Padasalai
Academic & Commerce Toolkit

Percentage & Discount Calculator

Solve the three most common percentage questions with transparent steps. Compare a value to the total, find percentage amounts, and project prices after increases, discounts, or taxes—all in one responsive tool.

A is what percent of B?
Enter any part and whole pair to understand contribution, mark distribution, or share of a bill.

Result

50%

75 is 50% of 150.

Working: (75 ÷ 150) × 100

What is X% of Y?
Use it for GST, tips, commissions, or savings targets. Enter the rate and the base amount.

Result

117

18% of 650 = 117.

Working: (18 ÷ 100) × 650

What is the final value after an X% change?
Model discounts, markups, or tax adjustments. Switch between increase and decrease to compare.

Result

1,136.625

Decrease of 12.5% on 1,299 removes 162.375, resulting in 1,136.625.

Working: 1,299 × (1 - 0.125)

Opposite scenario: 12.5% increase gives 1,461.375.

Why learners and shoppers love it
Designed for board exams, entrance tests, and everyday budgeting with clear maths and responsive layout.
Three quick solvers
Jump between part-versus-whole, percent-of, and increase-or-discount questions without switching tabs.
Step-by-step clarity
Each answer shows the working so students, teachers, and shoppers can double-check the logic.
Built for every device
Responsive layout and dark mode support keep the calculator readable on mobiles, tablets, and desktops.
How to use the calculator
Three quick steps cover the most frequent percentage questions.

Compare part and whole

Enter any two values to find the exact percentage share, perfect for grade reports and split bills.

Work out percentage of

Supply a rate and base to see the value instantly, handy for GST, tips, commissions, or savings.

Model price changes

Toggle between increase and discount to check final price, amount saved, and reverse scenarios.

Popular use cases
These scenarios show how flexible the tool is outside the classroom.

Commerce & economics homework

Translate textbook word problems into clear steps that can be copied into your solutions.

Shop smarter

Compare sale tags, cashback offers, or GST adjustments before you head to the billing counter.

Plan classroom assessments

Teachers can convert raw marks to percentages instantly and share the working via projector or screenshots.

Study tips & reminders
Always convert the percentage to a decimal fraction before multiplying to avoid misplaced decimals.
When comparing a part to the whole, check that the whole is non-zero to keep the calculation valid.
For successive discounts or taxes, apply one rate at a time and use the final output as the next baseline.
Frequently asked questions

Does the calculator support negative numbers?

Yes. Negative inputs are treated as losses or reverse changes, which is helpful for credit notes or corrections.

How many decimal places are supported?

Answers display up to four decimal places. You can round manually if your worksheet requires fewer digits.

Can I chain multiple percentage changes?

You can reuse the final output of one calculation as the base for the next to simulate multiple adjustments in order.