Divide the part by the whole
Multiply the result by 100
Use the formula: Percentage = (Part ÷ Whole) × 100
Example: (25 ÷ 200) × 100 = 12.5%
To find what percent A is of B, use: (A ÷ B) × 100
To find the percentage increase or decrease, use: ((New − Old) ÷ Old) × 100