Grams ↔ Ounces Converter
Fast, precise grams to ounces and ounces to grams, including troy ounces.
Inputs
Results
- 1 international avoirdupois ounce = 28.349523125 g.
- 1 troy ounce = 31.1034768 g.
- Scientific notation is used only for very small or very large values.
Use this Grams to Ounces Calculator to convert grams to ounces, ounces to grams, and related mass units such as milligrams, kilograms, and troy ounces. Enter a value in only one field, choose the correct unit, then calculate the equivalent weight or mass in grams and ounces.
Important Note: This Grams to Ounces Calculator converts mass values only. It converts between milligrams, grams, kilograms, avoirdupois ounces, and troy ounces using standard mass conversion factors.
Use oz for everyday avoirdupois ounces, such as food, groceries, product weights, packages, and shipping. Use ozt for troy ounces, which are commonly used for precious metals such as gold, silver, platinum, and palladium.
This calculator does not convert fluid ounces, cups, tablespoons, teaspoons, milliliters, or liters unless density is known. Fluid ounces measure volume, while grams and ounces in this calculator measure mass. For recipes, lab work, regulated materials, commercial specifications, or precious metals, confirm the correct ounce type and required rounding before relying on the result.
Reviewed by: AjaxCalculators Editorial Team
Last updated: April 28, 2026
Method source: Standard mass conversion factors, including 1 avoirdupois ounce = 28.349523125 g and 1 troy ounce = 31.1034768 g
Editorial standards: AjaxCalculators Editorial Policy
What This Grams to Ounces Calculator Converts
This calculator converts between grams and ounces, including both everyday ounces and troy ounces. It is useful when you need a quick weight or mass conversion for recipes, product weights, shipping, supplements, lab-style estimates, or precious-metal measurements.
The calculator can convert:
- Grams to ounces
- Ounces to grams
- Milligrams to ounces
- Kilograms to ounces
- Grams to troy ounces
- Troy ounces to grams
The live tool includes two main input areas: Grams and Ounces. The gram-side unit selector supports mg, g, and kg. The ounce-side unit selector supports oz and ozt.
What Grams to Ounces Means
Grams to ounces means converting a mass value from the metric system into an ounce value. A gram is a metric unit of mass, while an ounce is commonly used in U.S. customary and imperial-style weight measurements.
The everyday ounce used for food, packages, body weight fractions, and general items is usually the avoirdupois ounce.
1 avoirdupois ounce = 28.349523125 grams
So, to convert grams to ounces, divide grams by 28.349523125.
How the Grams to Ounces Calculator Works
1) Grams to Ounces Formula
To convert grams to avoirdupois ounces, divide by 28.349523125.
Ounces = grams ÷ 28.349523125
For example:
100 g ÷ 28.349523125 ≈ 3.5274 oz
2) Ounces to Grams Formula
To convert avoirdupois ounces to grams, multiply by 28.349523125.
Grams = ounces × 28.349523125
For example:
5 oz × 28.349523125 ≈ 141.7476 g
3) Troy Ounces to Grams Formula
A troy ounce is different from an everyday avoirdupois ounce. It is heavier and is commonly used in precious-metal contexts.
1 troy ounce = 31.1034768 grams
To convert troy ounces to grams:
Grams = troy ounces × 31.1034768
For example:
2 ozt × 31.1034768 = 62.2069536 g
4) Grams to Troy Ounces Formula
To convert grams to troy ounces, divide by 31.1034768.
Troy ounces = grams ÷ 31.1034768
For example:
100 g ÷ 31.1034768 ≈ 3.2151 ozt
Avoirdupois Ounce vs Troy Ounce
The calculator supports both oz and ozt, so it is important to choose the correct ounce type. A regular avoirdupois ounce and a troy ounce are not the same size.
| Unit | Meaning | Grams | Common Use |
|---|---|---|---|
| oz | Avoirdupois ounce | 28.349523125 g | Food, groceries, product weights, shipping, supplements, and everyday mass |
| ozt | Troy ounce | 31.1034768 g | Gold, silver, platinum, palladium, bullion, and precious-metal measurements |
A troy ounce is heavier than an avoirdupois ounce. Mixing them up can create a meaningful error, especially for precious metals, product specifications, or high-value materials.
Common Conversion Factors
| Conversion | Factor | Use Note |
|---|---|---|
| 1 mg to grams | 0.001 g | Divide milligrams by 1,000 |
| 1 g to milligrams | 1,000 mg | Multiply grams by 1,000 |
| 1 kg to grams | 1,000 g | Multiply kilograms by 1,000 |
| 1 avoirdupois ounce to grams | 28.349523125 g | Use for regular ounces, shown as oz |
| 1 troy ounce to grams | 31.1034768 g | Use for troy ounces, shown as ozt |
| 1 gram to avoirdupois ounces | 0.0352739619 oz | Use for everyday grams-to-ounces conversions |
| 1 gram to troy ounces | 0.0321507466 ozt | Use for grams-to-troy-ounces conversions |
Grams to Ounces Conversion Table
This table uses the regular avoirdupois ounce, where 1 oz = 28.349523125 g.
| Grams | Avoirdupois Ounces |
|---|---|
| 1 g | 0.0353 oz |
| 5 g | 0.1764 oz |
| 10 g | 0.3527 oz |
| 25 g | 0.8818 oz |
| 50 g | 1.7637 oz |
| 100 g | 3.5274 oz |
| 250 g | 8.8185 oz |
| 500 g | 17.6370 oz |
| 1,000 g | 35.2740 oz |
Ounces to Grams Conversion Table
This table uses regular avoirdupois ounces, not troy ounces.
| Avoirdupois Ounces | Grams |
|---|---|
| 0.5 oz | 14.1748 g |
| 1 oz | 28.3495 g |
| 2 oz | 56.6990 g |
| 4 oz | 113.3981 g |
| 8 oz | 226.7962 g |
| 12 oz | 340.1943 g |
| 16 oz | 453.5924 g |
| 32 oz | 907.1847 g |
Troy Ounces to Grams Conversion Table
This table uses troy ounces, where 1 ozt = 31.1034768 g. Use this table for precious-metal-style conversions, not everyday food or package ounces.
| Troy Ounces | Grams |
|---|---|
| 0.1 ozt | 3.1103 g |
| 0.5 ozt | 15.5517 g |
| 1 ozt | 31.1035 g |
| 2 ozt | 62.2070 g |
| 5 ozt | 155.5174 g |
| 10 ozt | 311.0348 g |
| 32.1507 ozt | 1,000 g |
Worked Example: Convert Grams to Ounces
Suppose you want to convert 500 grams to ounces.
Step 1: Use the grams-to-ounces formula
Ounces = grams ÷ 28.349523125
Step 2: Substitute the value
Ounces = 500 ÷ 28.349523125
Step 3: Calculate
Ounces ≈ 17.637 oz
So, 500 grams is approximately 17.637 avoirdupois ounces.
Worked Example: Convert Ounces to Grams
Suppose you want to convert 8 ounces to grams.
Step 1: Use the ounces-to-grams formula
Grams = ounces × 28.349523125
Step 2: Substitute the value
Grams = 8 × 28.349523125
Step 3: Calculate
Grams ≈ 226.796 g
So, 8 ounces is approximately 226.796 grams.
Worked Example: Convert Troy Ounces to Grams
Suppose you want to convert 3 troy ounces to grams.
Step 1: Use the troy-ounce formula
Grams = troy ounces × 31.1034768
Step 2: Substitute the value
Grams = 3 × 31.1034768
Step 3: Calculate
Grams ≈ 93.310 g
So, 3 troy ounces is approximately 93.310 grams.
How to Use This Grams to Ounces Calculator
- Enter a value in only one field: either the grams-side field or the ounces-side field.
- Select the correct unit on the grams side: mg, g, or kg.
- Select the correct unit on the ounces side: oz for everyday avoirdupois ounces or ozt for troy ounces.
- Click Calculate.
- Review the equivalent value in grams and ounces.
- Check the step-by-step derivation if you want to see the conversion math.
- Click Reset to clear the converter and start again.
How to Interpret the Result
| Result | What It Means | Important Caution |
|---|---|---|
| Equivalent in grams | The converted value expressed in grams. | Check whether your input was mg, g, kg, oz, or ozt before using the result. |
| Equivalent in ounces | The converted value expressed in the selected ounce type. | If the selected unit is oz, the result uses regular avoirdupois ounces. |
| Equivalent in troy ounces | The converted value expressed as ozt when troy ounce is selected. | Use ozt for precious metals and only when the context requires troy ounces. |
| Step-by-step derivation | The formula path used by the calculator. | Use it to confirm whether the conversion used 28.349523125 g/oz or 31.1034768 g/ozt. |
Grams, Milligrams, and Kilograms
The metric side of the calculator supports milligrams, grams, and kilograms. These are all metric mass units.
| Metric Unit | Relationship to Grams | Example Use |
|---|---|---|
| mg | 1 mg = 0.001 g | Small masses, labels, supplements, and lab-style values |
| g | 1 g = 1 g | Food, recipes, product weight, and everyday measurements |
| kg | 1 kg = 1,000 g | Larger masses, bulk items, shipping, and metric body weight |
Grams to Ounces for Cooking
Many recipes use grams for precision, while some use ounces. A grams-to-ounces calculator can help convert between these systems quickly.
For cooking and baking, grams are often more precise because a kitchen scale can measure ingredients directly by mass. Ounces may be useful when following recipes or package labels that use U.S. customary measurements.
Remember that this converter handles weight or mass ounces, not fluid ounces. If a recipe gives fluid ounces, that is a volume measurement and should not be converted with this tool unless you also know the ingredient density.
Ounces vs Fluid Ounces
An ounce can refer to mass, while a fluid ounce refers to volume. They are not the same measurement.
| Term | What It Measures | Example | Use This Calculator? |
|---|---|---|---|
| oz | Mass or weight | 8 oz of flour by weight | Yes, when oz means avoirdupois mass |
| ozt | Troy mass | 1 ozt of gold | Yes, when troy ounces are required |
| fl oz | Volume | 8 fl oz of water by volume | No, unless density is known and a separate mass-volume conversion is used |
This calculator is for mass conversion. Do not use it for fluid ounces, cups, tablespoons, teaspoons, milliliters, or liters unless you also know the ingredient or liquid density.
When to Use Troy Ounces
Use troy ounces when the value is specifically given in ozt or when the context clearly involves precious metals such as gold, silver, platinum, or palladium.
| Context | Recommended Unit | Reason |
|---|---|---|
| Food, groceries, supplements, product labels, shipping, and everyday weights | oz | These usually use regular avoirdupois ounces. |
| Gold, silver, platinum, palladium, bullion, and precious-metal listings | ozt | Precious metals commonly use troy ounces. |
| Unclear listing that says only “oz” | Check context first | In bullion contexts, “oz” often means troy ounce; in everyday contexts, it usually means avoirdupois ounce. |
Common Mistakes to Avoid
| Mistake | Why It Causes Problems |
|---|---|
| Confusing regular ounces with troy ounces | 1 oz and 1 ozt use different gram values, so the result will be wrong if the wrong ounce type is selected. |
| Confusing ounces with fluid ounces | Ounces in this calculator are mass units, while fluid ounces are volume units. |
| Using 28.349523125 g for troy ounces | Troy ounces use 31.1034768 g per ozt. |
| Using 31.1034768 g for everyday ounces | Everyday avoirdupois ounces use 28.349523125 g per oz. |
| Entering values in both fields at the same time | The calculator is designed for one input value at a time. |
| Converting cups or milliliters to grams without density | Volume-to-mass conversion requires ingredient or liquid density. |
| Rounding too aggressively for precious metals or lab values | Small rounding differences can matter when values are high, regulated, or specification-based. |
| Assuming recipe ounces always mean fluid ounces | Recipes may use ounces by weight or fluid ounces by volume, so context matters. |
Formula Summary
| What You Want to Convert | Formula | Use Note |
|---|---|---|
| Grams to avoirdupois ounces | oz = g ÷ 28.349523125 | Use for regular ounces. |
| Avoirdupois ounces to grams | g = oz × 28.349523125 | Use for food, packages, shipping, and everyday mass. |
| Grams to troy ounces | ozt = g ÷ 31.1034768 | Use for precious-metal contexts. |
| Troy ounces to grams | g = ozt × 31.1034768 | Use only when the source value is a troy ounce. |
| Milligrams to grams | g = mg ÷ 1,000 | Use before converting small metric masses to ounces. |
| Kilograms to grams | g = kg × 1,000 | Use before converting larger metric masses to ounces. |
When You May Need a Different Calculator
This converter is best for mass conversions between grams, milligrams, kilograms, regular ounces, and troy ounces. You may need another calculator when the problem involves volume, density, price, or nutrition.
| Need | Better Tool or Method |
|---|---|
| Convert cups to grams | Use a grams-to-cups converter with ingredient density. |
| Convert milliliters to grams | Use an mL-to-grams converter with liquid density. |
| Convert grams to calories | Use a grams-to-calories calculator with macronutrient type. |
| Compare price per gram or price per ounce | Use a unit price or weight price comparison calculator. |
| Convert troy ounces for live precious-metal pricing | Use a precious-metal calculator with current market price data. |
| Convert fluid ounces to grams | Use density, because fluid ounces measure volume, not mass. |
Practical Uses
This Grams to Ounces Calculator can be useful for:
- converting recipe ingredients from grams to ounces
- converting package weights from ounces to grams
- checking nutrition or supplement amounts
- converting product weights for shipping or listings
- converting precious-metal weights between grams and troy ounces
- checking kilogram or milligram values in ounce format
- comparing international product labels
- learning the difference between oz and ozt
When Exact Precision Matters
For casual cooking, rounding to two or three decimals may be enough. For high-value materials, technical specifications, lab-style work, or precious metals, use more decimal places and confirm the correct ounce type.
Small rounding differences can become important when the material is expensive, regulated, or measured in large quantities.
Frequently Asked Questions
How many grams are in one ounce?
One regular avoirdupois ounce equals 28.349523125 grams.
How many grams are in one troy ounce?
One troy ounce equals 31.1034768 grams.
Are oz and ozt the same?
No. Oz usually means regular avoirdupois ounce, while ozt means troy ounce. A troy ounce is heavier than a regular ounce.
When should I use troy ounces?
Use troy ounces for precious metals such as gold, silver, platinum, palladium, and bullion-related measurements.
Can this calculator convert fluid ounces to grams?
No. Fluid ounces measure volume, while grams measure mass. To convert fluid ounces to grams, you need the density of the liquid or ingredient.
Is 100 grams equal to 3.5274 ounces?
Yes, 100 grams is approximately 3.5274 regular avoirdupois ounces.
Is 1,000 grams equal to 1 kilogram?
Yes. One kilogram equals 1,000 grams.
Why do precious metals use troy ounces?
Precious metals are commonly traded and quoted using troy ounces. This is a different mass unit from the regular ounce used for food, packaging, and everyday weights.
References
- NIST Guide to the SI — Appendix B: Conversion Factors
- NIST Guide to the SI — Appendix B.8: Conversion Factors
- NIST — Approximate Conversions from U.S. Customary Measures to Metric
- BIPM — SI Base Units
- BIPM — SI Prefixes
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Grams to Ounces Calculator Disclaimer
This Grams to Ounces Calculator converts mass values only. It converts between milligrams, grams, kilograms, regular avoirdupois ounces, and troy ounces using standard conversion factors.
It does not convert fluid ounces, cups, tablespoons, teaspoons, milliliters, or liters unless density is known. Do not confuse mass ounces with fluid ounces, and do not confuse regular ounces with troy ounces. Use oz for everyday avoirdupois ounces and ozt for troy ounces.
For cooking, casual estimates, and everyday product weights, rounded results are usually acceptable. For precious metals, regulated materials, lab work, nutrition labeling, shipping specifications, commercial documents, or high-value measurements, verify the correct unit type, source standard, and required rounding before relying on the result.