Ounce to Gram Calculator

Convert ounces to grams instantly with precision. Essential for jewelry making, precious metals trading, cooking, and scientific measurements.

Ounces to Grams
Grams to Ounces
oz
Enter the ounce value to convert to grams
Select the type of ounce you want to convert
0.1 oz
0.5 oz
1 oz
3.5 oz
5 oz
8 oz (½ lb)
12 oz
16 oz (1 lb)
Conversion Result
1 avoirdupois ounce = 28.35 grams
Input Value
1 oz
Avoirdupois Ounce oz
Converted Value
28.35 g
Grams (g)
Equivalent Weight in Different Units
28.35
Grams (g)
1.00
Avoirdupois oz
0.91
Troy oz
0.96
Fluid oz
Precision Settings

Understanding Ounce to Gram Conversions

Converting ounces to grams is essential in many professional fields including jewelry making, precious metals trading, cooking, pharmaceuticals, and scientific research. Accuracy in these conversions can mean significant financial implications, especially when dealing with precious metals.

Professional Conversion Formulas:

1 Avoirdupois Ounce (oz) = 28.349523125 Grams (g)

1 Troy Ounce (oz t) = 31.1034768 Grams (g)

1 Fluid Ounce (water) ≈ 29.5735295625 Grams (g) *

* Note: Fluid ounces measure volume. This conversion is for water at 4°C (maximum density). For other liquids, density must be considered.

Why Precision Matters in Ounce Conversions

1

Precious Metals Trading: Gold, silver, and platinum are traded internationally in troy ounces. A small error in conversion (avoirdupois vs troy) can result in significant financial loss. One troy ounce of gold is worth approximately $2,000, making precise conversion critical.

2

Jewelry Manufacturing: Jewelers work with precise measurements. Converting ounce measurements of gold or silver to grams ensures accurate material costing and pricing. Even a 0.1g error in a gold piece can mean $5-10 in material cost.

3

Pharmaceutical Formulations: Medication dosages often require precise conversions between ounce and gram measurements, especially when compounding medications or following international formulas.

Ounce to Gram Conversion Table

Ounces Avoirdupois to Grams Troy to Grams Common Usage
0.1 oz 2.835 g 3.110 g Small jewelry piece, spice measurement
0.5 oz 14.175 g 15.552 g Ring, earrings, small food portion
1 oz 28.350 g 31.103 g Standard ounce, small gold bar
3.5 oz 99.223 g 108.862 g Typical wristwatch weight
5 oz 141.748 g 155.517 g Small smartphone, recipe measurement
8 oz (½ lb) 226.796 g 248.828 g Standard cup measurement, small steak
12 oz 340.194 g 373.242 g Can of soda, medium jewelry chain
16 oz (1 lb) 453.592 g 497.656 g Pound weight, larger gold bar
32 oz (2 lb) 907.185 g 995.312 g Large recipe batch, kilo approximation

Precious Metals Conversion Reference

Metal Type Troy Ounces Grams Approximate Value*
Gold (24K) 1 oz t 31.103 g $2,000 - $2,500
Silver (999) 1 oz t 31.103 g $25 - $30
Platinum 1 oz t 31.103 g $900 - $1,100
Palladium 1 oz t 31.103 g $1,200 - $1,500
Gold (1 gram) 0.03215 oz t 1.000 g $65 - $80
Silver (1 gram) 0.03215 oz t 1.000 g $0.80 - $1.00

* Values are approximate and fluctuate with market prices.

Professional Calculator Features:

  • Precision conversions up to 6 decimal places
  • Support for all ounce types: avoirdupois, troy, and fluid
  • Real-time market-based precious metal calculations
  • Historical conversion tracking and comparison
  • Mobile-optimized for field use by jewelers and traders

Frequently Asked Questions

One troy ounce of gold equals exactly 31.1034768 grams. This is different from an avoirdupois ounce (used for everyday items), which is only 28.349523125 grams. When buying or selling gold, always confirm the ounce type - troy ounces are standard for precious metals worldwide.

Troy ounces (31.103g) are heavier than avoirdupois ounces (28.3495g) because they come from different measurement systems with different historical definitions. The troy system was developed for precious metals in medieval Europe, while the avoirdupois system evolved for general commerce. The difference (about 9.7%) is significant when dealing with valuable materials.

Fluid ounces measure volume, not weight, so conversion to grams depends entirely on the liquid's density. For water at 4°C (maximum density), 1 fluid ounce ≈ 29.5735 grams. For other liquids: milk ≈ 30.6g/fl oz, olive oil ≈ 26.5g/fl oz, honey ≈ 42g/fl oz. For precise conversions, you need to know the specific gravity or density of the liquid.

The most common error is confusing avoirdupois ounces with troy ounces, especially when dealing with precious metals. Using the wrong conversion factor (28.35 instead of 31.10) results in approximately 9.7% error. For 10 troy ounces of gold, this mistake would mean calculating 283.5g instead of the correct 311.0g - a significant error when gold is valued at $65-80 per gram.

One avoirdupois pound (16 avoirdupois ounces) equals exactly 453.59237 grams. One troy pound (12 troy ounces) equals 373.2417216 grams. Remember that troy pounds are rarely used in modern practice - precious metals are almost always quoted in troy ounces, not troy pounds.