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Accurately convert between 20+ weight and mass units including kilograms, pounds, ounces, and carats. Perfect for cooking, logistics, and scientific research.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Enter one value and choose its starting unit to see corresponding values in nine units: metric tonne, kilogram, gram, milligram, microgram, pound, ounce, carat, and grain. The page is often called a weight converter, but its calculation converts mass. It does not calculate gravitational force.
Each unit is defined here by its multiplier to kilograms. To convert, the tool first maps the entered quantity to kilograms, then divides by the target unit’s kilogram factor. If x is the input, f₁ the source factor, and f₂ the target factor, then result = x × f₁ ÷ f₂.
The pound and ounce use avoirdupois mass units: 1 lb = 0.45359237 kg and 1 oz = 0.028349523125 kg. These are exact conversion relationships in NIST’s unit tables. The ounce is not a fluid ounce, which measures volume, and it is not a troy ounce commonly used for precious metals. A metric carat is 0.2 g; one grain is 0.00006479891 kg.
The metric options scale by powers of ten. A metric tonne is 1,000 kg, while a microgram is one-billionth of a kilogram. Results are calculated from fixed factors and your input; the converter does not rely on market data or a location-specific gravity value.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use a number in the value field. For a practical example, enter 150.
Select pounds to interpret the example as 150 lb, or choose kilograms, grams, or another listed unit when that is the unit you already have.
Choose the display precision from 0 through 10 places. This changes how many digits are shown, not the underlying conversion factors.
Read the converted values for all listed units. Copy an individual result if you need to paste it into a note, spreadsheet, or calculation.
For a quick check, 1 lb converts to 0.45359237 kg, or about 453.59237 g. A displayed result may be shorter if fewer decimal places are selected.
Use cases
See how the tool fits into real work and everyday tasks.
Convert a gram amount to ounces or pounds when a recipe uses a different mass unit. For liquid ingredients measured by volume, use a volume conversion instead; mass and fluid ounces are different quantities.
Convert pounds to kilograms or the reverse when reading equipment with a different unit convention. Retain enough decimal places for the task and follow the scale’s own instructions for measurements used in a formal record.
Convert between grams, kilograms, pounds, and ounces to compare package quantities. If the label or transaction requires a regulated quantity, use the controlling label and measurement rules.
Q&A
Find concise answers to common questions and confusing cases.
One avoirdupois pound is exactly 453.59237 grams, so a rounded display may show fewer digits according to the selected precision.
No. The unit is the avoirdupois ounce, a mass unit. Fluid ounces measure volume, and troy ounces are a different mass unit.
The precision setting controls displayed decimal places. Increase it to reveal more digits; extra displayed digits do not make an approximate input more accurate.
Notes
Review scope, result limitations, and important precautions before use.
Mass and weight are related in everyday speech, but physics distinguishes mass from the force of gravity on an object. This converter performs mass-unit conversion only; it does not output newtons or account for local gravity. Rounding may matter in laboratory, trade, or regulated settings, so follow the applicable measurement specification and retain the original measured value.
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