Grams to Avoirdupois Ounces with Formula

For mass m in grams, the calculator multiplies m by 0.035274 to obtain avoirdupois ounces (oz). It also uses 0.002205 pounds per gram and 1,000 milligrams per gram.

For 100 g, 100 × 0.035274 = 3.5274 oz, displayed to four decimal places. NIST gives 1 avoirdupois oz ≈ 28.34952 g; the calculator factor is rounded.

The form rejects negative and nonnumeric inputs, accepts zero, and displays two to four decimal places. It measures mass, not fluid ounces. It does not account for a food ingredient’s volume or density.

Is an ounce of flour the same volume as an ounce of water?

No. The result is a mass ounce; equal masses can occupy different volumes.

• NIST SI conversion factors for avoirdupois ounces and pounds

Last reviewed: 2026-09-28.

mL to cups, Roman numerals, 24-hour time