Grams to Ounces Converter — Convert g to oz (Exact: oz = g ÷ 28.349523125)
Accurate grams (g) to ounces (oz) converter using the exact international definition 1 oz = 28.349523125 g. Ideal for cooking, nutrition labels, e-commerce shipping, jewelry findings (avoirdupois), and lab work.
Exact factor: 1 oz = 28.349523125 g ⇒ oz = g ÷ 28.349523125. Note: this is mass (oz), not fluid ounces (fl oz). For liquid volume, visit our volume metric converters.
About Grams to Ounces Conversion
The gram (g) is the metric workhorse used by food science, nutrition regulation, and international trade, while the ounce (oz) remains common in U.S. recipes, retail packs, and shipping labels. Converting grams to ounces makes your measurements portable across countries and standards. If you’re maintaining a global catalog or nutrition database, store your canonical mass in kilograms/grams for analytics and interchange, and compute ounces on the fly for region-friendly UI. Explore more at our free weight unit calculators.
Because the constant is exact—1 oz = 28.349523125 g—you can confidently publish transparent rounding policies (for example, 2–3 decimals in ounces for recipes; tighter precision in grams internally) and get reproducible results across exports, PDFs, and APIs.
Grams to Ounces Formula
Exact relationship
Use either expression:
oz = g ÷ 28.349523125
// mental math
oz ≈ g × 0.035274Example:
100 g ÷ 28.349523125 = 3.52739619496 ozRelated Weight Converters
What is a Gram (g)?
The gram is an SI unit of mass equal to 1/1000 of a kilogram. It’s the standard for nutrition labels, lab notebooks, R&D protocols, and international trade. For fine measurements—espresso dosing, baking, supplement formulation— grams (and even tenths of a gram) provide practical precision with consumer scales.
What is an Ounce (oz)?
The modern ounce used in everyday mass is the avoirdupois ounce. It is standardized so that one avoirdupois ounce equals exactly 28.349523125 grams. Do not confuse it with the fluid ounce (fl oz), which is volume, or the troy ounce (31.1034768 g) used for precious metals. This page converts the everyday mass ounce.
Step-by-Step: Converting g to oz
- Read the mass in grams (g) from your recipe, label, or scale.
- Divide by 28.349523125 to convert to ounces (oz).
- Round once at display time (e.g., 2–3 decimals in oz for home recipes).
Example walkthrough:
Input: 250 g
Compute: 250 ÷ 28.349523125 = 8.8184904874 oz
Output: 8.82 oz (UI, rounded); keep full precision internallyCommon Conversions
Everyday quick checks (g → oz)
| g | oz |
|---|---|
| 50 | 1.76370 |
| 100 | 3.52740 |
| 150 | 5.29109 |
| 250 | 8.81849 |
| 500 | 17.63698 |
| 1000 (1 kg) | 35.27396 |
Precision, Rounding & Significant Figures
Operational rounding
For cooking, 2–3 decimals in ounces is usually sufficient; for baking, coffee, and compound dosing, keep precise grams internally and round at presentation. Whatever you choose, round once at presentation time and store precise values to keep reports, emails, and exports consistent.
Consistent documentation
Standardize field names (e.g., mass_g, mass_oz, mass_kg), convert at one step in your pipeline, and publish constants/rounding in your methods note: “1 oz = 28.349523125 g; UI shows 2–3 decimals in oz.”
Where This Converter Is Used
- 🍰 Baking & recipe development: Convert metric-first recipes into ounces for U.S.-friendly presentation.
- 🥤 Nutrition & labeling: Regulatory tables and claims may be prepared in grams while packaging shows ounces.
- 📦 E-commerce shipping: International catalogs store grams; carriers in the U.S. may require ounces for small parcels.
- 🔬 Labs & R&D: Protocols record mass in grams; consumer summaries may include ounces.
- ☕ Coffee & beverage: Dose and yield tracked in grams; some guides reference ounces.
Quick Reference Table
Common ounce values (oz → g)
| oz | g |
|---|---|
| 1 | 28.34952 |
| 2 | 56.69905 |
| 4 | 113.39810 |
| 8 | 226.79618 |
| 12 | 340.19428 |
| 16 (1 lb) | 453.59233 |
Frequently Asked Questions
What is the exact formula to convert grams to ounces?
Use the internationally fixed constant for the avoirdupois ounce: 1 oz = 28.349523125 g. To convert grams to ounces, divide by 28.349523125: oz = g ÷ 28.349523125. This constant is exact and ensures your conversions match packaging, nutrition, and lab standards.
Is an ounce a unit of weight or volume? What about fluid ounces?
On this page, ounce (oz) is a unit of mass. A fluid ounce (fl oz) is a unit of volume used for liquids and belongs in the volume calculators (e.g., fl oz ↔ mL). If a recipe calls for fl oz, use a volume conversion—not mass—unless the ingredient density is specified.
What’s the difference between an avoirdupois ounce and a troy ounce?
This converter uses the modern avoirdupois ounce (common in everyday mass). A troy ounce—used for precious metals—is exactly 31.1034768 g and should not be mixed with food or parcel weights. If you need troy conversions, treat them as a separate system.
How precise should I be when converting g to oz for recipes?
Home cooking is usually fine with 2–3 decimal places in ounces; baking and confectionery often benefit from higher precision in grams first, then convert and round at display time. Internally, keep full precision and round once at presentation to avoid drift.
Can I estimate quickly without a calculator?
Yes. A handy shortcut is to divide grams by ~28.35 to get ounces, or multiply by 0.035274 (rounded). For documentation, nutrition facts, or labeling, use the exact constant 28.349523125 and state your rounding policy.
Why do shipping labels sometimes toggle between ounces and pounds?
Carriers in the U.S. often accept both lb and oz for small parcels. Converting g → oz helps align with U.S. labeling while your catalog or customs forms may prefer grams. For auditability, store mass in kilograms or grams and compute oz for labels.
Is it better to store grams or kilograms in my database?
Either works. Many teams store kilograms (SI base for mass) and compute grams/ounces for UI, while others store grams for integer arithmetic. Pick a canonical unit, document it, and convert at the edges. Consistency is more important than which unit you choose.
Do all kitchen scales measure in grams and ounces?
Most digital kitchen scales toggle between grams and ounces. For sticky ingredients or tare adjustments, grams provide finer control. For U.S. cookbooks, ounces are common—this converter bridges both worlds with exact, reproducible math.
What if my recipe lists volume units but I want ounces?
You’ll need ingredient density (mass per volume). Convert volume to mass using density, then if required convert to ounces. Without density, a direct fl oz → oz (mass) conversion isn’t valid because volume and mass are different physical quantities.
Tips for Working with Grams & Ounces
- Keep SI (kg/g) canonical for analytics and compliance; compute ounces for region-friendly UI.
- Document a single rounding policy (e.g., 2–3 decimals in oz) and reuse it across PDFs, exports, and emails.
- Don’t mix fluid ounces (volume) with mass ounces; if you must convert fl oz → g/oz, include density in your method.