ConverterWeight Converter
Convert mass among SI, avoirdupois, stone, metric-tonne, and metric-carat units with each convention named.
Uses definition-based relationships, validates complete finite input, and separates exact constants from rounded display.
What This Category Covers
- Kilograms, pounds, ounces, grams, stone, tons, and carats
- Bodyweight and fitness tracking
- Shipping and parcel limits
- Ingredient and small-item mass checks
- Metric and imperial mass reporting
Common Use Cases
- Use kg, g, mg, and tonne for SI mass.
- Use lb and oz for avoirdupois mass; fluid and troy ounces are different.
- Use metric carat for gemstone mass and stone for the established regional mass unit.
Quick Reference
| Task | Recommended Tool | Why It Helps |
|---|---|---|
| Fitness tracking | KG to LBS | Translate app and gym values quickly. |
| Parcel and freight prep | LBS to KG | Aligns carrier limits with local units. |
| Kitchen and portioning | Grams to Ounces | Useful for mixed-region recipes. |
| Jewelry and gemstone specs | Carats to Grams | Converts small high-precision mass values without mixing carat and karat meaning. |
Choose The Mass Convention First
Converter247 retains the everyday category name Weight, but the tools convert mass. SI pages use kg, g, mg, and metric tonne; customary pages use the international avoirdupois lb and oz; carat pages use the metric gemstone carat.
Ounce can also mean troy mass or fluid volume, and ton can mean short ton, long ton, or metric tonne. These pages explicitly use avoirdupois ounce and metric tonne so the arithmetic does not hide that choice.
Exact definitions are carried through the calculation. A reciprocal may have a long decimal expansion, and display rounding does not make the source measurement more precise.
Popular Weight Converter
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WeightKG to LBS
Translate a metric scale or specification into avoirdupois pounds. The international avoirdupois pound is exactly 0.45359237 kg.
WeightLBS to KG
Return an avoirdupois pound value to the SI kilogram. The international avoirdupois pound is exactly 0.45359237 kg.
WeightGrams to Ounces
Express a small metric mass in avoirdupois ounces. Ounce means the avoirdupois mass ounce, not a fluid or troy ounce.
WeightOunces to Grams
Convert an avoirdupois ounce value into grams. Ounce means the avoirdupois mass ounce, not a fluid or troy ounce.
WeightKG to Stone
Express a kilogram body-mass or reporting value as decimal stone. The stone is defined here as 14 avoirdupois pounds.
WeightStone to KG
Return decimal stone to kilograms. The stone is defined here as 14 avoirdupois pounds.
Related Guides
These references explain mass units, metric and imperial reporting, rounding, shipping limits, bodyweight, and small-measurement use cases.
All 18 Tools In This Category
KG to LBS
Translate a metric scale or specification into avoirdupois pounds. The international avoirdupois pound is exactly 0.45359237 kg.
WeightLBS to KG
Return an avoirdupois pound value to the SI kilogram. The international avoirdupois pound is exactly 0.45359237 kg.
WeightGrams to Ounces
Express a small metric mass in avoirdupois ounces. Ounce means the avoirdupois mass ounce, not a fluid or troy ounce.
WeightOunces to Grams
Convert an avoirdupois ounce value into grams. Ounce means the avoirdupois mass ounce, not a fluid or troy ounce.
WeightKG to Grams
Expand a kilogram mass into grams for smaller-scale reporting. SI decimal scaling.
WeightGrams to KG
Scale a gram mass into kilograms without changing the measured quantity. SI decimal scaling.
WeightPounds to Ounces
Break a pound mass into avoirdupois ounces. Avoirdupois mass system.
WeightOunces to Pounds
Combine avoirdupois ounces into pounds. Avoirdupois mass system.
WeightKG to Stone
Express a kilogram body-mass or reporting value as decimal stone. The stone is defined here as 14 avoirdupois pounds.
WeightStone to KG
Return decimal stone to kilograms. The stone is defined here as 14 avoirdupois pounds.
WeightStone to Pounds
Expand decimal stone into pounds. The stone is defined here as 14 avoirdupois pounds.
WeightPounds to Stone
Express pounds as decimal stone. The stone is defined here as 14 avoirdupois pounds.
WeightTons to KG
Convert bulk material mass from metric tonnes to kilograms. These established ton URLs mean metric tonne, not US short ton or UK long ton.
WeightKG to Tons
Scale kilograms into metric tonnes. These established ton URLs mean metric tonne, not US short ton or UK long ton.
WeightMG to Grams
Scale a small mass from milligrams into grams. SI decimal scaling for mass only.
WeightGrams to MG
Expand a gram mass into milligrams. SI decimal scaling for mass only.
WeightCarats to Grams
Convert gemstone or pearl mass from carats to grams. Metric carat for gemstones and pearls; carat is not gold purity karat.
WeightGrams to Carats
Express gemstone mass in metric carats. Metric carat for gemstones and pearls; carat is not gold purity karat.
Related Categories
Weight Converter FAQ
Mass-to-mass conversions are direct, but volume-to-weight cooking conversions depend on the ingredient density.
Use fewer decimals for bodyweight and shipping, and more precision for small masses such as jewelry or lab-style values.
Convert all values into one target unit first, then compare them to avoid double conversion and rounding mistakes.