Free online percentage calculator

How to use

1. Pick the mode that matches your question using the radio buttons at the top.
2. Enter the two values — X and Y. The labels tell you what each one represents.
3. The result updates as you type.
4. Use “Share with my numbers” to send the specific calculation to someone else.

The five modes

Worked examples

Tip on a restaurant bill: 18% of $54.50 → use mode 1 → $9.81

Sale discount: An item originally $80 is now $60. What’s the discount? → 60 is what % of 80? → 75%, so a 25% discount.

Salary raise: You earn $65,000 and get a 4.5% raise. Increase $65,000 by 4.5% → $67,925.

Stock drop: A stock fell from $120 to $90. Percent change → (90 − 120) / 120 × 100 = −25%.

Notes

• “Percent” vs. “percentage point” — if a bank rate moves from 4% to 5%, that’s a 1 percentage point increase but a 25% relative increase. News headlines routinely confuse these; the math above shows both.
• Symmetry trap — a 20% drop followed by a 20% gain does not return to the start. $100 × 0.80 × 1.20 = $96, a 4% net loss. You need a 25% gain to recover from a 20% loss.
• Division by zero (Y = 0 in the “what percent” and “percent change” modes) returns a dash rather than crashing.
• Results are rounded to 6 decimal places for display.