Convert weight and mass instantly between milligrams, grams, kilograms, ounces, pounds, and metric tons. Type a value, pick units, and see all 6 conversions live - all processing stays in your browser.
Technical Specifications
Conversion factors and display rules used for every calculation.
| Specification |
Details |
| Supported units |
Milligram (mg), Gram (g), Kilogram (kg), Ounce (oz), Pound (lb), Metric Ton (t) - 6 units |
| Base unit |
Kilogram (kg). All conversions go through kilograms: value -> kilograms -> target. |
| Factors to kilogram |
mg 0.000001, g 0.001, kg 1, oz 0.028349523125, lb 0.45359237, t 1000 |
| Formula |
result = amount x (fromFactor / toFactor) |
| Precision |
Double precision (IEEE 754). Display up to 9 decimal places, trailing zeros trimmed; exponential for |n| >= 1e12 or |n| < 1e-6 |
| Input handling |
Commas ignored, decimal points accepted, negatives allowed. Empty or invalid shows helper message. Update is live on input. |
| Matrix |
Every keystroke also recomputes the All Units grid: input amount shown in all 6 units relative to the From unit. |
| Processing location |
100% client-side JavaScript in your browser memory; nothing is uploaded |
| Export |
Copy result to clipboard or download a plain-text report with inputs, result, and all-units table |
| Usage limit |
None - run unlimited conversions for free, no signup required |
Understanding Weight Units
Weight bridges metric and imperial history. The kilogram is the SI base unit, defined by the Planck constant, while the pound is defined as exactly 0.45359237 kilograms since 1959. That single definition ties the two systems together so every conversion is exact.
Metric: milligrams to metric tons
Metric weights scale by thousands: 1000 milligrams make a gram, 1000 grams make a kilogram, and 1000 kilograms make a metric ton. Labs use milligrams for chemicals, kitchens use grams, people use kilograms for body weight, and shipping uses metric tons. The decimal structure makes mental math simple - shift the decimal point by three.
Imperial: ounces and pounds
Imperial weight uses avoirdupois: 16 ounces make a pound, and 2000 pounds make a short ton (US) while 2240 pounds make a long ton (UK). US recipes use ounces, people use pounds for body weight, and freight uses tons. Because one ounce is exactly 28.349523125 grams and one pound is exactly 453.59237 grams, conversions remain exact, not approximate. This tool uses metric tons (1000 kg) as the large unit for consistency.
When to use which unit
Use milligrams and grams for small quantities like medicine or ingredients, kilograms for body weight and parcels, and metric tons for vehicles and bulk goods. Use ounces and pounds for US cooking and everyday weighing. If a project spans both systems, convert through kilograms with the factor fromFactor / toFactor - for example kilograms to pounds multiplies by 2.204622622.
Honest limitations
Display rounding hides trailing noise but near extremes precision is limited by double floating point. Values beyond 1e12 kilograms switch to exponential form to keep the display readable. The tool does not handle stones, carats, or troy ounces - for those, use the specialized Length Converter or Volume Converter patterns.
Privacy and Client-Side Security
Privacy Guarantee: All conversions occur locally inside your browser. Your numbers and selected units are never transmitted, stored, or recorded on remote servers.
Many online converters send your inputs to a server for lookup, which is unnecessary for fixed-factor math. TinyToolzz keeps everything in-page: factor tables, multiplication, and formatting run with plain JavaScript number operations.
Because nothing is uploaded, there is no waiting, no account, and no copy of your figures retained anywhere. Your values exist only in the tab's memory and are discarded when you close the page or click Clear.