What does the Grams to Ounces Converter do?
The Grams to Ounces Converter turns any gram value into ounces (and ounces back into grams), using the avoirdupois ounce — the standard unit for cooking, baking, food labels, body weight, and any general weight measurement. Type a number in either field; the other updates instantly. The page also includes a built-in table of common kitchen weights (1 stick of butter, 1 cup of flour, 1 lb, 1 kg) so you can convert recipe quantities at a glance without typing.
For example: 100 g converts to 3.527 oz. 454 g is just over 1 lb (16 oz). 28.35 g is exactly 1 oz. The conversion is exact — 1 ounce is defined as exactly 28.349523125 grams as of the 1959 international yard and pound agreement.
When you'll use this conversion
Most of the world weighs in grams; the US and a few holdouts weigh in ounces and pounds. Recipes, food labels, fitness tracking, postage, and shipping all live at the boundary.
Cooking and baking. US recipes use cups and ounces; European and Australian recipes use grams. Converting between them is the daily reality of any home cook trying recipes from around the world. Baking especially benefits — a recipe calling for "200g of butter" needs converting to "7 oz" if you're using US-marked sticks (each 4 oz / 113 g).
Food labels and nutrition tracking. US nutrition facts use grams for serving size + macros (carbs, protein, fat) but ounces for total weight (e.g. "8 oz container"). Calorie-tracking apps mix both — some default to grams, others to ounces, and switching forces a mental conversion.
Postage and shipping. US postal rates use ounces (first-class is up to 13 oz). International postage is in grams. Pre-paid shipping labels need accurate weight in the destination's unit.
Body weight in fitness contexts. Bodybuilding and macro tracking in the US sometimes mixes lb-based body weight with gram-based food intake. Converting lets you keep one mental model.
Coffee. Specialty coffee uses grams universally for brewing ratios (e.g. 18g coffee : 30g espresso shot). If your scale shows ounces, you'll want to convert to follow brewing guides.
The math
1 ounce (avoirdupois) = 28.349523125 grams (exactly, by international agreement)
To convert grams → ounces: divide by 28.3495 (or multiply by 0.0353)
To convert ounces → grams: multiply by 28.3495
Worked example: a 200-gram block of butter.
- 200 g ÷ 28.3495 g/oz = 7.055 oz
- That's just over 7 oz, or about 1¾ sticks of US butter (each stick = 4 oz / 113 g)
The math has no rounding — the gram-to-ounce ratio was set in the 1959 international yard and pound agreement and hasn't changed. The 28.349523125 figure is exact, derived from defining 1 lb (16 oz) as exactly 0.45359237 kg.
Avoirdupois vs troy ounce — the distinction that matters
"Ounce" actually refers to two different units depending on what you're weighing:
- Avoirdupois ounce (28.3495 g) — used for cooking, food, body weight, packages, postage. Anything you'd weigh on a kitchen scale or bathroom scale. This converter uses avoirdupois.
- Troy ounce (31.1035 g) — used only for precious metals (gold, silver, platinum, palladium). About 10% heavier than the avoirdupois ounce.
If you're checking a recipe, weighing food, or shipping a package, you want avoirdupois. If you're buying gold or silver, you want troy — and our converter is the wrong tool. Spend a minute on a precious-metals-specific converter for those.
There's also a "fluid ounce" which measures volume not weight (and is also unit-system specific — US fl oz = 29.57 mL; UK imperial fl oz = 28.41 mL). Volume and weight aren't interchangeable except for water (where 1 g ≈ 1 mL by happy coincidence). For volume conversions, use the mL to fl oz Converter.
Common conversions
Reference values for the kitchen and shipping conversions you'll do most often:
| Reference | Grams | Ounces |
|---|---|---|
| 1 oz (about a slice of bread) | 28.35 | 1 |
| 1 stick of US butter | 113 | 4 |
| 1 cup of flour (all-purpose, lightly spooned) | 120 | 4.23 |
| 1 cup of sugar (granulated) | 200 | 7.05 |
| 1 cup of butter (2 sticks) | 227 | 8 |
| Half a pound (8 oz) | 227 | 8 |
| 1 pound (16 oz) | 454 | 16 |
| 1 kg | 1,000 | 35.27 |
| 1 lb of pasta (typical box) | 454 | 16 |
| USDA serving of meat (3 oz) | 85 | 3 |
Worth noting: cup-to-gram conversions vary by ingredient density. The same volume cup holds 120 g of flour but 200 g of sugar — sugar is denser. Recipes that specify weight (grams or ounces) are more reliable than volume; that's why professional bakers always weigh.
Tips
Tip: for baking accuracy, weigh dry ingredients in grams rather than measuring by volume. The same recipe can come out very different depending on how you scoop flour — packed measurements can be 30% denser than lightly spooned. A kitchen scale that reads in grams (and tares to zero) is one of the cheapest, highest-impact baking upgrades.
Quick mental conversion: 1 oz ≈ 28 g. For rough work, multiply ounces by 28 instead of 28.35 — error is less than 2%, which is well within recipe tolerance for most ingredients. For precise baking, use the converter.
"3 oz" of meat is one USDA serving. About the size of a deck of cards, or 85 g. Useful for portion-size sanity-checking when restaurants list "8-oz steak" (≈ 227 g).
Watch out for fluid ounces in liquid recipes. A recipe calling for "8 oz of milk" probably means 8 fluid ounces (about 240 mL), not 8 ounces by weight (227 g). Density of milk is close to water, so they're almost interchangeable for milk specifically — but for honey (1 fl oz = 1.42 oz by weight) the distinction matters a lot.
Related weight tools
Grams/ounces is one slice of weight conversion. A few related Microapp tools:
- For broader weight conversions across all common units (kg, lb, oz, stone, mg, gram), use the Weight Converter — shows all units in one view.
- For mass-related calculations including density and volume, the Mass Calculator handles formula-based work.
- For fluid ounces (volume, not weight — used in cooking liquids), use the mL to fl oz Converter. This is a different unit despite the shared "oz" abbreviation.
- For length conversions in the same imperial-to-metric workflow (in/ft/cm/m), the Length Converter covers all common units.
Frequently asked questions
How many grams in an ounce?
Exactly 28.349523125 grams in one avoirdupois ounce — the standard "ounce" used for cooking, food, and general weight. So 8 oz = 226.8 g (half a pound), 16 oz = 453.6 g (one pound), and 100 g = 3.527 oz. The number is exact, set by the 1959 international yard and pound agreement.
How many ounces is 100 grams?
100 grams = 3.527 ounces (≈ 3.5 oz). Useful rough conversion: 1 oz ≈ 28 g, so 100 g ÷ 28 ≈ 3.5 oz. The exact value is 3.5274 oz. For most cooking purposes, "3.5 oz" is precise enough.
What's the difference between weight ounces and fluid ounces?
Weight ounces measure mass; fluid ounces measure volume. They're only equal for water (where 1 fl oz ≈ 1 oz by weight, because water has a density of ~1 g/mL). For other ingredients the densities differ — 1 fl oz of honey weighs ~1.42 oz; 1 fl oz of olive oil weighs ~0.96 oz. This converter handles weight only. For volume, use the mL to fl oz Converter.
How many grams is one cup of flour?
About 120 g for all-purpose flour, lightly spooned into the cup. Different flours and packing methods change this — bread flour is denser (~127 g/cup), cake flour lighter (~115 g/cup), and "scoop and pack" flour can hit 150 g/cup. Professional bakers always weigh flour rather than measuring by volume, because the volume-to-weight ratio varies so much.
How many grams is a pound?
1 pound (lb) = 16 ounces = 453.59 grams. So a 1-lb steak is about 454 g, and a 5-lb bag of flour is about 2.27 kg. To convert lb to grams, multiply by 453.59. To convert grams to lb, divide by 453.59.
Why are kitchen scales and bathroom scales both showing "ounces" — are they different?
No, they both use avoirdupois ounces. The distinction is the precision: kitchen scales typically show to 0.1 oz / 1 g, while bathroom scales show to 0.5 lb (8 oz) at best. Avoirdupois is the standard for both. Troy ounces (used for precious metals) only appear on jewelers' scales and gold-bullion contexts — and the difference is meaningful enough (10%) that you'd notice immediately.
Is my input saved or sent anywhere?
No. The conversion runs entirely in your browser using JavaScript — nothing is sent to a server, logged, or stored. Once you close the tab, your inputs are gone.