Percentage Calculator
Calculate percentage values, percentage changes, retail discounts, markups, and tax.
1. What is X% of Y?
What is
% of
=
30
2. X is what percent of Y?
is what % of
=
25%
3. Percentage Increase / Decrease
From
to
=
+25% (Increase)
Discount Calculator
You Save:
$12.00
Final Price:
$68.00
Sales Tax Calculator
Tax Amount:
$4.25
Total with Tax:
$54.25
Percentage Formulas & How to Calculate
View All Math Formulas Handbook →Percentage of a Value
Calculating $P\%$ of base $X$:
$$ \text{Value} = \left(\frac{P}{100}\right) \times X $$
What Percentage is $X$ of $Y$
Ratio converted to percentage:
$$ P = \left(\frac{X}{Y}\right) \times 100\% $$
Percentage Change (Increase / Decrease)
Difference relative to initial value:
$$ \Delta\% = \left(\frac{V_{\text{final}} - V_{\text{initial}}}{|V_{\text{initial}}|}\right) \times 100\% $$
Discounted Final Price
Original price minus percentage savings:
$$ P_{\text{final}} = P_{\text{original}} \times \left(1 - \frac{\text{Discount}\%}{100}\right) $$