Percentage Calculator

Amaze SEO Tools provides a free Percentage Calculator that handles the three most common percentage questions people encounter in everyday math, shopping, finance, academics, and professional work.

Percentages are everywhere — discount tags, tax rates, exam scores, tip calculations, business metrics, investment returns, and statistical data. Despite being fundamental, percentage math trips people up surprisingly often, especially when the question is phrased in reverse (like "25 is what percent of 200?" or "30 is 15% of what?"). Mental arithmetic gets unreliable fast, and reaching for a formula you half-remember wastes time.

Our calculator eliminates the guesswork. Three clearly worded rows present the three standard percentage questions. Fill in the two known values in the appropriate row, click its Calculate button, and the missing number appears instantly in the result field beside it.

The Three Calculation Rows

The tool features three independent calculation rows. Each row solves a different type of percentage problem, and each has its own Calculate button and result field:

Row 1: "What is ___ % of ___"

This row answers the most common percentage question: finding a specific percentage of a given number.

• First field — Enter the percentage value (e.g., 20).
• Second field — Enter the base number (e.g., 150).
• Calculate — Click to compute the result.
• Result — Displays the answer (e.g., 30 — because 20% of 150 is 30).

Typical use cases: Calculating discounts on prices, figuring out tax amounts, determining tip totals, computing commission earnings, or finding a fraction of any quantity.

Row 2: "___ is what % of ___"

This row solves the reverse question: determining what percentage one number represents of another.

• First field — Enter the part value (e.g., 45).
• Second field — Enter the whole/total value (e.g., 200).
• Calculate — Click to compute the result.
• Result — Displays the percentage (e.g., 22.5% — because 45 is 22.5% of 200).

Typical use cases: Calculating exam score percentages, determining what fraction of a budget was spent, measuring completion rates, computing profit margins, or expressing ratios as percentages.

Row 3: "___ is ___ % of what?"

This row answers the least intuitive but equally important question: finding the original whole when you know a part and its percentage.

• First field — Enter the known part value (e.g., 60).
• Second field — Enter the percentage that part represents (e.g., 25).
• Calculate — Click to compute the result.
• Result — Displays the original whole number (e.g., 240 — because 60 is 25% of 240).

Typical use cases: Reverse-calculating original prices from discounted amounts, finding total populations from sample percentages, determining full budgets from partial allocations, or recovering base values in statistical analysis.

Shared Element

reCAPTCHA (I'm not a robot)

A single reCAPTCHA sits beneath all three rows. Complete this verification once, and you can use any of the three Calculate buttons freely.

How to Use Percentage Calculator – Step by Step

1. Open the Percentage Calculator on the Amaze SEO Tools website.
2. Identify which type of question you're solving — are you finding a percentage of a number (Row 1), finding what percent one number is of another (Row 2), or finding the original total (Row 3)?
3. Enter your two known values into the corresponding row's input fields.
4. Complete the reCAPTCHA if you haven't already.
5. Click the "Calculate" button on that specific row.
6. Read the result in the gray field next to the Calculate button.

Real-World Percentage Problems Made Easy

Here's how each row maps to situations you actually encounter:

• Shopping discounts — "A jacket is $80 and the store offers 30% off. What's the discount amount?" Use Row 1: What is 30% of 80? Answer: $24 off.
• Restaurant tipping — "My bill is $65 and I want to leave an 18% tip." Use Row 1: What is 18% of 65? Answer: $11.70 tip.
• Exam grades — "I scored 42 out of 50 questions correct. What's my percentage?" Use Row 2: 42 is what % of 50? Answer: 84%.
• Sales performance — "Our team closed $175,000 against a $500,000 target. What percentage did we hit?" Use Row 2: 175,000 is what % of 500,000? Answer: 35%.
• Reverse-calculating prices — "I paid $63 after a 10% discount. What was the original price?" Use Row 3: 63 is 90% of what? Answer: $70. (Note: 90% because you paid the remaining portion after the 10% discount.)
• Survey extrapolation — "120 people in our survey said yes, representing 15% of respondents. How many total people responded?" Use Row 3: 120 is 15% of what? Answer: 800 respondents.

Why Choose Amaze SEO Tools for Percentage Calculations?

• Completely Free — No sign-up, no fees, no calculation limits.
• All Three Question Types — Most percentage tools only handle "X% of Y." Ours solves all three standard percentage problems from a single page.
• Independent Rows — Each row operates on its own. Calculate different problems simultaneously without clearing previous inputs.
• Natural Language Layout — The rows are phrased as plain English sentences ("What is ___ % of ___"), so you always know exactly which numbers go where.
• Instant Inline Results — Answers appear right next to the Calculate button, keeping the input and output on the same line for easy reading.
• Decimal Precision — Results include decimal places for accuracy, essential when working with financial figures or scientific data.

Frequently Asked Questions (FAQ)

Q: Is the Percentage Calculator free?

A: Yes. The tool by Amaze SEO Tools is fully free — no account, no fees, and no restrictions.

Q: Can I use all three rows in the same session?

A: Absolutely. Each row is independent. You can fill in and calculate all three problems one after another (or even simultaneously) without resetting between them.

Q: What's the difference between the three rows?

A: Row 1 finds a percentage of a number (e.g., 20% of 150 = 30). Row 2 finds what percentage one number is of another (e.g., 45 is 22.5% of 200). Row 3 finds the original whole from a known part and percentage (e.g., 60 is 25% of 240).

Q: How do I calculate a percentage increase or decrease?

A: Use Row 2. Find the difference between the old and new values first, then ask "that difference is what % of the original value?" For example, if a price rose from $50 to $65, the increase is $15. Then: 15 is what % of 50? Answer: 30% increase.

Q: Can I enter decimal numbers?

A: Yes. All three rows accept decimal values in both input fields. You can enter figures like 7.5, 33.33, or 1250.75 without any issues.

Q: Why does Row 3 seem confusing?

A: Row 3 answers a less intuitive question — working backwards from a partial value to find the original whole. Think of it as "reverse engineering" a percentage. If you know the result and the percentage, Row 3 tells you what the starting number must have been.

Solve any percentage problem in seconds — use the free Percentage Calculator by Amaze SEO Tools and get accurate answers for all three types of percentage questions!