Weight Calculator

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Weight Calculator & Converter
Kilograms (kg)Pounds (lb)Grams (g)Ounces (oz)Stone (st)Milligrams (mg)
Conversion Results:
function calculateWeight(){var val=parseFloat(document.getElementById('weight_input').value);var unit=document.getElementById('unit_type').value;var showSteps=document.getElementById('steps').checked;if(isNaN(val)){alert('Please enter a valid weight value');return;}var g;if(unit==='kg'){g=val*1000;}else if(unit==='lb'){g=val*453.592;}else if(unit==='g'){g=val;}else if(unit==='oz'){g=val*28.3495;}else if(unit==='st'){g=val*6350.29;}else if(unit==='mg'){g=val/1000;}var kg=g/1000;var lb=g/453.592;var oz=g/28.3495;var st=g/6350.29;var mg=g*1000;var resHTML='
';resHTML+=''+val+' '+unit+' is equal to:
';resHTML+='Metric: '+kg.toFixed(4)+' kg | '+g.toFixed(2)+' g | '+mg.toFixed(2)+' mg
';resHTML+='Imperial: '+lb.toFixed(4)+' lbs | '+oz.toFixed(2)+' oz | '+st.toFixed(4)+' stone
';if(showSteps){resHTML+='
Conversion Logic:
';if(unit==='kg'){resHTML+='1 kg = 2.20462 lbs
Calculation: '+val+' × 2.20462 = '+lb.toFixed(4)+' lbs';}else if(unit==='lb'){resHTML+='1 lb = 0.453592 kg
Calculation: '+val+' × 0.453592 = '+kg.toFixed(4)+' kg';}resHTML+='
';}document.getElementById('answer').innerHTML=resHTML;}

How to Use the Weight Calculator

The weight calculator is a versatile tool designed to provide instant conversions between the most common units of mass and weight used globally. Whether you are shipping a package, following a recipe from another country, or tracking your fitness progress, this tool ensures you have accurate data in the unit of your choice.

To get started, follow these simple steps:

Choose Base Unit
Select the unit you currently have (e.g., Kilograms if you are weighing yourself on a metric scale).
Enter Weight
Type the numerical value into the input field. You can use decimals for precise measurements.
Show Conversion Formulas
Check this box if you want to see the specific math used to reach the result.

How It Works: The Mathematics of Weight

Weight conversion relies on fixed constants. While "weight" technically refers to the force of gravity on an object and "mass" refers to the amount of matter, in everyday commerce and science, we treat these units as interchangeable on Earth. The formula used for any conversion is:

Target Value = Input Value × Conversion Factor

  • Kilograms to Pounds: Multiply by 2.2046226218
  • Pounds to Kilograms: Multiply by 0.45359237
  • Ounces to Grams: Multiply by 28.3495231
  • Stone to Pounds: Multiply by 14

Practical Conversion Examples

Example 1: Cooking Conversion

You are following a European recipe that calls for 500 grams of flour, but your kitchen scale only measures in ounces.

  1. Input Weight = 500
  2. Base Unit = Grams (g)
  3. Formula: 1 gram = 0.035274 ounces
  4. Calculate: 500 × 0.035274
  5. Result = 17.64 oz

Example 2: Personal Weight

An athlete weighs 185 pounds and wants to know their mass in kilograms for a medical assessment.

  1. Input Weight = 185
  2. Base Unit = Pounds (lb)
  3. Formula: 1 lb = 0.453592 kg
  4. Calculate: 185 × 0.453592
  5. Result = 83.91 kg

Common Weight Questions

What is the difference between Metric and Imperial weight?

The Metric system (used by most of the world) uses kilograms and grams, based on powers of ten. The Imperial system (primarily used in the US) uses pounds and ounces. The UK often uses a hybrid, including "stones" (1 stone = 14 lbs) for body weight.

How many ounces are in a pound?

There are exactly 16 ounces in 1 pound. When converting to grams, 1 pound is approximately 453.59 grams, and 1 ounce is approximately 28.35 grams.

Why does the Weight Calculator show so many decimals?

Precision is vital in scientific and pharmaceutical contexts. While a baker might only need two decimal places, a lab technician might need four or more. Our weight calculator provides high-precision results to accommodate all users.

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