converter
Weight Converter
Use the weight converter for kilograms, grams, pounds, ounces, stones, and metric tons in cooking, shipping, fitness, and everyday estimates.
Convert common weight and mass units for recipes, package estimates, fitness logs, product specs, and quick metric-imperial comparisons.
Quick answer
Enter the source value, choose its unit, and select the unit you need. The converter uses fixed conversion constants and shows results to a maximum of six decimal places. Use the result for everyday comparisons, then check the scale, carrier, medical, or laboratory rule that controls a real decision.
Result
Choose the weight check you need
Match the source label to the target unit first, then confirm whether another rule controls the final measurement or bill.
| Need | Use this converter for | Check separately |
|---|---|---|
| kg and lb | Luggage, package, fitness, and product-label comparisons. | Scale precision, label rounding, or carrier limits. |
| g and oz | Recipe amounts and small packaged goods. | Kitchen-scale accuracy and recipe rounding. |
| kg and stone | A reference comparison between two mass units. | Medical guidance and the measurement conditions of the source scale. |
| Volume to weight | Not supported by a unit-only weight conversion. | The material density and the exact volume unit are both required. |
How it works
Enter a value and choose the source and target units. Every conversion goes through grams as the canonical base unit before converting to the target unit, which keeps the formula path consistent. Results are useful for everyday checks, but labels, scales, carriers, labs, and product specifications may apply their own rounding or billing rules.
Examples
Metric to imperial
Input: 1 kilogram to pounds
Output: 2.204623 pounds
Imperial to metric
Input: 2 ounces to grams
Output: 56.699046 grams
Shipping estimate
Input: 5 pounds to kilograms
Output: 2.267962 kilograms
Recipe amount
Input: 250 grams to ounces
Output: 8.81849 ounces
Body weight
Input: 70 kilograms to stone
Output: 11.023113 stone
Luggage check
Input: 23 kilograms to pounds
Output: 50.70632 pounds
Ingredient package
Input: 500 grams to pounds
Output: 1.102312 pounds
FAQ
Which units are supported?
Milligram, gram, kilogram, metric ton, ounce, pound, and stone.
Are negative values allowed?
Yes. Negative values can be useful for differences or adjustments.
Does this use live data?
No. Weight conversion uses fixed unit constants.
What base unit does the converter use?
The converter normalizes values through grams before converting to the selected target unit.
Can I use this for recipes?
Yes, it is useful for quick recipe conversions, but confirm rounding with your kitchen scale when precision matters.
Why are some results long decimals?
Metric and imperial weight units rarely divide evenly, so the tool keeps up to six decimal places for transparent conversion checks.
Can I convert the same unit to itself?
Yes. Choosing the same source and target unit returns the original value.
Can I use this for postage or freight billing?
Use it as a conversion helper only. Carriers can bill by dimensional weight, rounded units, zones, or service-specific rules.
Is weight the same as mass?
Everyday tools often use the words together. This converter uses fixed mass-unit constants and does not model gravity, force, or scientific measurement conditions.
Can this convert volume to weight?
No. Converting volume to weight requires the material density and an exact volume measurement; different materials can weigh very different amounts at the same volume.
Does this calculate shipping billable weight?
No. It converts mass units only. A carrier may compare scale weight with dimensional weight, then apply service-specific rounding, package, and zone rules.
Is this suitable for medical or laboratory decisions?
No. Use calibrated equipment and the applicable medical or laboratory procedure when measurement precision affects health, safety, or controlled work.