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Ounces to Grams Converter (oz to g)

Convert ounces to grams and grams to ounces with exact NIST international avoirdupois precision.

Quick Answer:1 ounce (oz) is equal to exactly 28.349523125 grams (g). To convert ounces to grams, multiply your ounce value by 28.3495.

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How to Use the Ounces to Grams Converter (oz to g with Exact NIST Precision)

1Enter the weight value in ounces in the input field.
2View the converted mass instantly in grams, kilograms, and pounds.
3Toggle reverse conversion to switch seamlessly between grams and ounces.
4Select your preferred decimal rounding precision from 2 to 6 decimal places.

Formula & How It Works

NIST International Avoirdupois Definition

grams = ounces × 28.349523125

Based on the exact international pound defined as 0.45359237 kg divided by 16 ounces: 1 avoirdupois ounce equals exactly 28.349523125 grams.

Worked Examples

Standard 8 oz Measuring Cup of Liquid/Flour

Input: 8 oz

Explanation: 8 × 28.349523125 = 226.796185 grams.

Result: 226.796 grams

16 oz (1 Pound) Conversion

Input: 16 oz

Explanation: 16 × 28.349523125 = 453.59237 exact grams.

Result: 453.592 grams (0.4536 kg)

Small Culinary Spice Measurement (0.5 oz)

Input: 0.5 oz

Explanation: 0.5 × 28.349523125 = 14.17476 grams.

Result: 14.175 grams

Frequently Asked Questions

Is 1 oz exactly 28 grams?▼

No. 1 avoirdupois ounce is 28.349523125 grams. While 28g is sometimes used as a rough kitchen approximation, utilizing the full NIST factor prevents compounding scaling errors in professional baking.

What is the difference between an ounce and a fluid ounce?▼

An ounce (oz) is a measure of mass/weight. A fluid ounce (fl oz) is a measure of volume (approx. 29.57 mL in the US). Water has 1 fluid ounce weighing roughly 1.04 dry ounces.

How do I convert grams back to ounces?▼

Divide grams by 28.349523125, or multiply grams by 0.0352739619.

What is a troy ounce?▼

A troy ounce (31.1035g) is a historical unit used exclusively for weighing precious metals like gold and silver. It is approximately 9.7% heavier than a standard grocery avoirdupois ounce.

Why do professional bakers prefer grams over ounces?▼

Grams offer finer linear granularity without requiring fractions (like 1/4 or 1/8 oz), making scaling baker's percentages straightforward and repeatable.

Does this conversion execute client-side?▼

Yes, this converter runs 100% in your browser using Decimal.js precision.

Quick Reference & Conversion Table

Ounces (oz)	Exact Grams (g)	Rounded Grams	Kilograms (kg)	Pounds (lbs)
1 oz	28.34952 g	28.35 g	0.02835 kg	0.0625 lbs
2 oz	56.69905 g	56.70 g	0.05670 kg	0.125 lbs
4 oz	113.39809 g	113.40 g	0.11340 kg	0.25 lbs
8 oz	226.79619 g	226.80 g	0.22680 kg	0.50 lbs
16 oz	453.59237 g	453.59 g	0.45359 kg	1.00 lbs
32 oz	907.18474 g	907.18 g	0.90718 kg	2.00 lbs

⚠️ Common Pitfalls to Avoid

•Confusing weight ounces (avoirdupois oz) with fluid volume ounces (fluid oz), which measure two entirely different physical quantities.
•Confusing avoirdupois ounces (28.35g) with precious metal troy ounces (31.1035g).
•Using an overly rounded factor like 28g in industrial baking or chemical formulations.

💡 Practical Real-World Uses

•Scaling international baking recipes between US imperial weights and European gram scales.
•Calculating postal shipping weights for letters and international parcel dispatch.
•Tracking nutrition and dietary macros for meal planning and calorie counting.

Ounces vs Grams & Troy Ounces

Unit	Symbol	Grams Equivalent	Primary Application
Avoirdupois Ounce	oz	28.3495 g	General consumer goods, food, shipping
Gram	g	1.0000 g	SI metric standard, science, nutrition
Troy Ounce	oz t	31.1035 g	Precious bullion metals (gold, silver, platinum)
Fluid Ounce (US)	fl oz	29.5735 mL	Liquid volume (not mass)