Percentage calculations explained
Percentage change measures how much a value has grown or shrunk from its original. Percentage of a number finds a portion of a total. Percentage difference compares two values symmetrically without a defined original.
% Change = (New − Old) ÷ Old × 100
% Of = (Percentage ÷ 100) × Number
% Difference = |A − B| ÷ ((A + B) ÷ 2) × 100
How do you calculate percentage change?
Percentage change = (New − Old) ÷ Old × 100. Positive = increase, negative = decrease.
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. E.g., 20% of 150 = 30.