Online Percentage Calculator

To calculate a percentage, you need two values: the part and the whole. The formula is: (part / whole) × 100 = percentage. For example, if you have 20 apples out of 100 total fruits, the percentage of apples is (20 / 100) × 100 = 20%.

To calculate percentage change, use the formula: ((New Value – Old Value) / Old Value) × 100. If the result is positive, it’s an increase; if negative, it’s a decrease. For example, if a price increased from $50 to $60, the percentage change is ((60 – 50) / 50) × 100 = 20% increase.

Percentage change measures how much a value has increased or decreased relative to its original value, while percentage difference measures the difference between two values relative to their average. Percentage change is directional (increase or decrease), while percentage difference is always non-directional.

To calculate X% of Y, use the formula: (X / 100) × Y. For example, to calculate 25% of 200, you would calculate (25 / 100) × 200 = 50. This means 25% of 200 is 50.

To find what percentage one number is of another, use the formula: (Number / Total) × 100. For example, to find what percentage 50 is of 200, you would calculate (50 / 200) × 100 = 25%. This means 50 is 25% of 200.