ounces to grams Calculator

Calculator Overview

Formula: grams = ounces × 28.3495

Quick conversions:

• 1 oz = 28.35 g (One ounce)
• 8 oz = 226.8 g (Half pound)
• 16 oz = 453.6 g (One pound)
• 4 oz = 113.4 g (Quarter pound)

Table of Contents

• What is an Ounce?
• What is a Gram?
• Conversion Formula
• Conversion Table
• Real-World Applications
• Research & Science
• Common Use Cases
• Tips for Accurate Conversion
• Frequently Asked Questions

What is an Ounce?

Definition

An ounce (oz) is a unit of mass in the imperial and US customary systems. One ounce equals exactly 28.3495 grams or 1/16 of a pound.

Key Points

• Symbol: oz
• System: Imperial/US Customary
• Equals: 28.3495 grams, 1/16 pound
• Used By: United States primarily

American Standard

Americans use ounces for:

• Recipe measurements
• Food packaging
• Nutrition labels
• Postal rates
• Precious metals
• Baby weight tracking

Important Note

This calculator converts weight ounces (avoirdupois), not fluid ounces (volume).

What is a Gram?

Definition

A gram (g) is a unit of mass in the metric system, equal to one-thousandth of a kilogram. It's the global standard for precise measurements.

Key Points

• Symbol: g
• System: Metric (SI)
• Equals: 1/1000 kilogram, 0.035274 ounces
• Used By: Global standard for precision

Why Grams in Professional Cooking

• More precise than ounces
• International standard
• Consistent results
• Easy recipe scaling
• Professional baker preference
• Scientific accuracy

Ounces to Grams Conversion Formula

The Standard Formula

grams = ounces × 28.3495

This provides accurate conversion for all weight measurements.

Formula Breakdown

1. Step 1: Take weight in ounces
2. Step 2: Multiply by 28.3495
3. Result: Weight in grams

Why This Formula Works

By the 1959 International Agreement:

• 1 ounce = exactly 28.349523125 grams
• Practical: 28.3495 provides accuracy within 0.001 grams per ounce.

Precision Levels

For different needs:

• Quick estimate: 28 g per ounce (~1.2% error)
• General use: 28.35 g per ounce (very close)
• Precise work: 28.3495 g per ounce (recommended)
• Scientific: 28.349523125 g per ounce (exact)

Quick Approximation

For rough cooking estimates: grams ≈ ounces × 28

Example: 10 oz × 28 = 280 grams

Actual: 10 × 28.3495 = 283.495 grams

Close enough for most recipes!

Reverse Calculation

To convert grams back to ounces: ounces = grams ÷ 28.3495

Example: 100 grams = 100 ÷ 28.3495 = 3.527 ounces

How to Calculate Ounces to Grams

Method 1: Standard Multiplication

Example: Convert 12 ounces to grams

1. Step 1: Multiply by 28.3495
2. 12 × 28.3495 = 340.194
3. Answer: 12 ounces = 340.2 grams

Method 2: Quick Approximation (×28)

Example: Rough estimate of 10 ounces

1. Step 1: Multiply by 28
2. 10 × 28 = 280 grams
3. Actual: 10 × 28.3495 = 283.495 grams
4. Accuracy: Within 3.5 grams (good for cooking)

Method 3: Using 30 (Simpler Mental Math)

For very quick estimates:

Example: 8 ounces

8 × 30 = 240 grams

Actual: 8 × 28.3495 = 226.8 grams

About 6% high (rough planning only)

Method 4: Benchmark Method

Memorize common conversions:

Key benchmarks:

• 1 oz = 28 g
• 4 oz = 113 g (quarter pound)
• 8 oz = 227 g (half pound)
• 12 oz = 340 g
• 16 oz = 454 g (one pound)

Example: Estimate 6 ounces

• Between 4 (113g) and 8 (227g)
• Rough: 170 grams
• Actual: 6 × 28.3495 = 170.1 grams ✓

Comprehensive Conversion Table

Common Ounce Amounts

Baking Measurements

Recipe Portions

Coffee & Tea

Nutrition Servings

Supplement Dosing

Real-World Applications

1. Professional Baking

Professional bakers work exclusively in grams.

Flour needed: 16 ounces

Convert to grams:

• 16 × 28.3495 = 453.59 grams
• Use: 454 grams flour

Why grams in baking:

• More precise than volume
• Consistent results every time
• Professional standard worldwide
• Easy to scale recipes
• Eliminates cup measurement errors

Baker's percentages: All ingredients calculated from flour weight:

• Flour: 454g (100%)
• Water: 272g (60%)
• Salt: 9g (2%)
• Yeast: 5g (1%)
• Perfect results every time!

2. Recipe Conversion

Converting US cookbooks for international use.

Butter: 4 ounces (1 stick)

Convert:

• 4 × 28.3495 = 113.4 grams
• Use: 113 grams butter

Complete conversion:

• Flour: 8 oz = 227g
• Sugar: 6 oz = 170g
• Butter: 4 oz = 113g
• Eggs: 3 oz = 85g (about 1.5 large)
• Now anyone worldwide can make the recipe!

3. Nutrition Tracking

Many apps use gram measurements.

Chicken breast: 6 ounces

Convert for tracking:

• 6 × 28.3495 = 170.1 grams
• Log: 170 grams chicken

Protein calculation:

• Chicken: 31g protein per 100g
• Your portion: 170g
• Protein: (170 ÷ 100) × 31 = 52.7g protein
• Accurate macro tracking!

4. Coffee Brewing

Coffee professionals use grams.

Coffee needed: 0.7 ounces

Convert:

• 0.7 × 28.3495 = 19.84 grams
• Measure: 20 grams coffee

Water ratio (1:15):

• Coffee: 20g
• Water: 20 × 15 = 300g
• Perfect brew every time

Buying beans: Bag: 12 ounces

Convert: 12 × 28.3495 = 340.2 grams

Servings: 340 ÷ 20 = 17 cups

5. Supplement Dosing

Precise dosing in grams.

Scoop size: 1.06 ounces

Convert:

• 1.06 × 28.3495 = 30.05 grams
• Serving: 30 grams

Container calculation:

• Container: 32 oz = 907 grams
• Serving: 30 grams
• Servings: 907 ÷ 30 = 30.2 servings

6. Baby Food Portions

Pediatric guidelines use grams.

Serving: 1 ounce puree

Convert:

• 1 × 28.3495 = 28.35 grams
• Serve: 28 grams (rounded to 30g)

Daily progression:

• Week 1: 1 oz = 28g
• Week 2: 2 oz = 57g
• Week 3: 3 oz = 85g
• Tracking growth precisely

7. Meal Prep

Consistent portions in grams.

7 portions of 5 ounces each

Per portion:

• 5 × 28.3495 = 141.7 grams
• Each portion: 142 grams

Total needed:

• 7 × 142g = 994 grams
• Buy: 1 kilogram chicken
• Divide precisely with scale!

8. Cheese & Deli Orders

Some scales show only grams.

Want: 8 ounces cheese

Convert for order:

• 8 × 28.3495 = 226.8 grams
• Request: 227 grams cheese

Understanding packages: Imported cheese: 200g package

Convert to oz: 200 ÷ 28.3495 = 7.05 oz

Just under half pound

Research & Scientific Background

The 1959 International Agreement

• 1 ounce = exactly 28.349523125 grams
• Six English-speaking nations agreed
• Fixed conversion forever
• Enabled global commerce

• Slight variations existed
• International trade issues
• Scientific inconsistencies

• Single avoirdupois ounce
• Exact gram conversion
• Simplified global trade

Research Citation: National Bureau of Standards (1959). "Refinement of Values for the Yard and the Pound."

Professional Baking Standards

• Le Cordon Bleu: Only grams
• Culinary Institute of America: Grams preferred
• International certifications: Grams required

• Michelin restaurants: Exclusively grams
• Production bakeries: Grams for consistency
• Recipe development: Grams for accuracy

• 1 cup flour: 120-140 grams (varies!)
• 1 oz flour: Always 28.35 grams
• Weight eliminates ambiguity

Research Citation: Culinary Institute of America (2023). "Professional Baking Standards."

Nutrition Science

• Must list in grams
• Ounces shown as reference
• International comparison enabled
• Standardized portions

"Serving Size: 28g (1 oz)"

• Primary unit: Grams
• Secondary: Ounces
• Clear, consistent

Research Citation: FDA (2023). "Food Labeling Guide - Serving Sizes."

Common Use Cases with Detailed Examples

Use Case 1: Baking Bread

Scenario: Recipe calls for 16 oz flour. Need grams for precision.

Convert:

• 16 × 28.3495 = 453.59 grams
• Use: 454 grams flour

Use Case 2: Protein Shake

Scenario: Scoop is 1.06 oz. What in grams?

Convert:

• 1.06 × 28.3495 = 30.05 grams
• Scoop: 30 grams protein powder

Use Case 3: Coffee Brewing

Scenario: Need 0.6 oz coffee. How many grams?

Convert:

• 0.6 × 28.3495 = 17.01 grams
• Measure: 17 grams coffee

Use Case 4: Meal Prep

Scenario: Each portion is 5 oz chicken. Grams for scale?

Convert:

• 5 × 28.3495 = 141.75 grams
• Portion: 142 grams per meal

Use Case 5: Baby Food

Scenario: Pediatrician says 2 oz solids. Grams?

Convert:

• 2 × 28.3495 = 56.70 grams
• Feed: 57 grams

Use Case 6: Deli Order

Scenario: Want 12 oz ham. Scale shows grams.

Convert:

• 12 × 28.3495 = 340.19 grams
• Request: 340 grams ham

Use Case 7: Baking Chocolate

Scenario: Recipe needs 4 oz chocolate. Grams?

Convert:

• 4 × 28.3495 = 113.40 grams
• Use: 113 grams chocolate

Use Case 8: Supplement Serving

Scenario: Creatine dose is 0.18 oz. Grams?

Convert:

• 0.18 × 28.3495 = 5.10 grams
• Dose: 5 grams creatine

Tips for Accurate Conversion

For Precision

• Use exact multiplier: 28.3495 (not 28)
• Digital scale essential: For baking
• Round appropriately: To nearest gram usually fine
• Verify: Divide result by 28.3495 to check

Example:

• 8 oz × 28.3495 = 226.796 grams
• Check: 226.796 ÷ 28.3495 = 8 oz ✓

Quick Mental Math

Multiply by 28:

• 10 oz × 28 = 280 grams
• Actual: 283.5 grams
• Close enough for most cooking!

Multiply by 30 (rougher):

• 8 oz × 30 = 240 grams
• Actual: 226.8 grams
• Quick ballpark estimate

Memorize Benchmarks

Key conversions:

• 1 oz = 28 g
• 4 oz = 113 g (quarter pound)
• 8 oz = 227 g (half pound)
• 16 oz = 454 g (one pound)

Common Mistakes

• Using 30 instead of 28 - 6% error
• Confusing weight oz with fluid oz
• Wrong direction - multiply, don't divide
• Forgetting decimals - 1.5 oz ≠ 15 oz
• Using volume measures for weight

Frequently Asked Questions

How many grams in an ounce?

One ounce equals 28.3495 grams (approximately 28 grams).

How do I convert ounces to grams?

Multiply ounces by 28.3495.

Formula: g = oz × 28.3495

Example: 8 oz × 28.3495 = 226.8 g

What is 1 oz in grams?

1 oz = 28.35 grams (rounded to 28g is close)

How many grams is 8 oz?

8 oz = 226.796 grams (approximately 227g or half pound)

What is 16 oz in grams?

16 oz = 453.592 grams (one pound)

Can I use 28 for quick conversion?

Yes, for cooking estimates (~1.2% error). Use 28.35 for accuracy.

What is 4 oz in grams?

4 oz = 113.398 grams (approximately 113g or quarter pound)

How many grams is 12 oz?

12 oz = 340.194 grams (approximately 340g)

Is 30 grams 1 ounce?

Close! 28.35g = 1 oz. 30g = 1.06 oz (slightly more)

What is 2 oz in grams?

2 oz = 56.699 grams (approximately 57g)

How many grams in half an ounce?

0.5 oz = 14.175 grams (approximately 14g)

What is 6 oz in grams?

6 oz = 170.097 grams (approximately 170g)

Can I use 30 grams per ounce?

Only for very rough estimates (~6% error). Use 28.35 for cooking.

What is 10 oz in grams?

10 oz = 283.495 grams (approximately 283g)

How many grams is 3 oz?

3 oz = 85.049 grams (approximately 85g)

Related Conversions

Reverse Conversion

• Grams to Ounces - Convert g to oz
• Formula: oz = g ÷ 28.3495

Related Weight Conversions

• Ounces to Pounds - Imperial conversion
• Ounces to Kilograms - oz to kg
• Grams to Pounds - Metric to imperial
• Pounds to Grams - Reverse imperial to metric

All Calculators

• View All Calculators - 100+ conversion tools

Quick Reference Guide

Formula Summary

• oz to g: g = oz × 28.3495
• g to oz: oz = g ÷ 28.3495

Key Conversions

• 1 oz = 28 g
• 4 oz = 113 g (quarter pound)
• 8 oz = 227 g (half pound)
• 16 oz = 454 g (one pound)

Quick Estimate

• Times 28 (cooking)
• Times 28.35 (precise)
• Times 30 (rough only)

Remember

• ✓ Multiply by 28.3495 (or 28)
• ✓ Weight oz, not fluid oz
• ✓ Essential for baking
• ✓ Professional standard

Calculator Features

• ✓ Instant conversion
• ✓ Accurate formula (28.3495)
• ✓ Perfect for baking precision
• ✓ Free forever