Universal Percentage Math
Solve complex percentage variables instantly. Quickly determine margins, reverse tax equations, or calculate raw percental differences.
Percentage Calculator
X% of Y
Result:
What percent is A of B?
Result: %
Increase/Decrease by X%
Increased:
Decreased:
Percentage Change
Change: %
Reverse Percentage (Find Base)
Base Value:
Find Original (Reverse Increase/Decrease)
Original (if increased):
Original (if decreased):
Percentage Points Difference
Difference: points
Sales Tax Calculator
Price with Tax:
Price before Tax:
Stacked Discounts (Double Discount)
Final Price:
Effective Total Discount: %
Price Change & Discount Combo
Price after Markup:
Final Price after Discount:
Net Percentage Change: %
Every Formula You Need
This rapid engine natively processes the four core percentage algebraic variations.
What is X% of Y?
Example: What is 20% of 350? → 70
Best for: Calculating retail discounts, sales tax, server tips, sales commission, or compounding interest.
X is what % of Y?
Example: 45 is what % of 180? → 25%
Best for: Determining exact exam score margins, determining total fraction used against a set quota.
Percentage Increase
Example: Price hiked ₹400 to ₹520 → +30% increase
Best for: Quantifying gross salary bumps, evaluating historical inflation, monitoring year-over-year revenue.
Reverse Percentage
Example: ₹630 after 5% tax → original was ₹600
Best for: Finding original retail cost before an aggressive supplier discount was forcefully applied.
Everyday Arithmetic Workflows
Skip the napkin math. Let our browser-native script solve daily hurdles instantaneously.
Shopping Discount
"A jacket costs ₹2,500 but has a 30% discount. How much do I pay?"
₹2,500 × 30% = ₹750 off → Pay ₹1,750
Restaurant Tip
"My bill is $48.60. I want to leave an 18% tip. How much?"
$48.60 × 18% = $8.75 → Total: $57.35
Salary Hike
"I earn ₹60,000/month. Got a 12% raise. What's my new salary?"
₹60,000 × 12% = ₹7,200 → New: ₹67,200
GST Calculation
"Product costs ₹850 before 18% GST. What's the final price?"
₹850 + (₹850 × 18%) = ₹850 + ₹153 = ₹1,003
Investment Return
"I invested ₹50,000. It's now ₹68,000. What's the return?"
(₹68,000 - ₹50,000) ÷ ₹50,000 × 100 = +36%
Final Grade
"I scored 72 out of 90 marks overall. What's my exact percentage?"
(72 ÷ 90) × 100 = 80%
Frequently Asked Questions
How do I calculate percentage decrease?
Use the "Percentage Change" tab: enter the original (larger) value and the new (smaller) value. The result shows as a negative percentage — e.g. going from 80 to 60 is a -25% change.
What does "reverse percentage" mean?
It finds the original value before a percentage was applied. For example, if a bill totals $120 including a 20% service fee, reverse percentage tells you the pre-fee amount was $100 — useful for backing tax or discounts out of a final price.
What's the difference between percentage change and percentage points?
If an interest rate goes from 4% to 6%, that's a rise of 2 percentage points, but a 50% increase (since 2 is half of 4). Mixing these up is one of the most common percentage mistakes in news and finance.
How do I add GST or tax to a price?
Multiply the base price by the tax rate and add it on: ₹850 with 18% GST is ₹850 + (₹850 × 0.18) = ₹1,003. To remove GST from a final price, use reverse percentage instead — don't just subtract 18%, that gives the wrong answer.
Why can't I just subtract a percentage to undo it?
Because the percentage applies to a different base each way. A 20% increase on 100 gives 120, but a 20% decrease on 120 gives 96, not 100. Undoing a percentage requires dividing by (1 + rate), which is what the reverse percentage mode does.
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About This Utility
This tool is provided completely free of charge by Mavertex. Built by Kumar (an independent UI developer), our platform ensures your privacy by executing all operations strictly within your local browser DOM.
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