Weight & Mass Converter
MeasurementFree online weight and mass converter. Convert between milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and quintal instantly free.
Reviewed by the thecalcu.com team · Last updated June 28, 2026
| 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.
Why Use a Weight & Mass Converter?
Doing weight conversions manually works for simple cases like kg to lb, but breaks down quickly when you need an Indian unit like tola or maund. The factor for tola (0.0116638 kg) is not one most people have memorised, and even common conversions like ounces to grams (× 28.3495) are easy to invert accidentally.
This converter removes that friction across several practical situations:
- Jewellery and gold: Gold is priced and weighed in tolas by most Indian jewellers. If you see a price per gram from an international source, converting to tola instantly lets you compare against a local quote.
- Grocery and agriculture: Pulses, grains, and produce in wholesale mandis are sold by the quintal (100 kg). If you are buying for a restaurant or warehouse, knowing how many bags (each 50 kg) make a quintal avoids order errors.
- Health and fitness: Many gym apps, protein supplement labels, and foreign fitness trackers use pounds. Converting your body weight from kg to lb, or a supplement serving from grams to ounces, keeps your records consistent.
- International shipping: Package weight for courier services, airlines, and freight forwarders may need to be expressed in kg, lb, or both; this converter handles either direction.
- Recipe scaling: US and UK recipes quote ingredient quantities in ounces and pounds; Indian kitchens use grams and kg. Converting before you start prevents measurement errors mid-recipe.
Who Should Use This Calculator?
Jewellers, goldsmiths, and buyers quoting and recording gold, silver, and gemstone weights in tolas need to cross-reference international spot prices (quoted per gram or troy ounce) with local market pricing. This converter bridges the tola-gram-ounce triangle without approximation.
Farmers, commodity brokers, and procurement teams working with agricultural markets in India deal in quintals and maunds daily. Whether you are calculating how many quintals are in a truck-load (typically 10 tonnes = 100 quintals) or converting MSP rates from per-quintal to per-kg for retail pricing, this tool handles both.
Fitness enthusiasts, nutritionists, and healthcare professionals recording body weight in one system while reporting in another, Indian hospitals use kg, while some insurance and immigration forms ask for lb, benefit from instant bidirectional conversion.
Home cooks and bakers following international recipes that mix weight systems (US cups-and-ounces, British stones, metric grams) can standardise everything to grams or kilograms before starting.
Import/export businesses and logistics teams declaring cargo weight on shipping bills, air waybills, and customs documents need to move between kg, lb, and tonnes precisely; errors here carry regulatory consequences.
What Insights Does the Weight Converter Give You?
The To field displays the converted value at up to 8 significant figures. This level of precision matters in jewellery (where 0.01 gram differences in gold weight change invoice values meaningfully at ₹6,000+ per gram) and in pharmaceutical contexts where milligrams are critical.
The reference table shows all ten units simultaneously for the current From value. When you enter 1 kg, the table shows: 1,000,000 mg · 1,000 g · 1 kg · 0.001 tonne · 35.274 oz · 2.20462 lb · 0.157473 stone · 85.734 tola · 0.026792 maund · 0.01 quintal. This simultaneous view is especially useful for commodity and jewellery contexts where you may need to compare across all three unit families at once.
The swap button reverses From and To instantly, which is valuable when you receive a specification in an unfamiliar unit and want to express it in your working unit.
The URL encodes the current value, From unit, and To unit automatically. You can bookmark a specific conversion, for example, today's gold weight in tolas, and the link opens with exactly that state.
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.
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