Pounds to Grams

Enter value in lb:

Pounds (lb) to Grams (g) Conversion

Converting pounds to grams is a common requirement in cooking, shipping, scientific measurements, and engineering. A pound is an Imperial and US customary unit of mass, while the gram is the SI base unit. Accurate lb ↔ g conversion ensures recipe fidelity, correct dosing, and reliable logistics calculations.

Exact Conversion Factor

By international agreement:
1 lb = 453.59237 g

Derivation

Since 1 lb = 0.45359237 kg and 1 kg = 1000 g, multiplying yields:
0.45359237 × 1000 = 453.59237 g.

Conversion Formula

Mass (g) = Mass (lb) × 453.59237
Mass (lb) = Mass (g) ÷ 453.59237

Precision Guidelines

Retain at least six significant digits in intermediate calculations; for everyday use, rounding to one decimal (e.g., 453.6 g) is sufficient.

Tip:

Define a constant in your code or spreadsheet: LB_TO_G = 453.59237 to avoid “magic numbers.”

Step-by-Step Conversion Procedure

1. Identify Your Input

Confirm the weight value in pounds from your scale or data source.

2. Apply the Factor

Multiply pounds by 453.59237 to obtain grams.

3. Round & Label

Round to the required precision and append “g” to the result.

Illustrative Examples

Example 1: Simple Conversion

Convert 2 lb to grams:
2 × 453.59237 = 907.18474 g → 907.185 g.

Example 2: Fractional Value

Convert 0.5 lb to grams:
0.5 × 453.59237 = 226.796185 g → 226.796 g.

Example 3: Larger Weight

Convert 10 lb to grams:
10 × 453.59237 = 4 535.9237 g → 4 535.924 g.

Tip:

For recipes, convert all ingredient weights before scaling batch sizes to maintain ratios.

Quick-Reference Table

Pounds (lb)Grams (g)
0.25113.398
0.5226.796
1453.592
2907.185
52 267.962
104 535.924

Implementing in Code

JavaScript Snippet

const LB_TO_G = 453.59237;
function poundsToGrams(lb) {
  return lb * LB_TO_G;
}
console.log(poundsToGrams(2)); // 907.18474

Python Snippet

LB_TO_G = 453.59237

def pounds_to_grams(lb):
    return lb * LB_TO_G

print(pounds_to_grams(0.5))  # 226.796185
Spreadsheet Formula

Assuming pounds in A2:
=A2*453.59237 → grams.

Tip:

Use named ranges (WeightLb, WeightG) for clarity in complex sheets.

See Also