Does the 1-ounce-to-gram answer change depending on the ingredient?

No. Ounces and grams both measure mass, so the conversion is fixed regardless of the substance. 1 ounce of any material equals 28.35 grams.

What is the exact formula to convert 1 ounce to grams?

Grams = Ounces times 28.349523125. For 1 ounce: 1 times 28.349523125 = 28.3495 grams.

How many pounds is 1 ounce?

1 ounce equals 0.0625 pounds, or 0 lb 1.00 oz in mixed pounds and ounces. (1 pound = 16 ounces = 453.59237 grams.)

Is 1 ounce the same in troy ounces as in regular ounces?

No. 1 standard ounces equals 28.35 grams, while 1 troy ounces equals 31.10 grams. The troy ounce is about 9.7 percent heavier than the standard ounce and is used only for precious metals.

What is the most accurate way to measure 1 ounce?

Use a calibrated digital scale that displays both ounces and grams. A reading of 1 oz on an imperial scale is identical to 28.35 g on a metric scale, only the unit label differs.

1 Ounce to Grams Conversion

Q: How many grams is 1 ounce?

1 ounce equals 28.35 grams, or 28.3495 g at full precision. In metric units this is 0.0283 kilograms.

1 Ounce to Grams Calculator

Amount

From

Decimal places

1 oz = 28.3495 gAlso: 1 oz = 0.0283 kilograms

1 Ounce to Grams — 1 oz to g Conversion

Looking up how many grams are in 1 ounce? Here’s the precise answer with every related unit and a working calculator. In short: 1 ounce equals 28.35 grams, or 0.0283 kilograms in metric units. The calculator above handles the reverse direction and troy ounces too, at the press of a button.

Because the ounce-to-gram relationship is fixed by international agreement, the answer to “how many grams is 1 ounce?” never changes with the ingredient — unlike ounces-to-cups or ounces-to-teaspoons, which depend on density. The exact factor (1 oz = 28.349523125 g) was set by the 1959 International Yard and Pound Agreement and is maintained by NIST.

Contents hide

1 1 Ounce to Grams Conversion

1.1 1 Ounce to Grams Calculator

2 1 Ounce to Grams — 1 oz to g Conversion

2.1 What is 1 Ounce in Grams?

2.2 How to Convert 1 Ounce to Grams

2.3 1 Ounce — Multi-Unit Reference Chart

2.4 1 Ounce Converted to Other Weight Units

2.5 One Ounce in Context

2.6 Ounces & Grams — A Quick Primer

2.7 FAQ: 1 Ounce to Grams

2.8 Nearby Ounces to Grams Conversions

What is 1 Ounce in Grams?

1 oz = 28.35 g
= 0.0283 kilograms

Grams

28.35 g

Full precision

28.3495 g

Kilograms

0.0283 kg

Pounds + ounces

0 lb 1.00 oz

Real-world check: 1 ounce is roughly a slice of bread or a single slice of cheese — useful when you don’t have a scale handy.

How to Convert 1 Ounce to Grams

Step 1: Use the Exact Conversion Factor

Ounces and grams both measure mass — how much matter an object contains — so the conversion is a single, fixed multiplication. There’s no density variable and no ingredient adjustment. The internationally defined relationship is:

1 ounce = 28.349523125 grams | 1 gram = 0.03527396195 ounces

This factor was set by the 1959 International Yard and Pound Agreement signed by the US, UK, Australia, Canada, New Zealand, and South Africa, and is published by NIST as part of Handbook 44. It applies wherever the standard ounce is used.

Step 2: Apply the Formula to 1 Ounce

To turn 1 ounce into grams, multiply by the grams-per-ounce factor:

Grams = 1 × 28.349523125 = 28.3495 g

Quick mental math: Multiplying by 28.35 is awkward in your head. A useful trick: multiply ounces by 28 for a fast estimate, then add about 1.2 %. For 1 oz that gives roughly 28.35 g — very close to the exact answer.

Step 3: Worked Reverse Example

Goal: Confirm 28.35 grams converts back to 1 ounce.

1. Use the reverse formula:

Ounces = grams ÷ 28.349523125

2. Plug in 28.35 g:

28.35 ÷ 28.349523125 ≈ 1 oz

Small rounding differences appear because the displayed gram value is truncated to two decimals — the calculator at the top of this page uses the full-precision factor and will round-trip exactly.

Step 4: Decide Which Ounce You Need

Not every “ounce” is the same unit. Match the ounce to the situation:

Standard ounce (28.349523125 g) — food, kitchen scales, postage, retail, nutrition labels. Sometimes called the “avoirdupois” ounce in formal references. This is what 1 oz = 28.35 g refers to by default.
Troy ounce (31.1034768 g) — gold, silver, platinum, palladium. 1 troy oz = 31.10 g.
Fluid ounce — a volume unit, not a weight. Don’t mix it up with the standard mass ounce.

Rounding rules used on this page: Grams are displayed to two decimal places for everyday use and four decimals for precision tasks. The full-precision factor (28.349523125) is exact — any rounding error in the result comes from rounding the gram output, not from the conversion itself.

1 Ounce — Multi-Unit Reference Chart

Download Chart (PNG)

1 Ounce Converted to Other Weight Units

Unit	Value	Notes
Grams	28.35 g	Standard everyday gram value
Grams (full precision)	28.3495 g	Four decimal places
Kilograms	0.0283 kg	SI / metric
Milligrams	28349.52 mg	Dosages / lab use
Pounds	0.0625 lb	1 lb = 16 oz
Pounds + ounces	0 lb 1.00 oz	Mixed imperial
Troy ounces	0.9115 oz t	For precious metals only
Stones (st)	0.0045 st	UK body-weight unit; 1 st = 14 lb
Drams	16.00 dr	1 oz = 16 drams
Grains	437.50 gr	1 oz = 437.5 grains
Pennyweights	18.23 dwt	Jewellery; 1 dwt = 1.5552 g
Carats	141.75 ct	Gems; 1 ct = 200 mg

One Ounce in Context

Weight class: ultra-light

1 ounce is best described as a slice of bread or a single slice of cheese. On a US postal scale or imperial kitchen scale, you’ll see a reading of 1 oz; on a metric scale the same item registers as 28.35 g. That difference is purely the unit you’re reading — the mass itself is identical.

For US postal shipping, scales typically display ounces; international labels usually require grams. Knowing both removes any guesswork at the counter.

For larger reference: 1 ounce also equals 0.0625 pounds (0 lb 1.00 oz) and 0.0283 kilograms. If you’re weighing precious metals, the same value treated as troy ounces would weigh 31.10 grams — but for everyday food, postage, or retail purposes, the standard ounce is always what’s meant.

Ounces & Grams — A Quick Primer

The Ounce (oz) — Imperial Mass

An ounce is an imperial / US customary unit of mass, equal to 1/16 of a pound. The standard ounce was fixed at exactly 28.349523125 grams by the 1959 International Yard and Pound Agreement signed by the US, UK, Australia, Canada, New Zealand, and South Africa. The abbreviation is “oz.” Ounces appear on virtually every US food label, postal scale, and retail package, and on UK and Australian labels alongside metric values. 1 ounce is a value commonly seen in ultra-light-weight contexts.

Standard ounce (avoirdupois)

= 28.349523125 g (exact). The default ounce for food, postage, and consumer goods. When a recipe or label says “oz” without qualification, this is the unit. 1 oz = 28.35 g.

Troy ounce

= 31.1034768 g. Used for gold, silver, platinum and palladium. About 9.7 % heavier than the standard ounce.

Apothecaries’ ounce

= 31.1034768 g. Historically used in pharmacy. Equal to the troy ounce; rarely used today.

Fluid ounce

A volume unit (≈ 29.57 mL US, 28.41 mL UK), not a mass unit. Never use it for a weight conversion.

The Gram (g) — Metric Mass

A gram is the metric system’s everyday unit of mass, defined as one-thousandth of a kilogram (the SI base unit). The kilogram has been defined since 2019 in terms of Planck’s constant under the SI redefinition, making the gram an absolute reference that doesn’t depend on any physical artifact. Grams are the standard unit on most kitchen scales outside the United States and on every pharmaceutical and laboratory scale worldwide.

Why the Conversion Is Exact

Unlike ounces-to-cups or ounces-to-teaspoons (where the answer depends on the ingredient’s density), ounces-to-grams is a fixed mass-to-mass conversion. The 1959 International Yard and Pound Agreement defined the pound as exactly 0.45359237 kg. Sixteen ounces fit in a pound, so one ounce is exactly 28.349523125 grams — and the conversion of 1 ounce to grams is exact to the limits of arithmetic, not an approximation.

FAQ: 1 Ounce to Grams

❓ How many grams is 1 ounce?

1 ounce equals 28.35 grams, or 28.3495 g at full precision. In metric units this is 0.0283 kilograms.

⚖️ Does the answer change for different ingredients?

No. Both ounces and grams measure mass, so the conversion is fixed regardless of what you’re weighing. 1 ounce of flour, water, sugar, or lead all equal 28.35 g — they just take up wildly different amounts of space. (The “different for each ingredient” rule only applies when one side is a volume unit such as cups or teaspoons.)

📏 What’s the exact formula?

Grams = Ounces × 28.349523125 | Ounces = Grams ÷ 28.349523125

For 1 ounce: 1 × 28.349523125 = 28.3495 g.

🥇 What if my recipe is for gold, silver or another precious metal?

Treat the value as troy ounces instead. The factor is 31.1034768 g per troy ounce, so 1 troy oz = 31.10 g. Bullion bars, coin specifications and gold/silver spot prices are quoted in troy ounces by global convention.

🎯 What’s the most accurate way to measure 1 ounce?

Use a calibrated digital scale that can display either ounces or grams. Most modern kitchen and postal scales let you toggle the unit at the press of a button — switching to grams before weighing removes one rounding step. Avoid converting through volume units (teaspoons, cups, fl oz) when you actually need a mass.

Pro tip: If your scale shows grams only, the correct reading for 1 ounce is 28.35 g.

🔁 How do I reverse-check this?

Divide the gram result by 28.349523125 and you should recover 1 oz (with a small rounding tolerance if you used a truncated gram value). The calculator at the top of this page does the round-trip at full precision.

📊 Quick reference: 1 oz in nearby units

Unit	From 1 oz	1 oz equals
Grams	28.35 g	28.35 g
Kilograms	0.02835 kg	0.0283 kg
Milligrams	28,349.52 mg	28349.52 mg
Pounds	0.0625 lb	0.0625 lb
Troy ounces	0.9115 oz t	0.9115 oz t
Drams	16 dr	16.00 dr
Grains	437.5 gr	437.50 gr

All factors confirmed against NIST Handbook 44, Appendix C.

Nearby Ounces to Grams Conversions

Explore the conversions immediately surrounding 1 ounce. These ten pages give you a complete picture of how the gram value changes one ounce at a time around 1 oz:

Browse the full Ounces to Grams conversion hub for every ounce value from 1 to 1000, plus printable charts, troy-ounce references, and the reverse Grams to Ounces calculator.