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.
Use this Percentage Calculator to find a percentage of a number, determine what percent one number is of another, or find the whole when a part and percentage are known.
Calculation Methods
Find p% of x:
Result = x × (p ÷ 100)
Find what percent x is of y:
Percent = 100 × x ÷ y
Find the whole:
Whole = 100 × part ÷ percent
Example
Find 15% of 330:
330 × 0.15 = 49.5
Therefore, 15% of 330 is 49.5.
Important Note
Percent means “per hundred,” so 20% equals 0.20 in decimal form. Calculations that require division by zero are undefined.