Four calculators in one: percent of, percent between two numbers, percentage change, and add/subtract percent.
Real-World Examples
- Tip calculator: 20% of a $67 bill → use Tab 1.
- Test score: 42 correct out of 50 → use Tab 2 (84%).
- Stock gain: Bought at $80, now $100 → use Tab 3 (+25%).
- Sales tax: $29.99 item + 8.25% tax → use Tab 4 ($32.46).
- Discount: $89.99 jacket − 30% off → use Tab 4 ($62.99).
Frequently Asked Questions
How do you calculate what percent one number is of another?
Divide the first number by the second, then multiply by 100. Example: 15 ÷ 60 × 100 = 25%.
How do you calculate percentage change?
Subtract old from new, divide by old, multiply by 100. Example: (100 − 80) ÷ 80 × 100 = +25%.
How do you add a percentage to a number?
Multiply by (1 + percent/100). Example: $100 + 8% = 100 × 1.08 = $108.
What is the formula for a percentage?
(Part ÷ Whole) × 100 = percentage. Works for discounts, tax, scores, and any ratio.