How many grams is 1 ounce in cooking?

One ounce equals 28.3495 grams (avoirdupois). This is the standard cooking ounce used in US recipes — the same as a regular ounce. Troy ounces (31.1 g) are only used for precious metals and never appear in recipes.

How many grams is 4 ounces of flour?

Four ounces equals 113.4 grams of flour by weight. However, because flour compacts differently depending on how it was measured (scooped vs. spooned), using a scale gives more consistent results than converting from cups.

Is 8 oz exactly 250 grams?

No. Eight ounces is 226.8 grams (8 × 28.3495). The 250 g figure is a common approximation used in some packaged products, but for baking accuracy you should use the precise value.

What is the exact ounce-to-gram conversion factor?

The exact factor is 1 oz = 28.349523125 g, defined by international agreement. For most cooking purposes, 28.35 g/oz is close enough; this tool uses the full precision value.

How do I scale a recipe from 4 to 8 servings using this tool?

Use the Recipe Scaler section: enter your original servings (4), target servings (8), and the original ingredient weight in ounces. The tool multiplies the weight by 8/4 = 2 and shows the scaled result in both ounces and grams.

Why do European recipes use grams instead of ounces?

Grams measure actual mass, so they are consistent regardless of how densely an ingredient is packed. European and professional baking recipes prefer grams for accuracy and reproducibility. Converting US ounce measurements to grams lets you use those recipes on a digital kitchen scale.

Ounces to Grams Converter (Cooking)

Name: Ounces to Grams Converter (Cooking)
Availability: InStock
Author: Nham Vu

Enter an ingredient weight in ounces and get the exact gram equivalent — with a recipe scaler and common ingredient reference table.

Ounces to Grams

Weight in Ounces (oz)

Grams

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g (avoirdupois)

Rounded (1 decimal)

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practical kitchen rounding

Recipe Scaler

Scale an ingredient weight when changing serving count.

Original Servings

Target Servings

Ingredient Weight (oz)

Scaled Oz

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Scaled Grams

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Common Ingredient Reference

Click a row to load it into the converter above.

Ingredient	Serving	Oz	Grams

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Summary

Enter an ingredient weight in ounces and get the exact gram equivalent — with a recipe scaler and common ingredient reference table.

How it works

Enter the weight in ounces in the input field.
The gram result appears instantly with three decimal places.
Use the Recipe Scaler to multiply the weight by a serving ratio.
Click any row in the Ingredient Reference table to load that weight into the converter.
Press Copy to copy the gram value to your clipboard.

Use cases

Converting a US recipe from ounces to grams for a digital kitchen scale.
Scaling a baking recipe up or down when changing serving count.
Checking how many grams of flour, sugar, or butter a US cookbook recipe requires.
Verifying ingredient weights when following a metric recipe alongside an imperial one.
Converting packaged food weights listed in ounces to grams for international nutrition labels.
Teaching cooking measurements to students moving from imperial to metric units.

Frequently Asked Questions

Last updated: 2026-07-24 · Reviewed by Nham Vu