Pounds to Ounces

Avoirdupois Mass Standards & NIST SP 811

The avoirdupois pound is legally defined as exactly 16 ounces (0.45359237 kg):

• 1 Pound (lb): 16.0 Ounces (oz) = 453.59237 g = 0.453592 kg

• 1 Ounce (oz): (1) / (16) lb = 0.0625 lbs = 28.3495 g

Primary Mass Equivalents Table

• 0.25 lb: 4.0 oz = 113.4 g

• 0.50 lb: 8.0 oz = 226.8 g

• 1.00 lb (1 lb): 16.0 oz = 453.6 g

• 2.00 lbs (2 lbs): 32.0 oz = 907.2 g

• 2.50 lbs: 40.0 oz = 1,134.0 g

• 5.00 lbs (5 lbs): 80.0 oz = 2,268.0 g

• 7.50 lbs (7 lbs 8 oz): 120.0 oz = 3,401.9 g

• 10.00 lbs (10 lbs): 160.0 oz = 4,535.9 g

Equations

• Ounces (oz) = Pounds (lbs) × 16

• Pounds (lbs) = Ounces (oz)16

How to Use This Calculator

Enter your Weight Value to Convert (e.g. 2.5), Commercial & Grocery Benchmark — choose from Custom Weight Value, 0.25 lb (4.0 oz / 1/4 lb Burger Patty), 0.50 lb (8.0 oz / Restaurant Steak), and Conversion Direction — choose from Pounds to Ounces (lbs → oz / multiply by 16), Ounces to Pounds (oz → lbs / divide by 16). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors used in this calculator:

1 lb = 16 oz exact

Worked Example

A 2.5 lb chuck pot roast weighs exactly 40 ounces (2 pounds 8 ounces) on a commercial meat 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.