ercentage Calculator | Calculate %, Discounts, GST, and Changes Instantly

🧮 Ultimate Percentage Calculator

All common percentage problems in one tool: "X% of Y", "X is what % of Y", increase/decrease by %, % change, discount and GST/VAT add/remove, reverse % (find original price), and split by percentages.

Select Mode What is % of Y? X is what % of Y? Increase Y by X% Decrease Y by X% % Change from A to B Discount: Price minus X% Markup: Price plus X% Reverse %: Original before discount X% Add GST/VAT X% to Price Remove GST/VAT X% from Total

Rounding

2 decimals 0 decimals 1 decimal 3 decimals No rounding Currency symbol is cosmetic; math uses raw numbers.

A (value/percent)

B (base/price)

C (second value for % change)

Result

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—

Percent

—

if applicable

Base

—

if applicable

Change

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Δ and %Δ

Examples

Question	Inputs to Use	Answer
What is 25% of 1200?	Mode: "X% of Y" | A=25, B=1200	300
300 is what % of 1200?	Mode: "X is what % of Y" | A=300, B=1200	25%
Increase 800 by 12%	Mode: Increase | A=12, B=800	896
Discount ₹1500 by 20%	Mode: Discount | A=20, B=1500	₹1200
Reverse: Total 1180 includes 18% GST, original?	Mode: Remove GST | A=18, B=1180	1000

Formula notes: X% of Y = (X/100)×Y. X is what % of Y = (X/Y)×100. Increase/Decrease = Y×(1±X/100). % change = (B−A)/|A|×100. Reverse discount: Original = Price/(1−X/100). Remove tax: Pre‑tax = Total/(1+X/100).