Percentage Calculator
Calculate increases, discounts and percentage differences.
20% · 250
50
- Formula
- (20 × 250) / 100
How it works
Percentage is a ratio expressed out of 100. The symbol % means "per hundred".
Basic formulas:
Part = (% × Total) / 100 Increase = Value × (1 + % / 100) Discount = Value × (1 − % / 100) Change A→B = ((B − A) / A) × 100
Practical examples
20% of $250
(20 × 250) / 100 = $50.
$120 with 15% discount
120 × (1 − 0.15) = $102. You save $18.
From 80 to 100
((100 − 80) / 80) × 100 = +25%.
Frequently asked questions
How do I compute percentages in my head?
10% = divide by 10; 1% = divide by 100. Combine these blocks for any target value.
Does +50% then −50% return the original?
No. 100 → +50% = 150 → −50% = 75. Discount applies to the already-changed value.
What are 'percentage points'?
The absolute difference between two percentages. 10% → 15% is +5 points (or +50% relative).
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⚠️ Disclaimer
This calculator is for educational and informational purposes only. Results are estimates based on public formulas and may contain inaccuracies or be outdated. We are not accountants, lawyers, doctors, or financial advisors — for any important decision (tax filings, contracts, diagnoses, financial planning), always consult a qualified professional. calculadora.work assumes no liability for decisions made based on the content of this site.