Percentage calculator helps users solve three of the most common percentage problems in one place: finding p percent of a number, finding what percent one number is of another, and finding the whole when a part and percent are known. This makes it useful for homework, discounts, markups, finance, and general everyday math. Users can work inside the relevant mode, enter any two values, and let the calculator solve the missing one.
Percentage Calculator
Enter p as a percent (e.g., 15 = 15%). All fields sync live.
Mode 1 — How much is p% of x?
Example:
15% of 330 = 49.5. Relations: y = x × (p/100), p = 100 × y / x, x = 100 × y / p.
Mode 2 — x is what percent of y?
Formula:
p = 100 × x / y (when y ≠ 0).
Mode 3 — x is p% of which number?
Example:
30 is 20% of 150. Formula: y = 100 × x / p (when p ≠ 0).
Actions
Step-by-step derivation
Mode 1
Provide any two of p, x, y.
Mode 2
Provide any two of x, y, p.
Mode 3
Provide any two of x, p, y.
Reference
y = x × (p/100),p = 100 × x / y,y = 100 × x / p- Here, user inputs
pas a percentage number:20means20%.
Notes: If
y = 0, p = 100×x/y is undefined. If p = 0, y = 100×x/p is undefined.