🏋️ Weight Converter
Convert any mass measurement across metric and imperial units with a single tool.
From micrograms to tons, this converter keeps every mass unit aligned. Select your starting unit, choose the target unit, and reference additional conversions without re-entering the value.
Positive and decimal values are supported.
1 Kilograms (kg) equals
2.205 Pounds (lb)
Additional Conversions
Micrograms (µg)
1,000,000,000
Milligrams (mg)
1,000,000
Grams (g)
1,000
Decagrams (dag)
100
Kilograms (kg)
1
Ounces (oz)
35.274
US Tons (ton)
0.001102
Grains (gr)
15,432.36
Stones (st)
0.157
How to Use This Calculator
Enter the mass
Type the value you have—micrograms, kilograms, pounds, tons, or any supported unit.
Select source and target units
Choose the measurement units you’re converting from and to. The result updates instantly.
Copy additional equivalents
Use the quick conversion cards to grab other unit conversions without repeating the input.
Formula
Converted Value = Input × (Conversion factor from source to kilograms) ÷ (Conversion factor from target to kilograms)
The converter uses kilograms as the base unit, ensuring accuracy when chaining conversions across metric and imperial systems.
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Weight and mass conversions power everything from medication dosing to package shipping and manufacturing. This converter supports the most common units—micrograms, milligrams, grams, decagrams, kilograms, ounces, pounds, and US tons—so you can collaborate across scientific, culinary, and industrial workflows.
Because every conversion routes through kilograms, you avoid rounding drift even when converting between very small and very large units. The quick-results list saves time when you need multiple equivalents for reports or labels.
Link this tool with the mg to mL Calculator or Pounds and Ounces Calculator when working with mass-to-volume conversions or mixed imperial formats.
Frequently Asked Questions
Are the conversions exact?
Yes. The calculator uses internationally recognised conversion factors (e.g., 1 lb = 0.45359237 kg, 1 oz = 28.349523125 g).
How do I convert to stones or tonnes?
Stones and metric tonnes aren’t included by default. You can extend the `MASS_UNITS` configuration to add them or use the base kilogram output for quick manual calculations.
Can I convert negative values?
Negative inputs are accepted mathematically, but weights are typically non-negative. Use positive values for physical measurements.
Does it handle extremely large or small numbers?
Yes. The converter leverages JavaScript number precision, which covers most scientific and industrial scenarios.