Built and fact-checked by the DocNectar team — see our editorial standards
Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
Fully responsive design. Works on all devices & screen sizes.
Privacy Focused
Your data stays on your device. We don't store any inputs.
100% Free
No hidden costs. This tool is completely free forever.
Recipes in grams, body weight in pounds, shipping labels in kilograms, gym plates in stone — weight (technically mass) units vary by country and context, and converting between them accurately matters for cooking, fitness, medicine, and shipping alike. A recipe written for a European audience will list flour and sugar in grams, while many US recipes still use ounces and pounds; body weight is tracked in kilograms in most of the world but in pounds in the US and in stone in the UK and Ireland. Getting these conversions wrong isn't just an inconvenience — a shipping quote based on the wrong weight unit can under- or overestimate cost by a large multiple, and a medication dose calculated per kilogram of body weight needs an accurate kg figure even if the patient's chart is recorded in pounds. This tool converts between seven common weight units — milligrams, grams, kilograms, metric tons, ounces, pounds, and stone — using precise standard conversion factors rather than rounded rules of thumb.
How it works
Every supported unit is internally defined as a fixed multiple of a single base unit (grams). Enter a value, choose the unit you're converting from and the unit you want to convert to, and the tool first converts your input into grams, then converts that base value into your target unit. Routing every conversion through one shared base means the tool only needs one precise factor per unit, rather than a separate formula for every possible pairing of the seven supported units — and it's why the result stays accurate no matter which two units you pick.
- Enter value.
- Enter from.
- Enter to.
- Click Calculate to see your results.
Examples
Converting body weight
1 kilogram converts to about 2.20462 pounds, or roughly 0.1575 stone — the standard conversion used for comparing body weight between metric and imperial systems.
Converting a recipe ingredient
250 grams of flour converts to about 8.82 ounces — handy when following a European recipe using a US kitchen scale set to ounces.
Converting a shipping weight
A 25 kilogram parcel converts to about 55.12 pounds, or 0.025 metric tons — useful when a courier's rate table is quoted in a different unit than your scale.
Who should use it
- Converting recipe ingredient weights between grams and ounces.
- Converting body weight between kilograms, pounds, and stone.
- Converting a parcel or freight weight for a shipping quote in a different unit system.
- Converting a medication dose reference weight between kilograms and pounds.
Industry applications
- Cooking and recipe development
- Shipping and logistics
- Healthcare and fitness tracking
Advantages
- Supports seven common metric and imperial weight units, including stone.
- Uses precise, standard conversion factors rather than rounded approximations.
- Handles any combination of the seven units through a single consistent method.
Limitations
- Uses metric tons only, not US short tons or UK long tons.
- Doesn't distinguish between mass and force/weight (newtons), which is a different physical quantity.
Common mistakes to avoid
- Confusing a US ton (short ton, 2,000 lb) with a metric ton (1,000 kg) — this tool uses metric tons, which are about 10% heavier than a US short ton.
- Mixing up stone and pounds when reading UK body-weight figures — "11 stone" is 154 pounds, not 11 pounds.
- Rounding too early in a multi-step conversion, which compounds small errors into a noticeably wrong final figure.
- Assuming ounces for weight (avoirdupois ounces) are the same as fluid ounces for volume — they measure different things entirely.
Best practices
- Double-check whether a source uses metric or imperial tons before converting, since they differ by roughly 10%.
- For cooking, convert to grams rather than ounces when precision matters — gram scales typically have finer resolution.
- Keep at least one or two decimal places in body-weight conversions, since a rounded kilogram figure can shift a pound conversion by a noticeable amount.
Tips
- For cooking, gram measurements are generally more precise than volume-based cups for dry ingredients.
- When comparing body weight across countries, converting to kilograms first gives the most universally understood figure.
- For shipping, always confirm whether a carrier's rate table uses metric or imperial units before converting your parcel weight.