Weight and Mass Converter
Convert everyday weight labels and technical mass units through kilograms. The page supports metric mass, avoirdupois pounds and ounces, stones, short tons, long tons, grains, and slugs with a full comparison table.
Base unit
kilogram
Supported units
12
Includes
metric + avoirdupois
Live converter
Weight and mass inputs
Enter a value, choose the source and target units, then inspect the full table for related physical units.
Converted result
68.0388555 kg
Input
150 lb
Output unit
kg
Base method
kilograms
Mass in every supported unit
| Unit | Converted value | Unit name |
|---|---|---|
| ug | 6.803886 x 10^+10 | Micrograms |
| mg | 68,038,855.5 | Milligrams |
| g | 68,038.8555 | Grams |
| kg | 68.0388555 | Kilograms |
| t | 0.0680388555 | Metric tonnes |
| gr | 1,050,000 | Grains |
| oz | 2,400 | Ounces avoirdupois |
| lb | 150 | Pounds avoirdupois |
| st | 10.7142857143 | Stones |
| ton (US) | 0.075 | Short tons |
| ton (UK) | 0.0669642857 | Long tons |
| slug | 4.6621434641 | Slugs |
Convert body weight, packages, recipes, and technical mass
Everyday weight labels
Move between pounds, ounces, kilograms, grams, and stones for health, travel, fitness, and consumer labels.
Shipping and inventory
Compare kilograms, pounds, short tons, long tons, and metric tonnes for logistics and material estimates.
Science and engineering
Convert small metric masses, grains, and slugs when a problem mixes measurement traditions.
Weight and mass conversion formula
The converter treats unit labels as mass values and normalizes every input to kilograms before scaling to the target unit.
Working formulas
Base conversion
kilograms = value x kilograms per source unit
The input is first converted into the SI base unit for mass.
Target value
target value = kilograms / kilograms per target unit
The kilogram value is divided by the target unit factor.
Exact pound relationship
1 lb = 0.45359237 kg
The avoirdupois pound factor anchors pounds, ounces, and stones.
Symbols
- kilograms per unit - mass factor
- The factor used to normalize the source or target unit.
- target value - converted mass
- The displayed result after scaling from kilograms.
Why this mass converter is practical
Clear unit systems
- Metric mass and avoirdupois units are shown together without hiding the kilogram base.
- Short tons and long tons are separate entries, reducing ambiguity in logistics and material notes.
- The result table makes it easy to compare nearby units without retyping the source value.
Audit-friendly precision
- The formula section shows the kilogram route used by the converter.
- Pound and ounce conversions use the exact international pound relationship.
- Small and large results remain readable with compact formatting and scientific notation when needed.
Useful when weight labels cross systems
Health and fitness
Convert body weight and equipment loads between pounds, kilograms, stones, and ounces.
Shipping teams
Compare package and freight masses across kilograms, pounds, short tons, and metric tonnes.
Students and labs
Convert grams, milligrams, kilograms, grains, and slugs for classroom and technical examples.
How it works in three quick steps.
Enter the value
Type the weight or mass from a label, recipe, shipment, classroom problem, or specification.
Select units
Choose the source unit and the target unit. The result updates immediately and the table shows every supported unit.
Audit the kilogram route
Use the formula section to confirm the value was normalized to kilograms before being scaled into the target unit.
Keep mass conversions easy to reuse
Copy selected result
Copy the source and target unit result with labels for documents, assignments, and shipment notes.
Print the table
Print the full mass table when a task needs repeated lookups across metric and customary units.
Reference the formula
Use the kilogram formula notes to explain which conversion factor produced the result.
About this weight and mass converter
Weight and mass conversion is common in everyday work, but the labels can be imprecise. A scale reading in pounds or kilograms is usually treated as weight in casual language, while the conversion factor is a mass relationship. This page uses kilograms as the base so metric, avoirdupois, and engineering mass units can be compared consistently.
The converter separates units that are often confused, especially short tons and long tons. It also includes small metric units and grains for cases where a problem or product specification reaches beyond pounds and kilograms. The full table lets users see the surrounding unit scale without repeating the same input.
The formula section is visible because physical unit conversions should be auditable. A copied result is more useful when another person can see that the value was normalized to kilograms and then converted into the target unit.
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