31 Grams Is How Many Ounces

You're standing in the kitchen, recipe in hand, and it calls for 31 grams of butter. Also, your scale only does ounces. Or maybe it's 31 grams of flour, or yeast, or that expensive saffron you bought for a special dish. Or worse — you only have measuring cups.

We've all been there. That's an oddly specific number. 35 (the textbook ounce). Not 30. Not 28.Just... And 31 grams? 31.

Here's the short answer: 31 grams equals approximately 1.093 ounces.

But if you're cooking, baking, weighing supplements, or measuring precious metals, "approximately" can mean the difference between a perfect rise and a dense brick. Let's break down what this conversion actually means in practice — and why that extra 0.093 ounces matters more than you think.

What Is a Gram and an Ounce Anyway

Before we get deeper, let's clear up a confusion that trips up more people than you'd expect.

A gram is a metric unit of mass. Which means it's part of the International System of Units (SI). Which means one gram is one-thousandth of a kilogram. The metric system is decimal-based, which makes scaling recipes up or down straightforward — at least on paper.

An ounce (oz) is an imperial unit. Actually, it's two different units depending on what you're measuring:

• Avoirdupois ounce — the standard ounce used for almost everything in daily life (flour, butter, body weight, shipping packages). 1 avoirdupois ounce = 28.349523125 grams exactly.
• Troy ounce — used only* for precious metals (gold, silver, platinum) and gemstones. 1 troy ounce = 31.1034768 grams exactly.

Notice something? 31 grams is almost exactly one troy ounce. That's not a coincidence — it's why this specific number shows up in jewelry and bullion contexts.

For almost everything else — cooking, baking, supplements, postage — you're dealing with avoirdupois ounces. And 31 grams ÷ 28.3495 = 1.0935 ounces.

The math, if you care

31 g ÷ 28.349523125 g/oz = 1.0934928 oz

Rounded to three decimals: 1.093 oz

Rounded to two decimals (what most kitchen scales show): 1.09 oz

Rounded to one decimal (what cheap scales show): 1.1 oz

That rounding? It adds up.

Why 31 Grams Specifically Keeps Showing Up

You might wonder: why not 30 grams? In practice, why not 28. In real terms, 35? Why does 31 grams appear in so many specific contexts?

Precious metals and jewelry

Basically the big one. Now, a troy ounce is 31. 1035 grams. So 31 grams is just under* a troy ounce — about 99.67% of one. If you're buying or selling gold, silver, or platinum in gram increments (common in many international markets), 31 grams is a meaningful reference point. It's close enough to a troy ounce that people mentally round it, but the difference matters when metal prices are $60+ per gram.

Supplement serving sizes

Flip over a creatine, protein, or collagen container. Many list a serving as 30g or 31g. Why? Now, because 30g is a clean metric number, and 31g is roughly 1. 1 ounces — a clean-ish imperial number. Manufacturers pick round numbers in both* systems to make labels look neat in multiple markets.

Baking formulas

Professional bakers work in baker's percentages — everything relative to flour weight. A formula might call for 31g of yeast, salt, or a preferment portion because it works out to a clean percentage at a given batch size. Home bakers scaling down from pro formulas hit these odd numbers constantly.

Coffee dosing

Specialty coffee recipes often specify 30-32g of coffee for a double shot or a specific brew ratio. 31g sits right in that sweet spot. That's why 1g precision scale (common for espresso), you'll see 31. If you're weighing beans on a 0.0g often enough that the ounce equivalent becomes relevant.

How to Convert 31 Grams to Ounces (Without Losing Your Mind)

Method 1: The exact formula

Ounces = Grams ÷ 28.349523125

Plug in 31: 1.0934928 oz

Method 2: The mental shortcut (accurate enough for cooking)

Divide by 28.35 instead of the full constant.

31 ÷ 28.35 = 1.09347...

Difference: 0.Still, 00002 ounces. You will never measure this difference. Your scale doesn't even display it.

Method 3: The "close enough" rule of thumb

1 gram ≈ 0.035 ounces

Want to learn more? We recommend how many ounces in 4 quarts and how many weeks is 54 days for further reading.

31 × 0.035 = 1.085 oz

Error: ~0.On top of that, fine. For yeast or spices in a small batch? 008 oz. For flour or sugar? Maybe not.

Method 4: Use your scale's unit button

Seriously. Almost every digital kitchen scale made in the last 15 years has a unit toggle. But press it until it reads "oz" or "g/oz. " Weigh 31g. On the flip side, read the ounces. Done.

But — and this matters — **check your scale's resolution.In practice, ** A scale that reads to 1g increments will show "1 oz" for anything from 28g to 33g. A 0.So naturally, 1g scale shows "1. 1 oz" for 31g. A 0.Think about it: 01g scale shows "1. 09 oz." The scale's precision dictates your conversion precision, not the math.

Common Mistakes People Make With This Conversion

Using the wrong ounce

I've seen people weigh gold on a kitchen scale, see "1.Think about it: 3% difference is $6. 09 oz," and think they have a troy ounce. Which means at $2,000/oz gold, that 0. 997 troy ounces. Here's the thing — 09 avoirdupois* ounces = 31 grams = 0. They have 1.Worth adding: they don't. Not huge, but it scales.

Conversely, someone converting a recipe might accidentally use the troy conversion (31.1035) instead of avoirdupois (28.Now, 3495). 31g ÷ 31.1035 = 0.997 oz. Practically speaking, they'd under-measure by ~9%. In baking, that's a failed loaf.

Rounding too early

Recipe says 31g salt. " You measure 1.1 oz on a 0.1 oz.This leads to 1-oz-resolution scale. You convert: "about 1.Actual weight: 1.1 × 28.

Actual weight: 1.Worth adding: 1 × 28. 35 ≈ 31.Practically speaking, 185 g – a hair above 31 g. Consider this: in most kitchen scenarios that’s fine, but if you’re a precision baker or a coffee roaster, a 0. 1‑g drift can mean the difference between a perfect crust and a slightly off‑balance extraction.

4.4 When “Close Enough” Becomes “Close Enough to Fail”

• Yeast: A 10 % over‑measure in a 1‑lb loaf can cause the dough to over‑ferment and collapse.
• Spices: 1 % too much cinnamon in a batch of 500 g can turn a recipe into a cinnamon‑overdose.
• Coffee: Espresso machines calibrated to a 1 % variance can produce a noticeably bitter shot ryd.

The rule of thumb “1 g ≈ 0.035 oz” is perfect for a grocery‑store bag of flour, but for the micro‑ingredients that make a loaf or latte distinct, you’ll want the full‑precision method or a scale that displays ounces directly.

Quick Reference Table

If your recipe lists 31 g and you only have a 0.1 oz‑resolution scale, round to 1.Plus, 1 oz. 01 oz scale, you’ll see 1.If you have a 0.09 oz and can weigh 31 g precisely.

Tips for the “Skeptic” Among Us

1. Know your scale’s precision. A 1‑g scale will always round 31 g to “1 oz” or “1.1 oz” depending on its rounding logic. Check the manual for “tare” and “unit” settings.
2. Use a conversion app for quick checks. Most smartphone calculators have a weight conversion tool; just type “31 g to oz” and you’ll get 1.093 oz instantly.
3. Double‑check troy vs. avoirdupois. When dealing with precious metals or fine spices, the difference between 28.35 g and 31.10 g can be critical. Stick to the standard kitchen conversion unless you’re in a bullion‑trading context.

Final Thoughts: Precision Is a Choice, Not a Curse

Converting 31 grams to ounces might seem trivial, but the way you handle that handful of grams can ripple through an entire recipe or a batch of coffee. Remember:

• Exact math gives you the most accurate number, but is rarely necessary for everyday cooking.
• Mental shortcuts keep you moving when you’re in the kitchen and don’t need milligram precision.
• Scale‑based conversion is the most reliable because it reflects the actual instrument you’ll use.

In the end, the most important conversion is the one you trust. Still, pick the method that fits your workflow, keep an eye on your scale’s resolution, and when in doubt, round to the nearest tenth of an ounce and check the total weight on your scale. Your dough, your brew, and your taste buds will thank you.