Pounds to Grams

International Mass Standards & NIST SP 811

Under the International Yard and Pound Agreement of 1959, 1 international avoirdupois pound is legally defined as exactly 453.59237 grams (0.45359237 kg):

• 1 Pound (lb): 453.59237 g = 0.453592 kg = 16.0 oz = 453,592.37 mg

• 1 Gram (g): 0.002204623 lbs = 0.035274 oz = 0.001 kg

Primary Grocery & Baking Mass Benchmarks

• 0.25 lb: 113.40 g

• 0.50 lb (8 oz Coffee Bag): 226.80 g

• 1.00 lb (16 oz Loaf Bread): 453.59 g

• 2.00 lbs (32 oz Sugar Box): 907.18 g = 0.907 kg

• 5.00 lbs (Flour Bag): 2,267.96 g = 2.268 kg

• 10.00 lbs (Potato Sack): 4,535.92 g = 4.536 kg

Equations

• Grams (g) = Pounds (lbs) × 453.59237

• Pounds (lbs) = Grams (g)453.59237

How to Use This Calculator

Enter your Weight Value to Convert (e.g. 5.0), Grocery & Baking Benchmark — choose from Custom Weight Value, 0.25 lb (113.4 g / 1 Stick of Butter / 4 oz), 0.50 lb (226.8 g / 8 oz Coffee Bag), and Conversion Direction — choose from Pounds to Grams (lbs → g / multiply by 453.59), Grams to Pounds (g → lbs / divide by 453.59). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors used in this calculator:

1 lb = 453.59237 g exact

Worked Example

A 1.0 lb loaf of sourdough bread weighs exactly 453.6 grams (16 ounces) on a digital kitchen food scale.

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.