Weight Calculator
Convert weight between all standard units: kg, g, lb, oz, stone, metric tons, short tons, and long tons. Also calculate the number of items from total weight. Free, no sign-up.
Convert weight and mass between all common units. Enter a value and source unit, then see conversions to kg, g, mg, metric tons, lb, oz, stone, short tons, and long tons. Optional: calculate number of items given weight per item.
Leave blank to skip item count calculation
Formula
1 kg = 2.20462 lb | 1 lb = 453.592 g | 1 oz = 28.3495 g | 1 stone = 6.35029 kg | 1 metric ton = 1,000 kg | 1 short ton = 907.185 kg | 1 long ton = 1,016.047 kg
Standard weight conversion factors between metric (kg, g, metric tons) and imperial (lb, oz, stone, short tons, long tons) units. Metric tons are used internationally; short tons are US standard; long tons are UK/Commonwealth standard. Enter any weight and see all conversions instantly.
Frequently Asked Questions
Use this in your workflow
Pair weight conversion with the Density Calculator to find total weight from volume. Use the Volumetric Weight Calculator for shipping rates. Browse all Free Logistics Calculators.
When to use this calculator
- →Converting between metric (kg) and imperial (lb, oz) units for international orders
- →Comparing shipping quotes that specify weight in different units
- →Calculating item counts from total weight and weight per unit
- →Verifying packaging specifications across different regions and standards
Worked example: international procurement
Comparing suppliers using different weight units.
| Specification | Value |
|---|---|
| Total shipment weight | 500 kg |
| Weight in lb (US) | 1,102.31 lb |
| Weight in metric tons | 0.5 tonnes |
| Weight per unit | 2 kg |
| Number of units | 250 units |
| Shipping tier | Class 50 (if low-density) |
A 500 kg shipment converts to 1,102 lb in US units. If you're comparing quotes from US, European, and Asian suppliers, enter the weight in each unit to verify consistency. Calculate item counts to cross-check order quantities.
Limitations
This calculator converts mass and weight using standard Earth gravity. For precision applications (aerospace, laboratories), account for local gravity variations. Weight and mass differ technically; mass is constant while weight changes with gravity. This calculator assumes Earth surface conditions. For shipping, verify that your carrier distinguishes between actual weight and volumetric (chargeable) weight. Results are for planning purposes — verify with official specifications for critical decisions.
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Frequently asked questions
How do I convert kg to lb?
Multiply kg by 2.20462. For example, 10 kg × 2.20462 = 22.0462 lb. This calculator does all conversions automatically.
What's the difference between short tons, long tons, and metric tons?
Short ton (US) = 2,000 lb = 907.185 kg. Long ton (UK) = 2,240 lb = 1,016.047 kg. Metric ton = 1,000 kg ≈ 2,204.62 lb. Shipping specifies which standard applies.
What units does this calculator support?
Metric: kg, g, mg, metric tons. Imperial: lb, oz, stone. Tonnage: short tons (US), long tons (UK). Enter any value and see all conversions instantly.
How do I calculate the number of items from total weight?
Divide total weight by weight per item. For example, 100 kg ÷ 2 kg/item = 50 items. This calculator does the division; just enter weight per unit.
Why convert weight for shipping?
International shipping uses different standards: metric in Europe/Asia, imperial in North America. Quotes may specify short tons, long tons, or metric tons. This calculator instantly converts to compare costs and verify documentation.
Is this calculator accurate for all purposes?
Yes for standard Earth surface conditions. This calculator uses standard conversion factors recognized globally. For precision physics or locations with unusual gravity, results are approximate for practical logistics use.