Percentage Calculator
Calculate percentages, percentage increase/decrease
About the Percentage Calculator
Percentages turn up everywhere — tips, test scores, sales, interest, statistics — and the question is rarely phrased the same way twice. The Percentage Calculator handles the three forms people actually ask: "What is X% of Y?", "X is what percent of Y?", and "X is Y% of what?".
That flexibility is the point. A student checks what percentage a score of 47 out of 60 represents. A shopper works out what 35% of a price comes to. An analyst back-solves the original figure when they only know the part and the percentage. Each mode relabels its inputs and shows a step-by-step breakdown, so you can follow the math rather than just trust a number.
How to Use the Percentage Calculator
- Pick the question that matches your problem from the three calculation types.
- Enter the first value — the input label changes to match the mode you chose.
- Enter the second value in the same way.
- Read the result, formatted to two decimals (with a % sign where the answer is itself a percentage).
- Review the step-by-step breakdown below to see exactly how the answer was derived, then Copy it if needed.
Why Use ToolForge’s Percentage Calculator
- Three distinct modes cover the common percentage questions, with inputs that relabel themselves so you always know which number goes where.
- Every result comes with a worked, step-by-step explanation — useful for students who need to show their method, not just the answer.
- It guards against division by zero, returning a clean zero instead of an error when a denominator is empty.
- Calculations are instant and run entirely in your browser, free and without sign-up.
Frequently Asked Questions
How do I find what percentage one number is of another?
Divide the part by the total and multiply by 100. For example, 47 out of 60 is (47 ÷ 60) × 100 ≈ 78.33%. Use the "X is what percent of Y?" mode and the calculator shows each step.
How do I calculate a percentage of a number?
Multiply the number by the percentage divided by 100. For 35% of 200, that is 200 × 0.35 = 70. The "What is X% of Y?" mode does this and displays the breakdown.
What does the third mode solve for?
"X is Y% of what?" works backward to find the original total when you know a part and what percentage it represents. If 70 is 35% of a number, the calculator finds that number (200) by dividing 70 by 0.35.
Why does it show 0 instead of an answer?
If a calculation would require dividing by zero — for instance, asking what percent a number is of zero — the tool returns 0 rather than an error. Check that your total or percentage field is not empty or zero.
