Weight and Mass Converter
Convert weight and mass units instantly — kilograms, pounds, grams, ounces, tons, and more. Accurate and easy-to-use online weight converter for cooking, shipping, and science.
Understanding Weight vs Mass
Mass measures the amount of matter in an object. Weight measures the gravitational force acting on that mass. Your mass stays constant everywhere, but your weight changes on different planets due to varying gravity.
On Earth, we use weight and mass interchangeably because gravity remains nearly constant. The kilogram serves as the SI base unit for mass. Pounds and ounces form the imperial system for everyday weight measurements.
Weight Conversion Formulas
Kilograms to Pounds
lb = kg × 2.20462
Example: 70 kg × 2.20462 = 154.32 lb
Pounds to Kilograms
kg = lb × 0.453592
Example: 150 lb × 0.453592 = 68.04 kg
Grams to Ounces
oz = g × 0.035274
Example: 100 g × 0.035274 = 3.527 oz
Ounces to Grams
g = oz × 28.3495
Example: 8 oz × 28.3495 = 226.8 g
Common Weight Conversions
| Metric | Imperial Equivalent |
|---|---|
| 1 gram | 0.035 ounces |
| 1 kilogram | 2.205 pounds |
| 100 grams | 3.527 ounces |
| 500 grams | 1.102 pounds |
| 1 metric ton | 2,204.62 pounds |
| 10 kilograms | 22.046 pounds |
Cooking Ingredient Weights
| Ingredient | 1 Cup = | 1 Tablespoon = |
|---|---|---|
| Flour (all-purpose) | 125 g | 8 g per tbsp |
| Sugar (granulated) | 200 g | 12.5 g per tbsp |
| Butter | 227 g | 14 g per tbsp |
| Rice (uncooked) | 185 g | 11.5 g per tbsp |
| Milk | 245 g | 15.3 g per tbsp |
| Honey | 340 g | 21 g per tbsp |
Weight Unit Reference Table
| Unit | Symbol | Equals 1 Unit In kg | System |
|---|---|---|---|
| Milligram | mg | 0.000001 kg | Metric |
| Gram | g | 0.001 kg | Metric |
| Kilogram | kg | 1 kg | Metric (SI) |
| Metric Ton | t | 1,000 kg | Metric |
| Ounce | oz | 0.02835 kg | Imperial |
| Pound | lb | 0.45359 kg | Imperial |
| Stone | st | 6.35029 kg | Imperial (UK) |
| US Ton | ton | 907.185 kg | Imperial (US) |
| Long Ton (UK) | long ton | 1,016.047 kg | Imperial (UK) |
Real-World Weight Examples
| Object | Weight/Mass |
|---|---|
| Paperclip | 1 gram (0.035 oz) |
| Smartphone | 150-200 grams (5.3-7 oz) |
| Laptop computer | 1.5-2.5 kg (3.3-5.5 lb) |
| Average adult male | 70-90 kg (154-198 lb) |
| Average adult female | 55-75 kg (121-165 lb) |
| Compact car | 1,200-1,500 kg (2,645-3,307 lb) |
When to Use Each Weight Unit
Milligrams (mg)
Medicine doses, vitamins, supplements, precious metals
Grams (g)
Food portions, cooking ingredients, postal weights, jewelry
Kilograms (kg)
Body weight, produce, luggage, packages, gym weights
Metric Tons (t)
Vehicles, cargo, construction materials, industrial goods
Ounces (oz)
Food portions, letters, small packages, liquids (fl oz)
Pounds (lb)
Body weight (US), produce, meat, luggage, packages
Stone (st)
Body weight (UK only), one stone equals 14 pounds
Tons
Vehicles, heavy cargo, construction (US ton = 2,000 lb)
Weight in Different Contexts
Body Weight
Most countries use kilograms for body weight. The US and Liberia use pounds. The UK uses stone and pounds (1 stone = 14 lb). A healthy BMI ranges from 18.5 to 24.9 kg/m².
Shipping and Postal
Shipping costs depend on weight. Domestic packages often use pounds or kilograms. International shipping requires metric measurements. Always round up to the nearest unit for accurate pricing.
Cooking and Baking
Professional bakers use grams for precision. Volume measurements (cups) vary with packing density. Weight measurements ensure consistent results. Digital kitchen scales improve accuracy.
Frequently Asked Questions
How many pounds are in a kilogram?
One kilogram equals exactly 2.20462 pounds. For quick estimates, multiply kilograms by 2.2. Example: 5 kg × 2.2 = 11 lb (actual: 11.02 lb).
What is the difference between a US ton and a metric ton?
A US (short) ton equals 2,000 pounds (907.18 kg). A metric ton (tonne) equals 1,000 kilograms (2,204.62 lb). A UK (long) ton equals 2,240 pounds (1,016.05 kg).
How do I convert my weight from pounds to kilograms?
Divide pounds by 2.20462. For quick mental math, divide by 2, then subtract 10%. Example: 180 lb ÷ 2 = 90, minus 9 = 81 kg (actual: 81.65 kg).
Why do recipes use grams instead of cups?
Weight measurements provide consistent results. One cup of flour can vary from 120-150 grams depending on how you scoop it. Grams eliminate this variation, ensuring your baked goods turn out the same every time.
Other Free Tools
Length Converter
Convert length units instantly — meters, feet, inches, kilometers, miles, yards, and more. Free online length converter for everyday and scientific use.
Density Converter
Convert density units — kg/m³, g/cm³, lb/ft³, lb/in³, and more. Free online density converter for material science, chemistry, and engineering.
Specific Volume Converter
Convert specific volume units — m³/kg, L/kg, ft³/lb, and more. Accurate online converter for thermodynamics and fluid mechanics.
Mass Flux Density Converter
Convert mass flux density units — kg/(m²·s), lb/(ft²·s), and more. Free online mass flux converter for chemical engineering and filtration.
Mass Flow Rate Converter
Convert mass flow rate units — kg/s, lb/min, g/h, and more. Accurate online mass flow converter for chemical processing and aerospace.
BMI Calculator — Body Mass Index
Calculate your Body Mass Index (BMI) from height and weight. Find out if you're underweight, normal weight, overweight, or obese. Free online BMI calculator for adults and children.
Height Converter — cm to ft & in
Convert height between centimeters, feet and inches, and meters. Free online height converter — instantly see your height in any unit, perfect for profiles, travel, and fitness.
Cups to Grams Converter
Convert cups to grams for flour, sugar, butter, rice, oats, and 50+ ingredients. Get accurate weight measurements for any recipe with our free online cups to grams converter.
Ingredient Density Converter
Convert between volume and weight for common cooking ingredients using accurate density values. Free online ingredient converter for baking, cooking, and precise recipe scaling.
Rebar Weight Calculator
Calculate the total weight of steel rebar for your construction project. Enter bar diameter, length, and quantity to get accurate rebar weight in kg or lbs. Free online rebar weight calculator.
Cement, Sand & Aggregate Calculator
Calculate exact quantities of cement, sand, and aggregate needed for your concrete mix. Enter volume and mix ratio to get material amounts in kg, bags, and cubic meters. Free construction material calculator.
Planet Weight Calculator
Find out how much you would weigh on Mars, Jupiter, the Moon, and other planets. Free online planet weight calculator based on surface gravity for astronomy and science education.
Calorie Burn Rate Calculator
Estimate calories burned per hour for running, cycling, swimming, walking, and more. Free online calorie burn rate converter based on activity type and body weight.
Fuel Efficiency by Mass Converter
Convert fuel efficiency by mass — km/kg, miles/lb, and more. Free online converter for rocket propulsion and alternative fuel vehicles.
Fabric GSM Converter
Convert fabric weight between GSM, oz/yd², and other textile units. Free online fabric GSM converter for fashion designers, garment manufacturers, and textile buyers.
Heat Density Converter
Convert heat density units — J/m³, BTU/ft³, cal/cm³, and more. Free online converter for combustion engineering and fuel analysis.
Specific Heat Capacity Converter
Convert specific heat capacity units — J/(kg·K), BTU/(lb·°F), cal/(g·°C), and more. Accurate online converter for thermodynamics and chemistry.
Volume Converter
Convert volume units — liters, gallons, milliliters, cubic feet, fluid ounces, and more. Free online volume converter for cooking and engineering.
Area Converter
Convert area units — square meters, acres, hectares, square feet, square kilometers, and more. Ideal for real estate and construction.
Acceleration Converter
Convert acceleration units — m/s², g-force, ft/s², Gal, and more. Accurate online converter for physics, aerospace, and mechanical engineering.
Surface Tension Converter
Convert surface tension units — N/m, mN/m, dyne/cm, lbf/ft, and more. Free online converter for chemistry and materials science.
Dynamic Viscosity Converter
Convert dynamic viscosity units — Pa·s, centipoise, poise, lb/(ft·s), and more. Free online converter for fluid mechanics and chemical engineering.
Kinematic Viscosity Converter
Convert kinematic viscosity units — m²/s, centistokes, stokes, ft²/s, and more. Accurate online converter for fluid dynamics and oil analysis.
Thermal Expansion Converter
Convert thermal expansion coefficients — per Kelvin, per Celsius, per Fahrenheit, and more. Free online converter for materials science and engineering.
Force Converter
Convert force units — newtons, pound-force, kilogram-force, dynes, and more. Free online force converter for physics and engineering.
Torque Converter
Convert torque units — newton-meters, pound-feet, kilogram-force centimeters, and more. Accurate online converter for automotive and mechanical engineering.
Molar Flow Rate Converter
Convert molar flow rate units — mol/s, kmol/h, lbmol/min, and more. Free online molar flow converter for chemical engineering and process design.
Solution Concentration Converter
Convert solution concentration units — ppm, ppb, mg/L, percent, g/L, and more. Accurate online converter for chemistry and water treatment.
Radiation Dose Converter
Convert radiation dose units — gray, rad, sievert, rem, and more. Free online radiation dose converter for medical physics, radiology, nuclear safety, and health physics.
Horsepower to Animals Converter
How many horses is your car's engine worth? Convert horsepower to fun animal equivalents — horses, hamsters, elephants, and more. A lighthearted power converter for curious minds.