How Many Grams in an Ounce, Plus a Grams to Ounces Chart

One ounce holds 28.35 grams, and for almost any recipe you can round that to a flat 28. That single figure answers how many grams in an ounce, and it barely shifts whether you are weighing chocolate, coffee beans, or a pinch of spice. If you cook from European recipes or track food by weight, converting grams to ounces is the math you reach for most.

The reason it feels slippery is that an ounce is not a round metric number. It sits at 28.349523125 grams by international definition, so the tidy conversions we all memorize are gentle roundings. Learn the exact value and one easy rule of thumb and you'll stop stalling at recipes written the other way.

How Many Grams in an Ounce, the Exact Number

The avoirdupois ounce, the one used for food and produce, weighs 28.349523125 grams. That standard sits behind every kitchen scale sold in the US. Most charts print it as 28.35 g, and everyday cooks drop it to 28 g with no real loss on the plate.

There is a second ounce worth knowing about. Gold and silver trade by the troy ounce, which is heavier at about 31.10 grams. If you came here to weigh jewelry or coins, our troy ounce guide covers that case in full.

One ounce is 28.349523125 grams by definition. Round it to 28 and your cookies will never know the difference.

The Grams to Ounces Formula You Can Do in Your Head

To turn grams into ounces, divide the grams by 28.35. To go the other way, multiply the ounces by that same number. That is the whole formula, and it holds for anything from a 40 gram egg to a 500 gram bag of pasta.

If you'd rather skip decimals, round the divisor to 28. A 200 gram block of butter lands near 7 ounces either way. When you want it exact, our grams to ounces converter does the decimals for you.

A quick mental math trick

Multiplying grams by 0.035 gets you ounces without long division. So 100 grams times 0.035 lands near 3.5 ounces, close enough for a shopping list. The reverse move, multiply ounces by 28, is even faster for grams oz math at the counter.

A Grams to Ounces Chart for the Kitchen

Here is the conversion chart most home bakers end up taping inside a cabinet. It runs from a single ounce up to a full pound, listing both the exact grams and the rounded grams you'll actually key into a scale.

Notice how 16 ounces lands at 454 grams, not a clean 450. That small gap is why professional recipes are written in grams first, as this conversion breakdown shows. For quick reads, the rounded column is all you need.

Ounces to Grams, and 100 Grams to Oz

Going the other direction is just as simple. To turn ounces to grams, multiply by 28.35, so 4 ounces in grams works out to 113 grams. That is the weight of a standard chicken breast portion or a small chocolate bar.

The metric side trips people up at round numbers. Ask how 100 grams to oz shakes out and the answer is 3.53 ounces, not a clean 4. Our ounces to grams converter handles the reverse trip when a US recipe hands you ounces.

A gram is about the weight of a raisin. An ounce is roughly 28 of them, near one slice of sandwich bread.

What the Right Ounce Is Worth in Your Baking

Weighing instead of scooping is where the conversion pays off in money. A packed cup of flour can carry 20 grams more than a spooned one, and that extra flour is what turns a tender cake dry. Our cup of flour in grams guide breaks that down by type.

The same logic runs through coffee, protein, and shipping. Dialing a coffee shot to 18 grams instead of eyeballing a scoop stretches a bag several brews further. Over a year, getting grams and ounces right adds up to real savings and fewer wasted batches.

Weight Ounces vs Fluid Ounces, Don't Mix Them Up

The biggest conversion mistake has nothing to do with grams. It is treating a fluid ounce like a weight ounce. Fluid ounces measure how much space a liquid fills, while the ounces on your scale measure mass.

For water they nearly line up, since a fluid ounce of water weighs close to an ounce. For honey, oil, or flour they drift apart fast, which is why a scale in grams beats a measuring cup for baking. This grams and ounces reference is handy when you want to check one ingredient.

Grams and Ounces Questions People Ask

How many grams per ounce of gold?

Gold is measured in troy ounces, and one troy ounce is 31.1034768 grams. That is heavier than the 28.35 grams in a standard kitchen ounce, so never use a food conversion for precious metals. A food scale reading will underprice your metal.

How do I convert grams to ounces without a calculator?

Divide the grams by 28, or by 28.35 if you want more precision. For a rough field estimate, multiply the grams by 0.035 instead. Both land within a fraction of an ounce, which is plenty for cooking or a quick convert g to oz check on a package.

How many ounces is a tablespoon?

A US tablespoon equals half a fluid ounce, so two tablespoons make one fluid ounce of volume. By weight it varies with the ingredient, since a tablespoon of water weighs about 15 grams while a tablespoon of honey weighs closer to 21. That is the fluid versus weight ounce gap again.

Is 100 grams the same as 4 ounces?

Close, but not exact. 100 grams equals 3.53 ounces, while 4 ounces is 113 grams. The two get swapped a lot on nutrition labels, so when a portion really matters, weigh it in grams and convert once.

Need to check how many grams in an ounce without hunting for a scale? Scale for Grams reads an object's weight from a single photo and shows it in grams, ounces, or pounds in seconds. Get the app here: iOS.