Weight Converter
Conversion Formula
Grams to Pounds Formula
To convert between grams and pounds, use these formulas:
Pounds to Grams Formula
Enter a value in either field above to see the conversion result in the other field.
Common Conversions
| Grams | Pounds |
|---|---|
| 100 g | 0.220 lb |
| 250 g | 0.551 lb |
| 453.59 g | 1 lb |
| 500 g | 1.102 lb |
| 1000 g | 2.205 lb |
| 2000 g | 4.409 lb |
About Weight Units
The gram (g) is a metric unit of weight defined as one thousandth of a kilogram. It's widely used in scientific contexts and in most countries worldwide.
The pound (lb) is an imperial and US customary unit of weight, equal to 16 ounces or approximately 453.59 grams. It's commonly used for body weight, food measurements, and general weighing in the United States and some other countries.
Practical Applications
Converting between grams and pounds is essential for:
- International cooking and baking recipes
- Fitness and weight tracking
- Shipping and postage calculations
- Food packaging and nutrition information
- Industrial manufacturing and material specifications
About Pounds
Typical Use Cases
The pound is the primary weight measurement in the United States for everyday applications, from body weight tracking to grocery shopping. It's widely used in fitness apps, medical settings, food packaging, and international shipping. American recipes commonly specify ingredient weights in pounds and ounces, making this conversion essential for anyone following US-based cooking instructions or nutritional guidelines.
Historical Background
The pound has its origins in ancient Rome, where the "libra pondo" (meaning "a pound by weight") gave us both the abbreviation "lb" and the unit's name. The modern avoirdupois pound was standardized in 1959 as exactly 453.59237 grams through international agreement between English-speaking nations. Despite global metrication efforts, the pound remains deeply embedded in American culture and commerce.
Conversion Tips
When converting grams to pounds for body weight, remember that small gram values result in very small pound decimals (e.g., 100g = 0.220 lb). For cooking, it's often helpful to think in terms of common reference points: 454g ≈ 1 lb, 227g ≈ 0.5 lb. When tracking weight loss or gain, changes of 100-200 grams translate to about 0.2-0.4 pounds, which may not always show on typical bathroom scales.
Frequently Asked Questions
How many grams are in a pound?
One pound equals 453.59237 grams. This is the standard conversion used internationally for weight measurements.
How do I convert 100 grams to pounds for grocery shopping?
To convert 100 grams to pounds, multiply by 0.00220462. So 100g = 0.220 lb. This is especially useful when buying bulk produce or comparing package sizes at the grocery store where weights are listed in different units.
Pounds vs Grams: Which is more accurate for weighing produce?
Both units can be equally accurate—it depends on your scale's precision. Grams provide finer detail (453 increments per pound), making them better for small portions like spices or herbs. Pounds are more intuitive for larger items like meat or bulk vegetables. For international recipes or nutritional tracking, grams offer better consistency.
How do I track body weight loss in pounds and grams?
For fitness tracking, grams provide more sensitive measurements. A 200-gram daily fluctuation equals about 0.44 pounds—often too small to register on pound-only scales. Track in grams for weekly trends, then convert to pounds for monthly progress reports. Our converter helps you switch between units seamlessly for fitness apps and medical records.
How do I convert baby weight from pounds to grams for medical records?
Pediatricians often require newborn weight in grams for precise growth tracking. If your home scale shows pounds (e.g., 7.5 lb), convert by multiplying by 453.59: 7.5 lb = 3,402 grams. Medical charts track changes as small as 10-20 grams, which is crucial for monitoring newborn feeding and health.
What are USPS weight limits in pounds vs grams for international shipping?
USPS First-Class International has a 4-pound (1,814g) limit, while Priority Mail International allows up to 70 pounds (31,751g). Many countries' customs forms require weights in grams. Use our converter to ensure packages meet limits—a 4.1 lb item (1,860g) would exceed First-Class and cost significantly more.
Is this converter accurate for gym weights and fitness tracking?
Absolutely! Our converter is accurate to 3 decimal places, making it perfect for tracking weightlifting progress (converting barbell plates), body weight changes, and macronutrient portions. Bodybuilders often track protein intake in grams but weigh themselves in pounds—our tool bridges both systems.
About Our Conversion Standards
Our weight conversions are based on the International System of Units (SI) and standards published by the National Institute of Standards and Technology (NIST). All conversion factors are accurate to at least 6 decimal places, ensuring precision for both everyday and professional use.
Data Sources: NIST Handbook 44, International Bureau of Weights and Measures (BIPM), ISO 80000-3:2006
Last Verified: October 2025