Skip to content

Weight Converter

Convert between kilograms, pounds, ounces, grams, and more weight units online. Free mass converter with instant calculations.

Conversions
Milligrams
1000000mg
Grams
1000g
Kilograms
1kg
Ounces
35.273991oz
Pounds
2.204624lb
Stones
0.157473st
Metric Tons
0.001t

How to Use Weight Converter

1

Enter weight value

Type the weight and select source unit (kg, lb, oz, g, etc.).

2

Choose target unit

Select destination unit. Result appears instantly with proper precision.

3

Compare across systems

Verify metric ↔ imperial conversions. Helpful for fitness apps, cooking recipes, shipping, and international communication.

4

Note the unit context

Different industries use different units (troy oz for precious metals, stones for body weight in UK). Use the right unit for your context.

When to Use Weight Converter

Cooking and recipe scaling

International recipes use different units. US recipes use cups (volume) and lb/oz (weight); European recipes use grams. Convert recipes accurately when cooking dishes from different cuisines, or when scaling recipes up/down.

Fitness and weight tracking

Track weight loss/gain across different scales. UK uses stones (1 stone = 14 lb); US uses pounds; metric users use kilograms. Same weight, different numbers — the converter ensures consistent tracking.

Shipping and logistics

International shipping uses kg primarily; US domestic uses lb. Calculate shipping costs accurately by converting between systems. Avoid surprise charges from underestimated weights.

Industrial and agricultural weights

Agriculture uses tons (sometimes ambiguous between short, long, metric). Industries use specific units (carats for diamonds, troy ounces for precious metals). The converter handles these specialized contexts.

Weight Converter Examples

Body weight conversion

Input
150 lb
Output
68.04 kg = 10 stones 10 lb = 2400 oz

Standard adult body weight in different systems. Useful for fitness apps that mix systems, medical contexts (drug dosing in kg), and international travel where weight is reported in different units.

Cooking weight

Input
2 cups flour ≈ 250 g
Output
8.8 oz = 0.55 lb

Cups (volume) to grams (weight) is approximate since it depends on the ingredient density. The calculator converts weights only; for volume-to-weight, refer to ingredient-specific charts (flour, sugar, water all weigh differently per cup).

Precious metals

Input
1 troy ounce gold
Output
31.10 g = 1.097 oz (avoirdupois)

Troy ounce (precious metals) is heavier than regular ounce (food, weight). Always use troy oz when buying gold/silver. Difference: 31.10g (troy) vs 28.35g (avoirdupois).

Tips & Best Practices for Weight Converter

  • 1.Always specify the unit clearly in international communication. '5 tons' could mean 4.5 metric tons or 5 short tons or 5.6 long tons depending on context.
  • 2.For precious metals, always use troy ounces. Buying 'an ounce of gold' at avoirdupois weight (28.35g) when the seller means troy (31.1g) is a 9% discount unintentionally.
  • 3.When tracking body weight, pick one system and stick with it. Switching between systems (kg one week, lb the next) makes it harder to see trends.
  • 4.Cooking weight conversions are simpler than volume conversions (which depend on ingredient). Weight is universal: 100g of any substance = 100g.
  • 5.Postal services calculate shipping by weight AND dimensional weight (volume × density factor). Knowing both helps optimize shipping cost.
  • 6.Common reference points: 1 kg ≈ 2.2 lb, 1 lb ≈ 0.45 kg, 1 stone = 14 lb. Helps quickly estimate without a calculator.

Frequently Asked Questions

Common units: kilograms (kg), grams (g), milligrams (mg), pounds (lb), ounces (oz), tonnes (metric ton, 1000 kg), short tons (US, 2000 lb), and long tons (UK, 2240 lb). Also: stones (UK weight, 14 lb), troy ounces (precious metals, 31.1g vs 28.35g for regular oz).