Oz to Grams Converter

Need to convert oz to grams? This free online oz to grams converter does it in your browser: type a value in oz and the g answer appears as you type, alongside the same figure in every other weight & mass unit. Ounce and Gram describe the same quantity on two different scales, so the oz to grams conversion is a single arithmetic step once you know the exact factor. Nothing is uploaded and there is no sign-up — the answer is computed on your device as fast as you can type.

The oz to grams formula

One oz is 28.3495 g:

g = oz × 28.3495
oz = g × 0.035274

That is the whole oz to grams formula: multiply to go one way, divide — or multiply by the inverse — to come back. The factor is a defined constant rather than a measurement, so a oz to grams conversion done this way carries no uncertainty of its own; the only open question is how many decimal places to display, which is covered further down.

Worked example

10 oz = 283.4952 g. Enter 10 in the box above and you will see exactly that, plus the value carried across the rest of the weight scale so you can sanity-check it against a unit you already recognise. It is the quickest way to convert oz to grams when the answer has to be exact rather than estimated.

How to convert oz to grams by hand

1. Write the value down in oz — 25 oz is used here.
2. Multiply it by 28.3495, because 1 oz = 28.3495 g.
3. Read the answer: 25 oz = 708.7381 g.
4. To come back, divide by 28.3495, or multiply by 0.035274 instead — 1 g = 0.035274 oz.

Oz to Grams conversion table

Every figure below comes from the same engine as the box at the top of this page, shown at its Automatic precision, so each row is exactly what you would see after typing that value in. Treat it as a ready-made oz to grams chart for the values people reach for most.

Why convert oz to grams?

oz to grams questions rarely arrive alone: they show up when metric labels meet imperial scales — recipes, parcel postage, gym plates and luggage limits. In each case a oz reading has to become g — or be checked against one — before it can be used, and a guessed conversion is how the wrong size gets ordered, the wrong setting gets dialled in or the wrong amount gets poured. This free weight converter exists for that moment: the oz to grams answer is exact, the full weight table sits one glance away, and everything runs locally in the browser — no sign-up, and none of the values you type are uploaded anywhere.

One oz in every weight unit

The 28.3495 g figure the converter shows for 1 oz is one row of this table — the row it defaults to. The others are here so a single reading can be checked against any further weight & mass unit without running the conversion twice.

Estimating oz to grams without a calculator

One habit worth keeping is to memorise two anchor points on the oz-to-grams line: 10 oz is 283.4952 g, and 100 oz is 2,834.95 g — both computed by the same engine as the converter above, not rounded by hand. With those anchors in mind, a mental oz to grams estimate becomes a matter of proportion: a value between the anchors has an answer between them too, and a mental conversion that lands far outside them is a sign that the factor has almost certainly been inverted. The converter above is there for every time an estimate is not good enough.

Which direction the numbers move

Because 1 oz = 28.3495 g, converting oz to grams increases the size of the number: 100 oz becomes 2,834.95 g, while 100 g becomes 3.5274 oz. If a result moves the other way, the factor has been inverted — the two directions are reciprocals and never the same number.

How many decimals to keep

The relationship between oz and g is a defined constant, but written out in decimal it runs past eight places, so every figure on screen is a rounding of it. Automatic shows 28.3495, which is within 0.000082% of the true quotient, and the menu (Automatic, whole numbers, or 2, 4, 6 and 8 decimal places) keeps more or fewer digits when a specification asks for a fixed count.

oz to grams in the real world

The avoirdupois ounce is 28.35 g but the troy ounce that prices gold is 31.10 g — a 10% gap and the oldest unit trap in commerce. Postal first-class letters historically turn on one ounce, about 28 g. A regulation baseball weighs 5 oz, roughly 142 g, while a cricket ball at 160 g feels heavier in hand for reasons this pair explains.

When people actually need oz to grams

Butter and deli counters produce most of the traffic: a US stick of butter is 4 oz, which is 113 g, and every metric cake adapted from a British-American cookbook has met that number. Postcards and envelopes keep the smaller version — 3.5 oz of mailing allowance is about 99 g, and the food-label dual declaration of both is a legal requirement in the US for exactly this kind of package.

About these units

Mass conversions are likewise exact. The pound is defined as precisely 0.45359237 kilograms, so ounces, pounds, stones and tonnes all resolve back to the kilogram by multiplication without any empirical uncertainty.

Converting the other way

Press Swap to turn this into a g-to-oz converter in place. The inverse factor, 1 g = 0.035274 oz, is shown in the arithmetic panel so you can check the reverse calculation independently.

More weight & mass converters

The same engine also powers Kg to Grams (1 kg = 1000 g), Lbs to Oz (1 lb = 16 oz), Kg to Stone (1 kg = 0.157473 st) and every other weight pair on this site, so the arithmetic is identical whichever two units you end up needing.