Percentage Calculator
Five quick mini-calculators to handle basic percentages, increases, decreases, change, and difference.
Enter values to see the answer.
Example: $100 + 20% = $120.
Example: $100 – 25% = $75.
Positive = increase, negative = decrease.
Uses the average of both values as the base.
Five Mini Calculators in One
Whether you’re tracking grades, planning budgets, or analyzing growth, this calculator handles every percentage scenario with clear explanations and live answers.
What you can do
🎯 Basic Percentage
Find what percent of a number quickly.
📈 Percent Increase
See new totals after price hikes, raises, or profits.
📉 Percent Decrease
Calculate sale prices or depreciation.
🔁 Percent Change
Compare old vs new values over time.
⚖️ Percent Difference
Compare two values relative to their average.
📱 Mobile Ready
All calculators work perfectly on phones and tablets.
Quick tips
- Use decimals for fractions (12.5 = 12½%).
- For stacked percentage changes, calculate sequentially.
- Remember: a 20% drop followed by a 20% rise won’t return to the original number.
Frequently Asked Questions
(Percent ÷ 100) × Number = Result. For example, 15% of 80 = (0.15 × 80) = 12.
Percent change compares new vs old value. Percent difference compares two values using their average—great for comparing products or test scores.
Yes! If something doubles, that’s a 100% increase. Tripling is 200%, and so on.
If you know the new value and percent change, divide by (1 ± percent) to find the original. Example: $120 after 20% increase → 120 / 1.2 = $100 original.