Convert between kilograms, pounds, ounces, grams, stones, and metric tons with precision accuracy. Perfect for cooking, science, fitness, and everyday weight measurements.
Accurate weight conversion is essential for cooking, science, fitness, and international commerce. Our calculator uses precise conversion factors based on international standards to ensure reliable results across different measurement systems.
Kilograms (kg), grams (g), milligrams (mg), metric tons (t). Based on decimal system: 1 kg = 1000 g = 1,000,000 mg. Used worldwide for scientific and everyday measurements.
Pounds (lb), ounces (oz), US tons (short tons). 1 lb = 16 oz, 1 US ton = 2000 lb. Commonly used in United States for commercial and personal measurements.
Stones (st), pounds, ounces, UK tons (long tons). 1 stone = 14 lb, 1 UK ton = 2240 lb. Traditionally used in United Kingdom for body weight and goods.
Uses exact conversion factors: 1 kg = 2.20462262185 lb, 1 lb = 0.45359237 kg. Essential for scientific research, pharmacy, and precision engineering.
Mass is constant regardless of gravity, while weight varies with gravitational force. For practical Earth-based conversions, we treat them equivalently using standard gravity (9.8 m/s²). Our calculator provides precise conversions suitable for everyday use, cooking, and most scientific applications. For space or high-precision scientific work where gravity varies significantly, mass measurements (kilograms) should be used instead of weight.
Our calculator uses internationally recognized conversion factors with high precision: 1 kg = 2.20462262185 pounds, 1 pound = 0.45359237 kg, 1 ounce = 28.349523125 grams. These are based on international standards (NIST, BIPM) and provide accuracy suitable for scientific, commercial, and pharmaceutical applications. The precision exceeds typical kitchen scale accuracy by several orders of magnitude.
There are three main ton measurements: Metric ton (1000 kg), US ton/short ton (2000 lb ≈ 907.185 kg), and UK ton/long ton (2240 lb ≈ 1016.047 kg). The metric ton is used worldwide in science and international trade. US tons are common in American commerce, while UK tons are used in Britain and some Commonwealth countries. Always specify which ton you're using to avoid confusion in international contexts.
Stones are commonly used for body weight in the UK. One stone equals 14 pounds. To convert stones to pounds, multiply by 14. To convert pounds to stones, divide by 14. For example: 10 stone = 140 lb, 154 lb = 11 stone. Our calculator handles these conversions automatically and can display results in combined format (e.g., 11 stone 4 lb) for body weight measurements.
For small weights (under 100 grams), use grams or ounces with precision scales. Milligrams are used for very small measurements like medication. Digital kitchen scales typically measure to 1-gram precision, while laboratory scales can measure milligrams. When converting small weights, our calculator maintains precision up to 6 decimal places to ensure accuracy for scientific and pharmaceutical applications.
Absolutely! Our calculator is perfect for cooking and baking conversions. For best results in recipes, use weight measurements (grams or ounces) rather than volume measurements (cups or spoons) for dry ingredients like flour and sugar. Weight measurements are more accurate and consistent. Many modern recipes provide weight equivalents for precision baking.