Weight Converter
Convert weights between kilograms, pounds, ounces, grams, stones, and more.
How to use Weight Converter
Enter your weight value
Type the numerical weight amount in the input field labeled 'From'. For example, enter '75' to convert 75 kilograms. The field accepts decimal values up to 2 decimal places.
Select your starting unit
Click the dropdown menu next to the input field that says 'Select unit'. Choose from Kilograms (kg), Pounds (lbs), Ounces (oz), Grams (g), Stones (st), or Metric Tonnes (t). Your selection appears highlighted in blue.
Choose your target unit
Click the second dropdown menu labeled 'Convert to' and select your desired weight unit. The converter supports the same 6 unit options. Your choice appears immediately in the field.
View instant conversion result
The converted weight displays automatically in the output field below. The result shows up to 4 decimal places for precision. Copy the result using the 'Copy' button next to the output field, or click 'Reset' to start a new conversion.
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Weight converter, convert kg, pounds, ounces, grams instantly
Weight converter, convert kg, pounds, ounces, grams instantly
Need to convert between kilograms and pounds, or grams and ounces? Use ToolHQ's free weight converter to convert between all major weight units instantly with no signup required.
ToolHQ's weight converter is a free browser-based tool that converts between kilograms, pounds, ounces, grams, stones, and metric tons simultaneously, with all values updating instantly as you type.
Weight unit confusion is everywhere: US recipes use ounces and pounds, international recipes use grams and kilograms, and medical records often list weight in different units depending on the country. This tool resolves it in seconds.
Key Takeaways
- Converts between 6 units simultaneously: kilograms, pounds, ounces, grams, stones, and metric tons
- All units update the moment you enter a value in any field
- Based on exact international conversion standards (1 pound = 453.59237 grams exactly)
- No rounding errors from chaining conversions: each unit calculates directly from the input
- Free with no login and no usage limits
How weight conversion works
Weight measurement uses two main systems: the SI (metric) system based on the kilogram, and the US/imperial system based on the pound.
The key conversion relationships:
- 1 kilogram (kg) = 1,000 grams (g)
- 1 pound (lb) = 453.59237 grams (exact, by international definition since 1959)
- 1 pound = 16 ounces (oz)
- 1 stone = 14 pounds = 6.35029 kg (used primarily in UK for body weight)
- 1 metric ton (tonne) = 1,000 kg = 2,204.62 pounds
According to the NIST weights and measures documentation, the US uses a customary system for everyday measurement while scientific and international trade applications use SI units. The pound-kilogram relationship has been exact since the 1959 International Yard and Pound Agreement.
The Wikipedia article on the kilogram notes that the kilogram was redefined in 2019 in terms of Planck's constant, making it one of the most precisely defined units in physics. For everyday conversion purposes, the traditional relationship of 1 pound = 453.59237 grams remains the standard reference.
When you need to convert weight units
Weight conversions appear in cooking, health, shipping, travel, and scientific contexts daily.
Mini-story: Brigitte is a 38-year-old home cook who follows international recipes. She found a German bread recipe calling for 350 grams of flour and 250 grams of water, but her kitchen scale only has a pounds/ounces mode. She opened ToolHQ's weight converter, entered 350 in the grams field, and saw it was 12.35 ounces. She entered 250 grams and got 8.82 ounces. She measured both successfully in under two minutes and the bread came out exactly right.
Common situations where a weight converter is useful:
- Following recipes that use different weight unit systems
- Converting body weight from kg to pounds (or stones) for health forms, apps, or discussions
- Checking shipping weight requirements when online stores list limits in different units
- Converting product weights for international e-commerce listings
- Converting laboratory or medical specimen weights between metric and US units
How to use the weight converter
- Open ToolHQ's weight converter in your browser.
- Enter a value in any field. Type the number in the unit you know -- kilograms, pounds, ounces, grams, stones, or metric tons.
- All other fields update instantly. Every unit shows its equivalent as you type.
- Read the unit you need from the corresponding field.
Common weight conversions reference
| From | To | Result |
|---|---|---|
| 1 kilogram (kg) | pounds | 2.205 lbs |
| 1 pound (lb) | kilograms | 0.4536 kg |
| 1 ounce (oz) | grams | 28.35 g |
| 1 gram (g) | ounces | 0.03527 oz |
| 1 stone | kilograms | 6.350 kg |
| 1 stone | pounds | 14 lbs |
| 1 metric ton (tonne) | kilograms | 1,000 kg |
| 1 metric ton (tonne) | pounds | 2,204.6 lbs |
| 100 grams | ounces | 3.527 oz |
| 500 grams | pounds | 1.102 lbs |
Body weight conversions:
- 50 kg = 110.2 lbs = 7 st 12 lbs
- 60 kg = 132.3 lbs = 9 st 6 lbs
- 70 kg = 154.3 lbs = 10 st 13 lbs
- 80 kg = 176.4 lbs = 12 st 8 lbs
- 90 kg = 198.4 lbs = 14 st 2 lbs
Cooking conversions:
- 100g = 3.53 oz
- 250g = 8.82 oz
- 500g = 1.10 lbs / 17.64 oz
- 1 kg = 2.205 lbs / 35.27 oz
Stones: The stone is used primarily in the UK and Ireland for expressing human body weight. 1 stone = 14 pounds = 6.35 kg.
When each unit system is used
The weight unit you use depends entirely on context. Knowing which system applies to your situation saves you from working in the wrong units.
Cooking and recipes: US recipes use ounces and pounds for most measurements. European and international recipes use grams and kilograms. Professional baking almost universally uses grams because they are more precise (you can measure 3g of yeast; measuring a fraction of an ounce is impractical).
Medicine: Medical weight in the US is recorded in kilograms for most clinical purposes, including drug dosing, which is typically calculated per kilogram of body weight. Patients often know their weight in pounds, which requires conversion during intake.
International shipping: Shipping carriers use kilograms for parcel weight internationally. The US also accepts pounds for domestic shipments. When filling out international customs forms, kilograms are the expected unit.
Aviation: Aircraft weight limits, fuel loads, and cargo manifests use kilograms in most of the world. US aviation historically used pounds, and you will still see weights stated in pounds in US-registered aircraft documentation.
Fitness and body weight: In the US, body weight is almost always discussed in pounds. In the UK and Ireland, stones and pounds are conventional for body weight in informal conversation, while kg is used in medical settings. Australia, Canada, and most other countries use kilograms exclusively.
Mini-story: Kwame, a 29-year-old who recently moved from Ghana to the UK, was confused when his GP's office told him his weight was "12 stone 4 pounds." He entered his known weight of 78 kg into the weight converter, which showed 12.28 stones. He confirmed this converts to 12 stones and 0.28 x 14 = 3.9 pounds -- so 12 stones 4 pounds, which matched exactly. He now understood his weight in the local unit used by UK healthcare providers.
For BMI calculations using your weight and height, try ToolHQ's BMI calculator. For length/height conversions, use the length converter. Browse all converter tools in the ToolHQ converter category.
Frequently asked questions
How accurate are the weight conversions?
The conversions use the international standard: 1 pound = 453.59237 grams exactly. Results are accurate to at least 5 significant figures for all practical purposes.
What is a stone and who uses it?
A stone equals 14 pounds (6.35 kg). It's used primarily in the United Kingdom and Ireland, mainly for expressing human body weight. The unit is not used in most other countries.
What is the difference between mass and weight?
Scientifically, mass (measured in kg) is the amount of matter in an object, while weight is the force of gravity on that mass. In everyday use, the terms are used interchangeably for the same measurement.
Can I convert metric tons and short tons?
Yes, if the tool includes metric tons (tonne = 1,000 kg). Note that US "short tons" (2,000 lbs) differ from metric tons (2,205 lbs). Check whether you need a metric ton or short ton for your specific context.
Does this convert troy ounces (used for precious metals)?
Standard ounces (avoirdupois ounces, 28.35g) are used for everyday weight. Troy ounces (31.10g) are used for gold, silver, and other precious metals. If you need troy ounces, note that 1 troy oz = 31.10g, not 28.35g.
The short version
Kilograms, pounds, grams, ounces, stones -- weight units are different across countries, industries, and contexts. ToolHQ's weight converter converts between all six major weight units simultaneously the moment you enter any value. No chained calculations, no rounding drift, no signup.
Type one value, read all the others. Done.
For body mass index calculations, use ToolHQ's BMI calculator. For length conversions, use the length converter. Browse all tools at the ToolHQ converter category.