Ounce to Gram Conversion Chart
| Ounce (oz) | Gram (grams) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.25 oz | 7.09 grams | Quarter-Ounce Precious Metal Sample / Spice Sachet | 0.25 × 28.3495 = 7.09 g |
| 0.5 oz | 14.17 grams | Half-Ounce Standard Household Key Ring with Two Keys | 0.5 × 28.3495 = 14.17 g |
| 0.75 oz | 21.26 grams | Three-Quarter Ounce Standard Plastic Measuring Scoop | 0.75 × 28.3495 = 21.26 g |
| 1 oz | 28.35 grams | USPS First-Class Letter Base Rate / Slice of Deli Cheese | 1 × 28.3495 = 28.35 g |
| 2 oz | 56.7 grams | Two-Ounce Commercial Energy Drink Shot Bottle | 2 × 28.3495 = 56.70 g |
| 3 oz | 85.05 grams | Three-Ounce Single Chicken Breast Fillet Serving | 3 × 28.3495 = 85.05 g |
| 4 oz | 113.4 grams | Quarter-Pound Burger Patty / One Stick of US Butter | 4 × 28.3495 = 113.40 g |
| 6 oz | 170.1 grams | Six-Ounce Cup of Greek Yogurt | 6 × 28.3495 = 170.10 g |
| 8 oz | 226.8 grams | Half-Pound Block of Cream Cheese | 8 × 28.3495 = 226.80 g |
| 10 oz | 283.5 grams | Standard Package of Gourmet Frozen Vegetables | 10 × 28.3495 = 283.50 g |
| 12 oz | 340.19 grams | Standard Retail Bag of Whole Bean Coffee | 12 × 28.3495 = 340.19 g |
| 16 oz | 453.59 grams | Exactly One Avoirdupois Pound (16 oz Reference) | 16 × 28.3495 = 453.59 g |
| 20 oz | 566.99 grams | Twenty-Ounce Family Size Breakfast Cereal Box | 20 × 28.3495 = 566.99 g |
| 32 oz | 907.18 grams | Exactly Two Avoirdupois Pounds (Quart Jar of Honey) | 32 × 28.3495 = 907.18 g |
| 64 oz | 1814.37 grams | Four-Pound Commercial Bag of Granulated Flour | 64 × 28.3495 = 1,814.37 g |
| 100 oz | 2834.95 grams | One Hundred Ounce Bulk Postal Shipping Parcel (6.25 lbs) | 100 × 28.3495 = 2,834.95 g |
Ounce to Gram Formula & Unit Definitions
Because 1 avoirdupois pound is defined under the 1959 treaty as exactly 0.45359237 kilograms (453.59237 grams) and contains 16 ounces, 1 ounce equals 453.59237 ÷ 16 = exactly 28.349523125 grams. To convert ounces to grams, multiply the ounce amount by 28.3495 (or divide by 0.035274). To reverse the calculation, multiply grams by 0.035274.
Quick Estimation: For a quick kitchen calculation in your head, multiply the ounce value by 30 and subtract 5%. For example, 4 ounces × 30 = 120; subtracting 6 gives 114 grams (actual exact is 113.4 g).
Ounce Standard (oz / avoirdupois)
US Customary & Imperial Unit- Creator & Origin: Derived from the ancient Roman uncia (one-twelfth part) and formalized in medieval England as 1/16 of an avoirdupois pound.
- Standard Definition: Defined under international treaty law since 1959 as exactly 28.349523125 metric grams.
- Everyday Focus: US retail packaged foods, supermarket deli portions, domestic postal envelope tiers, and precious kitchen recipe ingredients.
Gram Standard (g)
SI Metric Subunit- Creator & Origin: Established in 1795 by the French Republic as the absolute mass of one cubic centimeter of pure water at the melting point of ice.
- Standard Definition: Defined in the SI system as exactly 1/1,000 of a kilogram (10⁻³ kg), anchored to the fundamental Planck constant h.
- Everyday Focus: Culinary pastry baking, dietary nutrition labels, pharmaceutical compounding, and scientific laboratory chemistry.
Frequently Asked Questions
Q.What is the exact formula to convert ounces to grams?
To convert ounces to grams, multiply the ounce value by 28.349523125 (or divide by 0.035274). The mathematical equation is: g = oz × 28.3495. For the opposite calculation, use our Gram to Ounce converter.
Q.How many grams are in 1 ounce?
There are exactly 28.349523125 grams in 1 avoirdupois ounce under the 1959 international treaty. In everyday kitchen and commercial use, this is rounded to 28.35 grams.
Q.What is the easiest mental shortcut to convert ounces to grams?
Multiply the number of ounces by 30, then subtract 5% of that result. For instance, 5 oz × 30 = 150; 150 − 7.5 = 142.5 grams (exact value: 141.75 g).
Q.Are dry ounces and fluid ounces converted the same way?
No. The ounce converted here is the avoirdupois ounce of mass (weight). Fluid ounces measure liquid volume. They are only numerically equal for water at room temperature.
Q.What is the difference between an avoirdupois ounce and a troy ounce?
An avoirdupois ounce (used for groceries, postal mail, and general goods) equals 28.3495 grams. A troy ounce (used exclusively for gold, silver, and precious metals) is heavier, equaling approximately 31.1035 grams.