Ounces to Pounds: Exact Conversion and Common Weights
Convert ounces to pounds with the exact 16-oz-per-pound relationship, a quick reference table, and the everyday weights Americans actually measure.
The Exact Ounces to Pounds Relationship
In the US customary system, the pound and the ounce are linked by a fixed, exact constant: 1 pound = 16 ounces. That means 1 ounce = 1/16 pound = 0.0625 pound exactly. To convert any ounce value to pounds, divide by 16 (or multiply by 0.0625).
This is the avoirdupois ounce, the everyday unit used for food, shipping, and body weight in the United States. Our kg to lbs converter handles the metric side, and our ounces to grams converter covers grams directly.
Quick Reference: Ounces to Pounds
Common values
4 oz = 0.25 lb
8 oz = 0.5 lb (half a pound)
12 oz = 0.75 lb
16 oz = 1 lb exactly
32 oz = 2 lb
Worked Example
Convert 8 ounces to pounds:
8 oz ÷ 16 = 0.5 lb. So 8 ounces is exactly half a pound.
For a larger value, 24 oz ÷ 16 = 1.5 lb.
Where Ounces and Pounds Show Up
Groceries, ground coffee, deli meat, and shipping parcels are often labeled in ounces, while larger weights and body weight use pounds. A 12-ounce package of pasta is 0.75 lb; a 2-pound bag of rice is 32 ounces. Knowing the 16-to-1 ratio lets you compare them instantly.
For the metric view, 1 oz = 28.3495 g, so 1 lb = 453.592 g. See our pounds vs kilograms guide for the kilogram side of the same weights.
Frequently Asked Questions
How many ounces are in a pound?
Exactly 16 ounces make 1 pound in the US customary (avoirdupois) system.
How do I convert ounces to pounds?
Divide the ounces by 16. For example, 8 oz ÷ 16 = 0.5 lb, and 24 oz ÷ 16 = 1.5 lb.
Is 8 ounces half a pound?
Yes. 8 oz = 0.5 lb exactly, because a pound is 16 ounces.
How many grams is one ounce?
One avoirdupois ounce equals 28.3495 grams, so one pound equals 453.592 grams.
Try the Calculator
kg to lbs Converter
Get instant, accurate results with our free converter.
oz to Grams Converter
Convert the other direction just as easily.
Quick Summary
Ounces and pounds are linked exactly: 1 pound = 16 ounces, so 1 ounce = 0.0625 pound. Divide ounces by 16 to get pounds (8 oz = 0.5 lb, 16 oz = 1 lb). The same weights convert to metric at 1 oz = 28.3495 g.
Related Guide
Pounds vs Kilograms: Which Should You Use?
Pounds and kilograms both measure mass but belong to different systems. Learn the exact relationship and when each unit is the right choice.
Read Full Guide →More in Weight Loss & Fitness
70 kg to lbs: Convert 70 Kilograms to Pounds for Fitness and Health
Convert 70 kg to lbs with the exact formula. 70 kilograms equals 154.32 pounds, a key weight for fitness tracking, medical records, and travel.
80 kg to lbs: Convert 80 Kilograms to Pounds for Training and Travel
Convert 80 kg to lbs with the exact formula. 80 kilograms equals 176.37 pounds, a common weight for strength training, body weight, and shipping.
100 kg to lbs: Convert 100 Kilograms to Pounds for Lifting and Logistics
Convert 100 kg to lbs with the exact formula. 100 kilograms equals 220.46 pounds, a key weight for heavy lifting, freight, and body weight records.
60 kg to lbs: Convert 60 Kilograms to Pounds for Fitness and Travel
Convert 60 kg to lbs with the exact formula. 60 kilograms equals 132.28 pounds, a common weight for fitness tracking, body weight, and luggage.
50 kg to lbs: Convert 50 Kilograms to Pounds for Health and Shipping
Convert 50 kg to lbs with the exact formula. 50 kilograms equals 110.23 pounds, a common weight for body weight, fitness, and shipping limits.
Convert Another Unit
Disclaimer
Unit conversions on this site use internationally recognized, fixed conversion factors (for example, 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 °F = (°C × 9/5) + 32). They are provided for general, informational, and educational use. For applications where accuracy is critical — such as medical dosing, engineering, scientific research, trade, or legal compliance — always verify results against authoritative sources such as the U.S. National Institute of Standards and Technology (NIST) and the official International System of Units (SI) brochure, and follow any applicable local standards.
Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 pound (lb, avoirdupois) = 0.45359237 kilograms (exact)
- EXACT1 ounce (oz, avoirdupois) = 28.349523125 grams (exact, 1/16 lb)
- EXACT1 stone (st) = 6.35029318 kilograms (exact, 14 lb)
- EXACT1 short ton (US) = 907.18474 kilograms (exact, 2000 lb)
Common Pitfalls & How to Avoid Them
Mass vs. weight
The pound and kilogram are units of MASS, not force. On Earth, mass and "weight" read the same number in practice, but a 70 kg mass weighs less on the Moon. UnitFig converts mass; for scientific force you need newtons (1 lbf = 4.4482216152605 N, exact).
Avoirdupois vs. troy ounce
Cooking and body weight use the avoirdupois ounce (28.349523125 g). Gold and precious metals use the troy ounce (31.1034768 g). Never mix them — the error is about 10%.
Rounding the factor
Using 2.2 instead of the exact 2.20462262 overstates small errors at large values. For medical dosing or competition weight classes, keep the full factor or use a converter.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
Last Updated 2026 | This article was reviewed for accuracy