Calculation Mode
What is X% of Y?
What is
% of
?
Result
—
Formula: (X / 100) × Y
X is what % of Y?
is what % of
?
Result
—
Formula: (X / Y) × 100
Percentage Change (from → to)
From
to
% Change
—
Formula: ((New - Old) / Old) × 100
Increase / Decrease a Number by %
%
Result
Final Value
—
Change
—
Formula: Number × (1 ± %/100)
What % is X between Min and Max?
X =
Min =
Max =
% Position
—
Formula: ((X - Min) / (Max - Min)) × 100
Percentage Difference Between Two Numbers
and
% Difference
—
Formula: |A - B| / ((A + B) / 2) × 100
Reverse — Find Original Number
is
% of what?
Original Number
—
Formula: Result / (% / 100)
Discount Calculator
Original Price
Discount
%
Sale Price
—
You Save
—
Sale = Price × (1 - %/100) | Saving = Price × (%/100)
Markup & Profit Margin
Cost Price
Selling Price
Markup %
—
Margin %
—
Profit
—
Markup = (Sell-Cost)/Cost × 100 | Margin = (Sell-Cost)/Sell × 100
Tip Calculator
Bill
Tip
%
Split
Tip Amount
—
Total Bill
—
Per Person
—
Tip = Bill × (%/100) | Total = Bill + Tip | Per Person = Total / People
Quick % Table
Base number:
| % | Value | % | Value | % | Value |
|---|
History
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Quick Tips
10% of a number?
Simply divide by 10. e.g. 10% of 250 = 25
50% of a number?
Divide by 2. e.g. 50% of 380 = 190
25% of a number?
Divide by 4. e.g. 25% of 200 = 50
1% of a number?
Divide by 100. Then multiply for any %.
Reverse 20% added?
Divide by 1.2 to find original price.
Common Use Cases
💰 Sales Tax — Add % to price
🛍️ Discount — Subtract % from price
📈 Stock Change — % change formula
🍽️ Restaurant Tip — 15–20% of bill
📊 Exam Score — Marks / Total × 100
💹 Interest Rate — Principal × Rate%
🏦 Profit Margin — Profit / Revenue × 100