Convert fluid ounces to dry ounces (weight) and back using the density of water, flour, sugar, oil, honey or milk, or your own measured density.

Fluid oz measure volume and dry oz measure weight, so density links them. Presets are typical values.

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Liquid Oz to Dry Oz Formula

The following formula converts US fluid ounces to ounces (weight) using density in g/mL; swap the 29.5735 constant with 28.4131 for Imperial fl oz.

oz = fl ozUS ร— 29.5735295625 (mL) / (fl oz) ร— ฯ (g) / (mL) ร— (1 oz) / (28.349523125 g)
  • US fluid ounce = 29.5735295625 mL
  • Imperial (UK) fluid ounce = 28.4130625 mL
  • Ounce (avoirdupois) = 28.349523125 g
  • Pound = 16 oz = 453.59237 g
  • Density ฯ in g/mL (examples): water 1.00; olive oil ~0.92; honey ~1.42; all-purpose flour ~0.53.

Liquid Oz to Dry Oz Conversion Table

US fl oz to oz (weight), assuming water (ฯ = 1.00 g/mL)
Fluid Ounces (US) Ounces (Weight)
0.50.522
11.043
22.086
44.173
66.259
88.345
1212.518
1616.691
2425.036
3233.382
* Assumes a rounded density of exactly 1.00 g/mL for this table. Real water density varies with temperature. For other ingredients, multiply table masses by the numerical density in g/mL.

How do you convert liquid ounces to dry ounces? Multiply US fl oz by 29.5735295625 mL/fl oz, multiply by the ingredientโ€™s density (g/mL), then divide by 28.349523125 g/oz; for Imperial fl oz use 28.4130625 mL/fl oz instead.

How do you convert dry ounces to liquid ounces? Multiply ounces by 28.349523125 g/oz, divide by density (g/mL), then divide by 29.5735295625 (US) or 28.4130625 (Imperial) to get fl oz.

Example Problem

Convert 12 US fl oz of honey to ounces (weight).

Use the formula with ฯ = 1.42 g/mL (typical honey): oz = fl oz ร— 29.5735 ร— ฯ รท 28.3495.

oz โ‰ˆ 12 ร— 29.5735 ร— 1.42 รท 28.3495 โ‰ˆ 17.78 oz