Ounces and Pounds — Complete Guide to lb oz Conversion
How many ounces in a pound? Complete guide to ounces and pounds conversion with oz to lb calculator, conversion table, and worked examples for cooking and fitness.
Whether you’re following an American recipe, tracking your body weight, or converting shipping measurements, understanding the relationship between ounces and pounds is essential. Here’s the complete guide.
How Many Ounces in a Pound?
1 pound (lb) = exactly 16 ounces (oz)
This is an exact, defined relationship in the imperial and US customary systems. Therefore:
- 1 oz = 1/16 lb = 0.0625 lb
- 8 oz = 0.5 lb (half a pound)
- 16 oz = 1 lb
- 32 oz = 2 lbs
Ounces to Pounds Conversion Table
| Ounces (oz) | Pounds (lbs) | Pounds & Ounces |
|---|---|---|
| 1 oz | 0.0625 lb | 0 lb 1 oz |
| 2 oz | 0.125 lb | 0 lb 2 oz |
| 4 oz | 0.25 lb | 0 lb 4 oz |
| 6 oz | 0.375 lb | 0 lb 6 oz |
| 8 oz | 0.5 lb | 0 lb 8 oz |
| 10 oz | 0.625 lb | 0 lb 10 oz |
| 12 oz | 0.75 lb | 0 lb 12 oz |
| 14 oz | 0.875 lb | 0 lb 14 oz |
| 16 oz | 1.0 lb | 1 lb 0 oz |
| 20 oz | 1.25 lb | 1 lb 4 oz |
| 24 oz | 1.5 lb | 1 lb 8 oz |
| 32 oz | 2.0 lb | 2 lb 0 oz |
| 48 oz | 3.0 lb | 3 lb 0 oz |
| 64 oz | 4.0 lb | 4 lb 0 oz |
Pounds and Ounces to Kilograms
To convert a mixed lb oz measurement to kilograms:
Formula:
kg = (lbs + oz/16) × 0.45359237
Examples
5 lbs 4 oz to kg:
- Total lbs = 5 + (4/16) = 5.25 lbs
- 5.25 × 0.45359237 = 2.381 kg
6 lbs 40 oz to kg (note: 40 oz = 2.5 lbs):
- Total lbs = 6 + (40/16) = 6 + 2.5 = 8.5 lbs
- 8.5 × 0.45359237 = 3.856 kg
0.5 lb in oz:
- 0.5 × 16 = 8 oz
Kg to Lbs and Oz Conversion
To convert kilograms to a mixed pounds-and-ounces format:
Formula:
total_lbs = kg × 2.2046226218
whole_lbs = Math.floor(total_lbs)
oz_part = (total_lbs - whole_lbs) × 16
Examples
3.5 kg to lbs and oz:
- 3.5 × 2.2046 = 7.716 lbs
- 7 whole pounds, 0.716 × 16 = 11.46 oz
- = 7 lbs 11.5 oz
4.5 kg to lbs and oz:
- 4.5 × 2.2046 = 9.921 lbs
- 9 whole pounds, 0.921 × 16 = 14.74 oz
- = 9 lbs 14.7 oz
Ounces vs Fluid Ounces
Be careful: the “ounce” in weight (oz) is different from a “fluid ounce” (fl oz) used for volume. This guide covers weight ounces only.
| Type | What it measures | 1 unit = |
|---|---|---|
| Ounce (oz) | Weight/Mass | 28.3495 grams |
| Fluid ounce (fl oz) | Volume | 29.5735 ml (US) |
Ounces to Grams
1 ounce (oz) = 28.3495231 grams (g)
| Ounces | Grams |
|---|---|
| 1 oz | 28.35 g |
| 2 oz | 56.70 g |
| 4 oz | 113.40 g |
| 8 oz | 226.80 g |
| 12 oz | 340.19 g |
| 16 oz (1 lb) | 453.59 g |
Frequently Asked Questions
How many ounces are in a pound?
Exactly 16 ounces are in one pound. This is a fixed, exact value in the imperial and US customary systems.
How many grams are in an ounce?
1 ounce = 28.3495231 grams (often rounded to 28.35 g).
How do I convert 3.5 kg to lbs and oz?
3.5 kg = 7.716 lbs = 7 lbs 11.5 oz.
How do I convert 4.5 kg to pounds and ounces?
4.5 kg = 9.921 lbs = 9 lbs 14.7 oz.
What is 0.5 lb in ounces?
0.5 lb = 0.5 × 16 = 8 ounces.
How do I convert 5 lbs 4 oz to kg?
5 lbs 4 oz = 5.25 lbs × 0.45359237 = 2.381 kg.