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Divide the percentage by 100 and multiply it by the number. For example, to find 20% of 150, calculate (20 ÷ 100) × 150 = 30.

Divide the part by the whole and multiply by 100. For example, to find what percentage 30 is of 150, calculate (30 ÷ 150) × 100 = 20%.

Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result means an increase; a negative result means a decrease.

Percentage difference compares two values without treating either as the "original" — it's the absolute difference divided by their average, multiplied by 100.

If a value increased by X% to become R, the original is R ÷ (1 + X/100). If it decreased by X%, the original is R ÷ (1 − X/100).

Percentage change is a relative change (50 to 60 is +20%). A percentage point is the raw difference between two percentages (5% to 7% is a 2 point rise, a 40% relative increase).

For 10%, shift the decimal one place left. For 1%, shift it two places left. For 50%, divide by 2. For 25%, divide by 4. Combine these for other values, like adding 10% + 5% to get 15%.

Use the "Add Percentage" mode: multiply the amount by the tax rate ÷ 100, then add it to the original amount. 18% GST on ₹1,000 adds ₹180, for a total of ₹1,180.