Weight Converter
Convert grams, kilograms, tonnes, milligrams, pounds, ounces and carats. Add several items to calculate their total weight.
Frequently Used
This free weight converter instantly converts between grams, kilograms, tonnes, pounds, ounces and carats. Get answers to the most-searched conversions — pounds to kg, kg to pounds, ounces to grams, grams to kg, kg to grams and carat to gram — with internationally standardized factors, all in your browser.
Weight Conversion and Weight Units — How Many Kg Is 1 Ton?
Weight conversion is a basic operation needed in many areas, from everyday life to industry. One of the most frequently asked questions is 1 ton in kg (how many grams in a kg too): 1 tonne = 1,000 kilograms, and 1 kg = 1,000 grams. In the metric system, tonne, kilogram and gram are related to each other by factors of 1,000, so conversions are highly systematic.
Weight units are used worldwide in two main systems: the metric system (gram, kilogram, tonne) and the imperial system (pound, ounce). Most of the world adopts the metric system, while the United States and some English-speaking countries continue to use pounds and ounces.
Units of Weight — Gram-Based Conversion Table
The table below shows all units of weight and their equivalents in grams. The values in the table are the internationally standardized factors.
| Unit | Equivalent in Grams | Example Conversion |
|---|---|---|
| 1 Milligram (mg) | 0.001 g | 1,000 mg = 1 g |
| 1 Gram (g) | 1 g | Base unit |
| 1 Kilogram (kg) | 1,000 g | 1 kg = 1,000 g |
| 1 Tonne (t) | 1,000,000 g | 1 tonne = 1,000 kg |
| 1 Pound (lb) | 453.592 g | 1 lb ≈ 453.6 g; 1 kg ≈ 2.205 lb |
| 1 Ounce (oz) | 28.3495 g | 16 oz = 1 lb |
| 1 Carat (ct) | 0.2 g | 5 carats = 1 g |
Common Weight Conversions: Pounds, Ounces, Grams and Carats
Here are the most frequently searched conversions, each with its exact factor:
- Pounds to kg: 1 lb = 0.453592 kg, so multiply pounds by 0.4536. Example: 150 lb = 68 kg.
- Kg to pounds: 1 kg = 2.20462 lb. Example: 70 kg = 154.3 lb.
- Ounces to grams: 1 oz = 28.3495 g. Example: 8 oz = 226.8 g.
- Grams to kg: divide grams by 1,000. Example: 2,500 g = 2.5 kg.
- Kg to grams: multiply kg by 1,000. Example: 4 kg = 4,000 g.
- Carat to gram: 1 carat = 0.2 g, so 5 carats = 1 g — used for gemstones and jewellery.
Converting Kilograms to Grams and the Weight Formula
Converting kilograms to grams is extremely simple: grams = kg × 1,000. For example, 3.5 kg = 3,500 grams and 0.25 kg = 250 grams. Conversely, divide the gram value by 1,000 to get kilograms: 750 g ÷ 1,000 = 0.75 kg.
The weight formula in physics is expressed as F = m × g. Here F is the weight force in newtons (N), m is the mass in kilograms and g ≈ 9.81 m/s² is gravitational acceleration. For example, the weight of a 70 kg body is 70 × 9.81 = 686.7 N. Although "weight" is used colloquially instead of "mass," this tool covers unit conversion and calculation for both concepts.
What Is the Unit of Weight? How Is Weight Measured?
The question what is the unit of weight has two answers. In physics the SI unit of weight is the newton (N), because weight is a force. In daily life and commerce, weight is expressed in kilograms (kg) or grams (g). As for how weight is measured: an analytical balance is used for precise measurements, a digital kitchen scale for cooking, an electronic platform scale for industrial measurements, and a dynamometer for force measurement.
The most widely used unit in international trade and food labeling is the kilogram. Because the pound (lb) and ounce (oz) are common in the United States, the kg ↔ lb conversion is an important need in international shopping.
What Is Net Weight? The Difference from Gross Weight
The question what is net weight is especially critical in food, shipping and import-export processes. Net weight is the weight of the product itself only, excluding packaging or container. Gross weight is the total weight including packaging and wrapping materials. The packaging weight, also called tare weight, is calculated with the formula: Tare = Gross weight − Net weight.
- Food labels: A yogurt with 500 g net weight may have a gross weight of 540 g with its packaging.
- Shipping: If the package contents are 2 kg and the box plus padding are 0.5 kg, the gross weight is 2.5 kg.
- Import-export: Net and gross weight must be declared separately on customs declarations.
- Industry: Tare weight is stated separately for chemical drums, metal cylinders and tanks.
Uses of the Weight Converter
This weight converter offers two functions: a unit-converter mode and a total-weight mode. Common use scenarios are listed below:
- Cooking and recipes: Convert between grams, kilograms and ounces to adapt international recipes to local measures.
- Shipping and logistics: Calculate the total weight of several packages to estimate shipping cost in advance.
- Jewelry and gemstones: Instantly find the carat-to-gram equivalent of diamonds and precious stones.
- Sport and fitness: Track body weight in different units with pound-kilogram conversion.
- Construction and industry: For material weight calculation, sum material amounts in tonnes and kilograms.
- International shopping: Convert the pound/ounce weight of products ordered from the US to kilograms and grams.
Pound and Ounce: Imperial Weight Units
The pound (lb) and ounce (oz) are the basic weight units of the imperial measurement system. These units are widely used especially in the US, the United Kingdom and Canada. The equivalence 1 pound = 16 ounces = 453.592 grams is set as the international standard.
On online shopping sites (especially US-based), product weights are usually given in pounds and ounces. When you want to convert a product's weight to kilograms or grams, this tool lets you calculate with one click. Note that the troy ounce differs from the standard ounce: 1 troy ounce = 31.1035 grams and is used in precious-metal trading.
Frequently Asked Weight Conversion Questions
- How many grams in 1 kg? 1 kilogram = 1,000 grams.
- How many kg in 1 ton? 1 metric tonne = 1,000 kilograms = 1,000,000 grams.
- How many pounds in 1 kg? 1 kg ≈ 2.2046 pounds.
- How many kg in 1 pound? 1 lb ≈ 0.4536 kg (453.6 grams).
- How many grams in 1 ounce? 1 oz = 28.3495 grams.
- How many grams in 1 carat? 1 carat (ct) = 0.2 grams (200 milligrams).
- How many kg in 100 grams? 100 g = 0.1 kg.
- How many kg in 500 grams? 500 g = 0.5 kg.
How to Use This Weight Converter
The tool has two modes. In Unit Converter mode, enter the weight value and select the source unit; all equivalents in grams, kilograms, tonnes, milligrams, pounds, ounces and carats appear instantly. In Total Weight mode, add several items, assign a different unit to each, and calculate the total weight in grams, kilograms and tonnes. In the FAQ section you can find more information on the weight formula, what net weight is, and the unit of weight. Our weight converter serves a wide range of uses — from import-export declarations to diet and sport tracking, from cargo shipments to laboratory measurements — and prevents calculation errors by converting different units automatically.
Frequently Asked Questions About the Weight Converter
1 tonne = 1,000 kilograms. Also known as the metric ton, in this unit 1 tonne = 1,000 kg = 1,000,000 grams (1 million grams). For example, 2.5 tonnes = 2,500 kg.
In physics the weight formula is F = m × g, where F is the weight force in newtons, m is the mass in kilograms and g ≈ 9.81 m/s² is gravitational acceleration. In everyday use, weight (mass) is expressed in grams or kilograms and conversion tables are used to change units.
In physics the SI unit of weight is the newton (N). In everyday life weight is expressed in kilograms (kg) or grams (g). Weight is measured with a scale, balance or dynamometer. For precise measurements an analytical balance is used.
Net weight is the weight of the product only, excluding packaging or container. Gross weight is the total weight including packaging. For example, a product with 1 kg net weight may show 1.15 kg gross weight with its packaging. This distinction matters on food labels and in shipping calculations.
To convert kilograms to grams, multiply the kg value by 1,000: grams = kg × 1,000. For example, 2.5 kg = 2,500 grams and 0.75 kg = 750 grams. Conversely, divide the gram value by 1,000 to get kilograms.
Common weight units: milligram (mg), gram (g), kilogram (kg), tonne (t) in the metric system; pound (lb) and ounce (oz) in the imperial system; carat (ct) for gemstones. In the SI system the base unit of mass is the kilogram.
Couldn't find the answer you were looking for?
Explore all our tools and get the fastest answer to your question.