Troy Ounces to Grams Chart

Short answer

1 ounce is 31.1 grams. The chart covers every common amount for this conversion.

1 ounce comes to 31.1 grams. The chart covers the amounts people actually look for, and each has its own line further down the page.

Ounces to grams: full chart

Ounces	Grams
1/4 oz	7.78 g
1/2 oz	15.6 g
1 oz	31.1 g
2 oz	62.2 g
3 oz	93.3 g
4 oz	124 g
6 oz	187 g
8 oz	249 g
12 oz	373 g
16 oz	498 g

Working through the amounts you will actually use

1 ounce is 31.1 grams. Take the 1 ounce figure of 31.1 grams and multiply by 1 to get there. 2 ounces is 62.2 grams. That is 31.1 multiplied by 2, since 1 ounce is 31.1 grams. 4 ounces is 124 grams.

Take the 1 ounce figure of 31.1 grams and multiply by 4 to get there. 8 ounces is 249 grams. Take the 1 ounce figure of 31.1 grams and multiply by 8 to get there.

Doing this one in your head

To go from ounces to grams, multiply by 31. One ounce is 31.1 grams. That ratio holds at every size, from a spoonful to a stockpot. Going back the other way, one gram returns 0.032 ounce. No weighing is involved, so there is nothing to get wrong at the scale.

Following it through once

Say a batch you are making for a crowd asks for 3 ounces, and your equipment is only marked in grams. Take the one-ounce figure of 31.1 grams and apply it 3 times: 93.3 grams. Pour to that mark and move on. The ingredient plays no part here at all.

The definition behind it

This one is fixed by definition rather than measured, so it carries no rounding and no dependence on what is being weighed. One ounce is exactly 31.1 grams, and every row above is that one ratio multiplied out.

Because the definition is exact, the only error that can enter this conversion is the one introduced by rounding it yourself.

Chart converting ounces to grams of gold — From a quarter ounce upward, in one image.

The troy ounce is a different unit

Gold and silver are weighed in troy ounces at 31.10 g each, against 28.35 g for the ounce used for food. Nothing in a kitchen uses the troy ounce.

Measuring cups and a kitchen scale arranged on a worktop — The tools that settle this one.

How to read the chart

Read down to your amount, then across. Amounts the table skips can be built by adding two rows together, since the relationship is a straight multiple throughout.

What the answer depends on

Nothing. This conversion is fixed by definition, so it holds regardless of ingredient, temperature or brand. That is what makes it safe to scale a recipe by.

Going the other way: grams to ounces

Grams	Ounces
2 1/2 g	0.08 oz
5 g	0.161 oz
10 g	0.322 oz

Measuring it properly

Weigh into the bowl you are already using rather than a second one. Every transfer leaves a little behind, and on small quantities that residue is a real fraction of the total.

When rounding is safe and when it is not

The test is whether the dish can still be corrected after tasting. If it can, round; if the decision is locked the moment it goes in the oven, do not.

The commonest slip

Trusting a scale below its useful floor. Under a few grams most kitchen scales round to the nearest step and show a tidy number that was never measured.

Weighing the container along with the contents. Without pressing tare the packaging rides into every reading, and it is a constant error rather than a random one.

Where this conversion turns up

Scaling a recipe up for a crowd is the other place it appears. 1 ounce is 31.1 grams, and every other quantity follows from getting that one right.

Anyone cooking along with a video is converting on the fly. 1 ounce is 31.1 grams is worth having settled before the pan is hot.

What the rounding actually costs

The exact figure for 1 ounce is 31.1. Written the way most cooks would write it, 31 grams, it is out by 0.103 — about 0.33 per cent. On one batch that is invisible.

Scaled four times the gap is 0.414, which is where it starts to show in anything that has to set.