Math & Algebra

Percentage Calculator

What is X% of Y?

Mode X Y

Educational estimates only. Not medical, legal, tax, or financial advice.

Guide: Percentage Calculator

What it does

Handles common percentage word problems in one place.

How to use it

Pick the mode, enter the values requested, then calculate.

Formula

p% of x = (p/100)×x; change = (new−old)/old × 100%.

Example

What is 15% of 200? → 30.

FAQs

Why is my answer negative?

Percent change can be negative if the value decreased.

How do I find what percent A is of B?

Use the ratio mode: (A÷B)×100%, unless the form labels a dedicated option.

Rounding for money?

Round only at the end for display; keep full precision during intermediate steps.