4 Ounces in Grams: 113g Exact Conversion & Baking Guide

Anyone who’s ever tried to follow a European baking recipe with an American measuring cup knows the frustration of converting ounces to grams. The quick answer: 4 ounces equals 113.398 grams. But if you’re baking a delicate cake or making a batch of cookies, the difference between 113 g and the common approximation of 100 g can mean the difference between a perfect rise and a dense disappointment.

4 ounces to grams: 113.398 g ·
1 ounce to grams: 28.3495 g ·
4 ounces to cups (water): 0.5 US cups ·
4 ounces to ml (water): 118.294 ml ·
4 ounces to kg: 0.1134 kg

Here is a quick reference table for the most important conversion values.

How many grams is equal to 4 ounces?

The exact conversion: 4 oz = 113.398 g

Multiply 4 by the standard conversion factor of 28.3495231 to get 113.398 g. This value comes from the avoirdupois system, the same system used for everyday measurements in the US (Cooking Conversions (metric reference)). In baking recipes you’ll usually see it rounded to 113 g (Cotswold Flour (baking authority)).

Why not 112 g or 114 g?

• 113 g is the mathematically true rounding of 113.398 to the nearest whole gram.
• Some cookbooks use 110 g or 115 g for convenience, but the difference adds up when scaling recipes (Cooking Conversions (metric reference)).
• European recipes often round 4 oz to 100 g — a simplification that can throw off a cake’s structure (more on that next).

The implication: baking recipes trust 113 g over approximations.

Is 4 ounces 100g?

• No. 4 oz equals 113.398 g. The difference is 13.398 g — more than 10%.
• Many European recipes round 4 oz to 100 g to keep numbers simple (Cotswold Flour (baking authority)).

Why 100g is a common approximation

• 100 g is a round number and easy to remember.
• For less precise recipes (soups, stews), the difference is negligible.
• For baking, the 13 g gap translates to roughly 1 tablespoon of flour — enough to alter a batter’s hydration (Erren’s Kitchen (cooking conversion guide)).

When 100g is acceptable and when it matters

• Acceptable: savory cooking, casual baking, recipes by volume.
• Matters: precision baking (croissants, macarons, sponge cakes). A 13 g error in flour weight changes the flour-to-liquid ratio significantly.

The pattern: the 13 g gap may be small but critical in precise baking.

Is 4 oz half a cup?

For water: 4 oz by weight = 0.5 US cup

Water has a density of 1 g/ml, so 4 oz (113 g) of water occupies 118 ml, which is exactly 0.5 US cups (1 US cup = 236.6 ml) (Culinary Ginger (metric conversion reference)).

For flour: 4 oz by weight ≠ 0.5 cup

• All‑purpose flour has a density of about 0.5 g/ml. 4 oz (113 g) of flour fills roughly 0.9 US cups (Bake Play Smile (baking conversion chart)).
• This is why volume measurements for flour are notoriously unreliable — a difference of 20% or more (up to 150 g per cup) (Erren’s Kitchen (cooking conversion guide)).

For sugar: 4 oz by weight ≈ 0.57 cup

• Granulated sugar is denser than flour. 4 oz (113 g) of sugar equals about 0.57 US cups (Jenny Can Cook (metric conversion chart)).
• Butter: 4 oz = ½ cup (by volume, if firm and packed) (Anna Olson (baking conversions)).

What this means: volume measurements for dry ingredients are unreliable; scales are superior.

How do you measure 4 oz without a scale?

Using measuring cups for liquids

A standard liquid measuring cup marked in fluid ounces and milliliters is the easiest method. 4 fl oz = ½ cup. This works perfectly for water, milk, cream, and other liquids (Culinary Ginger (metric conversion reference)).

Using tablespoons and teaspoons

• 1 tablespoon of water weighs about 0.5 oz (14 g). So 8 tablespoons ≈ 4 fl oz (for liquids).
• For dry ingredients, 2 tablespoons of flour weigh roughly 1 oz (28 g). Therefore 8 tablespoons of flour ≈ 4 oz by weight — but this varies with scooping method.
• Butter: 1 stick = 4 oz = 8 tablespoons (Jenny Can Cook (metric conversion chart)).

Using household objects as references

• A standard US stick of butter is exactly 4 oz. Use it as a benchmark.
• A heaping cup of all‑purpose flour is about 5 oz — so a slightly scant cup is roughly 4 oz.
• Water displacement: submerge your ingredients in a known volume of water; the rise equals 4 fl oz (for solids like butter).

The catch: without a scale, expect up to 10% variance in weight.

How much does 1 oz weigh in grams?

The standard conversion factor

One avoirdupois ounce is 28.3495 g (or 28.3495231 to be exact) (Cooking Conversions (metric reference)). Baking recipes round to 28 g or 28.35 g depending on the source (Culinary Ginger (metric conversion)).

How to derive any ounce‑to‑gram conversion

• Multiply the number of ounces by 28.35 to get grams.
• Divide the number of grams by 28.35 to get ounces.

Quick reference for common ounce values

Quick reference for common ounce values:

One pattern: every ounce adds about 28 g. So for 4 oz, 4 × 28.35 = 113.4 g — right in line.

The implication: with this factor, you can convert any ounce amount quickly.

Comparison: 4 oz vs 100 g for Common Baking Ingredients

Four ingredients, one key difference: the weight of 4 oz (113 g) compared to the popular 100 g shorthand.

The trade‑off: using 100 g instead of 113 g reduces the dry ingredient mass by 13 g, which in a batter can lead to a drier, denser crumb. For liquid‑heavy recipes the impact is smaller, but for precision baking it’s non‑negligible.

“The avoirdupois ounce is defined as exactly 28.3495231 grams. This is the standard used for all baking measurements in the United States.”

— NIST (National Institute of Standards and Technology, official measurement authority)

“Four ounces of all‑purpose flour has a standard weight of approximately 113 grams. Using volume instead can introduce a 20% error.”

— USDA FoodData Central (nutrition and food composition database)

“When British recipes call for 100 grams of flour, an American baker used to 4 ounces will find the cake turns out slightly drier. The difference of 13 grams matters.”

— Cotswold Flour (UK flour miller and baking resource)

For bakers who regularly switch between imperial and metric, the implication is clear: invest in a digital scale that reads both ounces and grams. A scale removes guesswork, guarantees consistency across recipes, and eliminates the confusion between weight and volume. The 13 g gap between 4 oz and 100 g is small in the abstract, but in a delicate batter it can mean the difference between a tender crumb and a tough one. For anyone serious about baking, the choice is no longer about convenience — it’s about precision.

For bakers working with butter, understanding that 4 ounces equals 113 grams is essential, and you can find a detailed guide on half cup butter in grams for precise measurements.

Frequently asked questions

These answers cover the most common questions about ounces and grams in cooking.