instead of treating grams as milliliters.
Ounces to Grams
Select this shortcut when a recipe or package gives ordinary ounces by mass. A kitchen scale can then measure the gram result directly. Fractional ounces should be entered as decimals: one and a half ounces is 1.5, not 1/2 or 1:5.
Match the scale to the recipe
Extra digits in the answer describe the conversion, not what a kitchen scale can reliably measure. Round once at the end. A liquid label that says fl oz needs the volume converter; an oz label for gold or silver may mean a troy ounce and needs a different factor.