Online Advanced Percentage Calculator
A complete, question-driven percentage calculator covering five formulas: find a percentage, a part, or a whole, and calculate increases and decreases.
Pick the question that matches what you need and fill in its values. You can answer several at once.
What is P% of a value?
A value is what percent of a total?
A value is P% of what total?
What percent of a value equals a result?
P% of what value equals a result?
What is P% of a value?
A value out of what total is P%?
What value out of a total is P%?
A value out of a total is what percent?
What is a value increased by P%?
A value plus what percent equals a result?
What value increased by P% equals a result?
What is a value decreased by P%?
A value minus what percent equals a result?
What value decreased by P% equals a result?
Result
What Is This Tool?
This is a comprehensive percentage calculator built around five core formulas, with a plain-English question under each one. Instead of remembering formulas, you simply pick the question that matches your problem, such as 'What is P% of a value?' or 'A value plus what percent equals a result?', enter the numbers you know, and get the answer. It covers finding a percentage, a part, or a whole, plus percentage increases and decreases, and you can answer several questions at once.
How to Use This Tool?
- Open the formula section that fits your problem.
- Find the question that matches what you need.
- Enter the values you already know.
- Click Calculate to see each answer.
Key Features
- Covers five percentage formulas in one tool.
- Offers a plain-English question for every calculation type.
- Finds a percentage, a part, or a whole value.
- Calculates percentage increases and decreases.
- Answers multiple questions in a single calculation.
Examples
- 10% of 10 is 1.
- 1 out of 10 is 10%.
- 10 increased by 10% is 11.
- 10 decreased by 10% is 9.
Common Use Cases
- Calculating discounts, taxes, and tips.
- Finding what percent one number is of another.
- Working out an original value before a change.
- Adding or removing a percentage from a price.
- Solving many kinds of percentage homework problems.
Tips & Best Practices
- Choose the question by its wording, not the formula.
- Enter percentages as plain numbers, without the % sign.
- Use the increase and decrease sections for markups and discounts.
- You can fill several questions and get all answers at once.
- Double-check which field is the percentage and which is the value.
Limitations
- Some questions can't be solved when a value would require dividing by zero.
- Results are rounded for readability.
- Each question solves for one unknown at a time.
- It works with numbers, not units or currencies directly.
Frequently Asked Questions
- Do I need to know the formula?
- No. Just pick the question that describes your problem, and the tool applies the right formula for you.
- What kinds of questions can it answer?
- It finds a percentage of a number, what percent one number is of another, the whole from a part, and the result of a percentage increase or decrease.
- Can I answer more than one question at once?
- Yes. Fill in any questions you need across the sections, and the tool shows an answer for each.
- Why is one of my answers missing?
- A question only produces an answer when both of its fields are filled with valid numbers.
Key Terminology
- Percentage
- A number expressed as a fraction of 100.
- Part
- The portion of a whole that a percentage represents.
- Whole
- The full base amount that equals 100%.
- Percentage increase
- Adding a percentage of a value back to that value.
- Percentage decrease
- Subtracting a percentage of a value from that value.