Weight Converter
Convert between different weight and mass units instantly
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About Weight Conversion
Our weight converter supports all common units including pounds, kilograms, ounces, grams, stones, and tons. Perfect for cooking, shipping, fitness tracking, and scientific calculations.
Common Weight Conversions
- 1 pound = 16 ounces = 453.592 grams
- 1 kilogram = 1,000 grams = 2.205 pounds
- 1 ounce = 28.35 grams
- 1 stone = 14 pounds = 6.35 kilograms
- 1 ton = 2,000 pounds = 907.185 kilograms
Weight Converter – Instantly Convert Kilograms, Pounds, Ounces, and More
Whether you're cooking a recipe from another country, tracking your weight for fitness, or shipping a package internationally, unit conversions can get confusing fast. Our makes it effortless to switch between kilograms, pounds, grams, ounces, stones, and tons — with accurate results in seconds.
Supported Weight Units
Metric System
- • Milligrams (mg)
- • Grams (g)
- • Kilograms (kg)
- • Metric Tons (t)
Imperial System
- • Ounces (oz)
- • Pounds (lbs)
- • Stones (st)
- • US Tons
Common Weight Conversion Equivalents
• 1 pound = 16 ounces = 453.592 grams
• 1 kilogram = 1,000 grams = 2.205 pounds
• 1 ounce = 28.35 grams
• 1 stone = 14 pounds = 6.35 kilograms
Real-Life Use Cases
🍳 Cooking & Baking
Converting recipe ingredients from grams to ounces or pounds to kilograms for international recipes.
💪 Fitness Tracking
Converting body weight between pounds and kilograms for gym equipment or health records.
📦 Shipping & Logistics
Converting package weights for international shipping rates and customs declarations.
✈️ Travel
Converting luggage weight limits between pounds and kilograms for different airlines.
🔬 Science & Lab Work
Converting measurements for scientific experiments and chemical calculations.
🏪 Retail & Commerce
Converting product weights for international sales and inventory management.
Weight Conversion Formulas
Pounds to Kilograms: kg = lbs ÷ 2.205
Kilograms to Pounds: lbs = kg × 2.205
Ounces to Grams: g = oz × 28.35
Grams to Ounces: oz = g ÷ 28.35
Imperial vs Metric Weight Systems
Metric System
Used by most countries worldwide. Based on powers of 10, making calculations easier.
Countries: Europe, Asia, Africa, South America, Australia
Imperial System
Primarily used in the United States and UK. Based on historical measurements.
Countries: United States, Myanmar, Liberia (partial)
Fitness Weight Examples
Common Body Weights
- • 120 lbs = 54.4 kg
- • 150 lbs = 68.0 kg
- • 180 lbs = 81.6 kg
- • 200 lbs = 90.7 kg
Gym Equipment Weights
- • 45 lbs = 20.4 kg (Olympic barbell)
- • 25 lbs = 11.3 kg (standard plate)
- • 10 lbs = 4.5 kg (light dumbbell)
- • 50 lbs = 22.7 kg (heavy dumbbell)
Why Our Weight Converter Stands Out
Frequently Asked Questions
How many grams are in a pound?
There are exactly 453.592 grams in one pound. This is the standard conversion used worldwide.
What countries use stones for weight?
Stones are primarily used in the United Kingdom and Ireland for measuring body weight. One stone equals 14 pounds or 6.35 kilograms.
Is there a difference between mass and weight?
Technically yes — mass is the amount of matter, while weight is the force of gravity on that mass. However, for everyday conversions, the terms are used interchangeably.
How accurate are online weight converters?
Our uses precise mathematical formulas and provides accuracy to multiple decimal places, suitable for most practical applications.
Ready to Convert Weights?
Use our free weight converter to get instant, accurate results for any weight conversion.
Converting between different weight units doesn't have to be complicated. With our , you can quickly switch between kilograms, pounds, ounces, grams, stones, and tons with confidence. Whether you're following an international recipe, tracking fitness progress, or handling shipping logistics, accurate weight conversion is just a click away.
Guide Complet de Conversion de Poids et Masse
Guide exhaustif sur les mesures, conversions et applications professionnelles du poids et de la masse
Comprendre les Systèmes de Poids et Masse
Unités Métriques (SI)
- •Kilogramme (kg) — unité de base SI pour la masse
- •Gramme (g) = 0,001 kg
- •Milligramme (mg) = 0,000001 kg
- •Tonne métrique (t) = 1 000 kg
- •Microgramme (μg) = 0,000000001 kg
Système Impérial et Avoirdupois
- •Once (oz) = 28,3495 g
- •Livre (lb) = 16 oz = 453,592 g
- •Stone = 14 lb = 6,35 kg
- •Tonne courte (États-Unis) = 2 000 lb = 907,185 kg
- •Tonne longue (Royaume-Uni) = 2 240 lb = 1 016,05 kg
Facteurs de Conversion Essentiels
Conversions Métriques
- •1 kg = 1 000 g
- •1 g = 1 000 mg
- •1 tonne métrique = 1 000 kg
- •1 mg = 1 000 μg
- •1 kg = 2,20462 lb
Conversions Impériales
- •1 lb = 16 oz
- •1 stone = 14 lb
- •1 tonne américaine = 2 000 lb
- •1 tonne britannique = 2 240 lb
- •1 oz = 28,3495 g
Systèmes Spécialisés
- •Once troy = 31,1035 g (métaux précieux)
- •Livre troy = 12 onces troy
- •Carat = 0,2 g (gemmes)
- •Grain = 64,799 mg (balles/médecine)
- •Tael = 37,5 g (commerce d'Asie orientale)
Applications Professionnelles
Alimentation et Cuisine
- •Mise à l'échelle de recettes
- •Étiquetage nutritionnel (g par portion)
- •Précision en pâtisserie (farine, sucre)
- •Contrôle des portions
- •Conversion de recettes internationales (oz vs g)
Médecine et Pharmacie
- •Dosage des médicaments en mg/kg de poids corporel
- •Préparation de fluides intraveineux
- •Pharmacie de préparation
- •Suivi du poids du patient
- •Calculs de dosage pédiatrique
Expédition et Logistique
- •Facturation du fret par poids dimensionnel vs réel
- •Limites de poids postal
- •Manifestes de cargaison
- •Déclarations douanières
- •Inventaire d'entrepôt en kg/lb
Science et Industrie
- •Balances de laboratoire (précision en μg)
- •Essais de matériaux (résistance à la traction)
- •Métallurgie (composition des alliages en % en poids)
- •Exploitation minière (dosage du minerai)
- •Agriculture (rendement par hectare)
Bonnes Pratiques de Mesure du Poids
Précision de la Mesure
- •Mettre la balance à zéro/tarer avant de peser
- •Utiliser la balance adaptée à la plage de mesure
- •Étalonner avec des masses certifiées
- •Déduire le poids du récipient
- •La température affecte les balances de précision
Distinction Masse / Poids
- •La masse (kg) est invariante
- •Le poids est masse × gravité (varie sur la Lune/dans l'espace)
- •Les balances mesurent le poids et affichent la masse en supposant 9,81 m/s²
- •Le poids corporel en kg est techniquement une masse
- •Les ingénieurs font soigneusement cette distinction
Exemples de Poids par Catégorie
Objets du Quotidien
- •Sucre (1 tasse) ≈ 200 g = 7,05 oz
- •Beurre (1 plaquette) = 113 g = 4 oz
- •Smartphone ≈ 175 g = 6,2 oz
- •Ordinateur portable ≈ 1,8 kg = 3,97 lb
- •Pneu de voiture ≈ 10 kg = 22 lb
- •Adulte ≈ 70 kg = 154 lb
- •Sac de farine (5 lb) = 2,27 kg
Alimentation et Cuisine
- •Steak 8 oz = 227 g
- •Portion de pâtes 100 g = 3,53 oz
- •Blanc de poulet 150 g = 5,29 oz
- •Pomme ≈ 182 g = 6,4 oz
- •Mesure de lait en poudre infantile 8,5 g
- •Pâte à pizza 250 g = 8,82 oz
- •Beurre 250 g = 8,82 oz
Industrie et Transport
- •Voiture ≈ 1 500 kg = 3 307 lb
- •Conteneur de fret (max.) 28 000 kg
- •Charge d'un semi-remorque 36 287 kg (80 000 lb)
- •Poids olympique (lancer) 7,26 kg = 16 lb
- •Lingot d'or 12,4 kg = 400 oz troy
- •Tonne de charbon = 1 000 kg
- •Éléphant ≈ 5 000 kg