Percentage Calculator

Accurate solutions for daily math. Calculate percentages, percentage changes, and conversions with step by step formulas provided for every calculation.

Common Percentage Questions

What is
% of
See formula

Formula: (X / 100) × Y

Example: 20% of 50 is (20/100) × 50 = 10.

is what % of
See formula

Formula: (X / Y) × 100

Example: 10 is what % of 50? (10/50) × 100 = 20%.

is
% of what?
See formula

Formula: X / (Y / 100)

Example: 10 is 20% of what? 10 / 0.20 = 50.

Percentage Change and Difference

Change from
to
See formula

Formula: ((New - Old) / |Old|) × 100

Shows percentage increase (positive) or decrease (negative).

Difference between
and
See formula

Formula: (|A - B| / ((A + B) / 2)) × 100

Used when comparing two values where neither one is the starting point.

Marks Percentage Calculator

How to calculate marks

Formula: (Scored marks / Total marks) × 100

Percentage to decimal and fraction

%
Decimal
Fraction

Tips: Use the Tab key to move to the next field. Press Enter inside a line to calculate.