Ounces to Grams

Enter value in oz:

Ounces (oz) to Grams (g) Conversion

Converting ounces to grams is crucial in cooking, baking, postal services, laboratory work, and many international applications. The ounce (avoirdupois) is an imperial‐derived unit commonly used in the United States and UK for small‐scale weights, while the gram is the SI unit of mass. Accurate oz ↔ g conversion ensures recipe fidelity, correct dosing, and reliable shipping calculations.

Exact Conversion Factor

By international agreement:
1 ounce (oz) = 28.349523125 grams (g)

Derivation

The avoirdupois ounce is defined exactly as 1⁄16 of a pound, and with 1 lb = 453.59237 g, one ounce becomes:
453.59237 g ÷ 16 = 28.349523125 g.

Conversion Formulas

Mass (g) = Mass (oz) × 28.349523125
Mass (oz) = Mass (g) × 0.03527396195

Precision

Retain at least six significant digits in intermediate steps; for everyday use, rounding to three decimal places (e.g., 28.350 g) is sufficient.

Tip:

Centralize the constant OZ_TO_G = 28.349523125 in your code or spreadsheets to avoid magic numbers.

Step-by-Step Conversion Procedure

1. Identify Your Input

Confirm your value is in ounces (“oz”).

2. Apply the Factor

Multiply ounces by 28.349523125 to get grams.

3. Round & Label

Round to desired precision (e.g., nearest 0.1 g) and append “g”.

Illustrative Examples

Example 1: Simple Conversion

Convert 5 oz to grams:
5 × 28.349523125 = 141.747615625 g → rounded to 141.748 g.

Example 2: Small Quantity

Convert 0.5 oz to grams:
0.5 × 28.349523125 = 14.1747615625 g → 14.175 g.

Example 3: Larger Amount

Convert 16 oz (1 lb) to grams:
16 × 28.349523125 = 453.59237 g → 453.592 g.

Tip:

When scaling recipes, convert all ingredient weights from ounces to grams before adjusting quantities.

Quick-Reference Conversion Table

Ounces (oz)Grams (g)
0.514.175
128.350
256.699
4113.398
8226.797
16453.592

Implementing in Code

JavaScript Snippet

const OZ_TO_G = 28.349523125;
function ouncesToGrams(oz) {
  return oz * OZ_TO_G;
}
console.log(ouncesToGrams(5).toFixed(3)); // "141.748"

Python Snippet

OZ_TO_G = 28.349523125

def ounces_to_grams(oz):
    return oz * OZ_TO_G

print(f"{ounces_to_grams(0.5):.3f}")  # 14.175
Spreadsheet Formula

Assuming ounces in cell A2:
=A2*28.349523125 → grams.

Tip:

Use named ranges (e.g., MassOz) for clarity in complex workbooks.

Error Analysis & Best Practices

Rounding Strategy

Choose between fixed decimal places (e.g., three for cooking) or significant figures (for scientific use) and document your choice.

Uncertainty Propagation

For scale uncertainty ±δ oz, gram uncertainty is ±(δ × 28.349523125) g; include in lab reports when precision matters.

Centralized Logic

Encapsulate conversion constants and functions in shared modules or microservices to avoid discrepancies.

Note:

Validate inputs (non‐negative, numeric) and handle errors gracefully in UIs and APIs.

Final analysis

Remember: 1 ounce = 28.349523125 grams. By applying this precise factor, you can accurately convert any ounce measurement to grams for cooking, shipping, laboratory, or industrial applications—ensuring consistency and reliability across all your workflows.

See Also