Weight & Mass Converter
MeasurementFree online weight and mass converter. Convert between milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and Indian units like tola, maund, and quintal.
| Milligrams (mg) | 1000000 |
| Grams (g) | 1000 |
| Kilograms (kg) | 1 |
| Metric Tonnes | 0.001 |
| Ounces (oz) | 35.273991 |
| Pounds (lb) | 2.2046244 |
| Stone (st) | 0.15747312 |
| Tola | 85.735352 |
| Maund | 0.026792269 |
| Quintal | 0.01 |
What is a Weight?
A weight and mass converter is a tool that translates a measurement in one unit into its exact equivalent in another. Weight and mass are expressed using fundamentally different unit systems across the world, and all three coexist in daily Indian usage. A vegetable vendor weighs produce in kilograms, a jeweller prices gold in tolas, a commodity trader quotes grain in quintals, a gym tracks body weight in both kg and lb, and food packaging imported from the US shows mass in ounces. Moving between these systems without error requires precise conversion factors — and this is what the weight converter handles instantly.
The converter supports ten units: milligrams, grams, kilograms, metric tonnes (Metric group); ounces, pounds, stone (Imperial group); and tola, maund, quintal (Indian group). Unlike some converters that cover only metric and imperial, the inclusion of traditional Indian units makes this tool directly useful for gold and jewellery calculations, agricultural commodity pricing, and historical trade records. Entering a value in any field — From or To — updates the other immediately, and the reference table shows all ten unit equivalents at a glance.
The kilogram is used as the internal base unit for all conversions, consistent with the International System of Units (SI). Every unit's toBase factor is fixed and internationally defined where available (the ounce, pound, and stone are defined exactly in terms of the kilogram). For Indian traditional units, the metric-standardised values used in official trade documentation are applied. See the Formula section below for all factors.
For dimensional measurements alongside weight, the Length Converter covers millimetres through miles.
How to use this Weight calculator
Select your From unit — use the left unit dropdown. Units are grouped into Metric, Imperial, and Indian. The default opens at Kilograms.
Enter your value in the left input field. Type any number — decimals, large values, and small values (like milligrams) are all supported. The To field updates immediately.
Select your To unit — use the right unit dropdown. The default is Pounds. Change it to any other unit and the result recalculates instantly.
Type in the To field to convert in reverse — for example, enter 154 lb to see the equivalent in kg in the From field. The converter is fully bidirectional.
Swap the units using the arrow button between the two panels. This flips From and To while keeping the entered value, useful when you want to ask "how much is that in the other direction?"
Read the reference table below the converter for all unit equivalents at once. The row matching your From unit is highlighted. This is the fastest way to check a value across multiple systems simultaneously.
Share or bookmark — the page URL updates with every change, encoding your current conversion state. Send the link to a colleague and they open exactly the same result.
Formula & Methodology
All weight conversions use a single two-step formula via the kilogram as the common base: Result = (Input × F_from) ÷ F_to Where: - Input — the value entered in the From field - F_from — the conversion factor of the From unit to kilograms (toBase) - F_to — the conversion factor of the To unit to kilograms (toBase) - Result — the converted value in the To unit Unit conversion factors (toBase, in kilograms): - mg = 0.000001 - g = 0.001 - kg = 1 (base) - tonne = 1,000 - oz = 0.0283495 - lb = 0.453592 - stone = 6.35029 - tola = 0.0116638 - maund = 37.3242 - quintal = 100 Worked example 1 — Convert 10 tola of gold to grams: Result = (10 × 0.0116638) ÷ 0.001 Result = 0.116638 ÷ 0.001 Result = 116.638 grams At ₹6,500 per gram, 10 tola of gold = 116.638 g × ₹6,500 ≈ ₹7,58,147. The converter verifies the weight component of such pricing calculations. Worked example 2 — Convert 5 quintals to maunds (grain trade): Result = (5 × 100) ÷ 37.3242 Result = 500 ÷ 37.3242 Result ≈ 13.396 maunds A 5-quintal grain lot equals approximately 13.4 maunds — useful for records that reference the older maund-based weighing standard. Worked example 3 — Convert 80 kg (body weight) to pounds: Result = (80 × 1) ÷ 0.453592 Result = 80 ÷ 0.453592 Result ≈ 176.37 lb Source notes: The pound and ounce are defined by the international yard and pound agreement (1959) as exactly 0.45359237 kg and 0.028349523125 kg respectively. The stone is defined as exactly 14 lb. Tola is based on the British Indian standard of 180 troy grains = 11.66375 g (rounded to 0.0116638 kg). Maund uses the metric-standardised value of 37.3242 kg per the Indian Weights and Measures Act. Quintal is defined as exactly 100 kg by SI.