Frequently Asked Questions
How do I calculate X% of Y?
Multiply: (X/100) × Y. So 15% of 80 = 0.15 × 80 = 12. Many tip and discount problems reduce to this simple formula.
What is percent change?
Percent change = (new − old) / old × 100. From 50 to 65 is +30%. Always divide by the original value, not the new one.
Why does a 50% loss require a 100% gain to break even?
A $100 stock dropping 50% becomes $50. To return to $100, the $50 must double, which is +100%. Losses and gains are not symmetric in percentage terms.
What is the difference between percentage and percentage points?
If a rate goes from 5% to 7%, that is a 2 percentage point increase but a 40% relative increase. Confusing the two is a common reporting error.
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Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.