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Percentage Calculator - 6 Modes with Smart Detection

Calculate any percentage instantly - what is X% of Y, percentage change, discount, tax/VAT/GST, profit & loss, tip, and more. Type naturally and the right formula is detected automatically.

Always Free Smart auto-detection Visual breakdown Runs in browser
6 modes · Discount · Tax · Profit · Tip · % Change
Type naturally - the right formula is detected automatically
Visual bar shows the percentage portion instantly
6 modes: X% of Y, change, discount, tax, profit, tip
Try: 18% of 2500  ·  120 is what % of 800  ·  500 to 650 (% change)  ·  25% off 1200
🔢 X% of Y ❓ X is what % of Y 📈 % Change 🏷️ Discount 🧾 Tax / VAT / GST 💰 Profit & Loss 🍽️ Tip calculator
% of
=

What makes it different

Other percentage tools
make you pick the formula. This picks it for you.

Smart natural language detection, visual breakdown, six real-world modes - not just one formula in a box.

Smart auto-detection

Type "18% of 2500" or "from 500 to 650" and the right formula is detected and calculated instantly - no need to pick a mode.

just type naturally

Visual percentage bar

Every result shows a proportional bar so you can immediately see the percentage relative to the whole - not just a number.

makes sense visually

Discount calculator

Enter original price and discount %, get final price and amount saved instantly - with a visual showing what you keep vs what you save.

shopping made easy

Tax / VAT / GST modes

Add tax to a pre-tax price, or extract the tax from a tax-inclusive total. Quick rate buttons for 5%, 10%, 18% GST, 20% VAT and more.

both directions

% Change with direction

Percentage increase or decrease is shown with a clear green/red badge - no ambiguity about whether the change is positive or negative.

clear at a glance

Tip with bill split

Calculate tip and automatically split the total between 1–10+ people - one tool handles the whole restaurant table calculation.

split any way

Quick guide

Calculate any percentage in seconds

1

Type or pick a mode

Type your question naturally in the smart input - or click one of the six mode buttons to use a specific calculator.

2

Enter your numbers

Fill in the values. Results update instantly as you type - no need to press any button.

3

Read the breakdown

See the answer, the formula used, and a visual bar showing the proportion - all at once.

Percentage formulas - all six, explained

A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin "per centum" - per hundred. Every percentage calculation is a variation of the same core relationship: Percentage = (Part ÷ Whole) × 100.

The six most common percentage calculations

QuestionFormulaExample
What is X% of Y?Y × X ÷ 10018% of 2500 = 450
X is what % of Y?(X ÷ Y) × 100120 is 15% of 800
% change from A to B((B − A) ÷ A) × 100500 → 650 = +30%
Discount: X% off pricePrice × (1 − X/100)25% off 1200 = 900
Add tax rate T%Price × (1 + T/100)1000 + 20% = 1200
Profit/loss %((Sell − Cost) ÷ Cost) × 100(1000−800)÷800 = 25%
The flat rate vs effective rate trap. A "20% discount" and a "20% markup" are not inverses. If you buy something for 800 and mark it up 20%, the price is 960. But if you then give a 20% discount off 960, you get 768 - which is less than your original 800 cost. This is why discount and markup percentages are calculated on different bases, and why this tool keeps them as separate modes.

Understanding percentage change vs percentage points

These two terms are often confused. If a tax rate rises from 10% to 12%, the change is 2 percentage points - but it is a 20% percentage change (because 2 ÷ 10 × 100 = 20%). News articles and financial reports often use "percent" when they mean "percentage points" - always check what the base is.

Extracting tax from a tax-inclusive price

If you have a price that already includes tax and want to find the pre-tax amount, the formula is: Pre-tax = Inclusive price ÷ (1 + rate/100). For a 20% VAT-inclusive price of 1200: 1200 ÷ 1.20 = 1000 pre-tax, 200 VAT. The Tax mode handles both directions.

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FAQ

Percentage questions,
answered.

Ask a question
Divide the part by the whole and multiply by 100. For example: 45 ÷ 200 × 100 = 22.5%. Use the "X is what % of Y?" mode above.
Subtract the original from the new value, divide by the original, and multiply by 100. Positive = increase, negative = decrease.
Multiply the original price by the discount percentage and divide by 100 to get the discount amount. Subtract from the original price for the final price. Example: 20% off 150 = 30 discount, final price 120.
To add tax: multiply base price by (1 + rate/100). To extract tax from an inclusive price: divide by (1 + rate/100). Use the Tax/VAT/GST mode which handles both directions.
Subtract cost price from selling price to get profit or loss. Divide by cost price and multiply by 100. Positive = profit %, negative = loss %.
Percentage = (Part ÷ Whole) × 100. Rearranged: Part = (Percentage ÷ 100) × Whole. This tool handles all three arrangements automatically.