Free online calculator for everyday arithmetic, scientific calculations, percentages, and equation solving. Calculate results instantly in your browser on desktop or mobile.
Optimizing tool for speed and clarity
Use Atoolix as a fast online calculator for percentages, everyday arithmetic, and equation solving. Everything is available from one responsive interface, so you can switch between the calculation you need without opening another app.
The page is organized around common calculation intent: percentage questions, quick calculations, and supported equation-solving tasks are kept together while specialized financial tools remain on their own dedicated pages.
Percentage problems usually fall into a few repeatable patterns. Atoolix puts the most useful ones in the same calculator so you can choose the question that matches your numbers.
Find a percentage amount from a base number. For example, 20% of 150 is 30.
(X ÷ 100) × Y
Find the percentage represented by one value compared with another. For example, 45 is 25% of 180.
(X ÷ Y) × 100
Compare an original value with a new value to see how much it changed in percentage terms.
((New − Original) ÷ |Original|) × 100
Apply a known percentage increase or decrease to a starting number. This is useful for price changes, discounts, markups, growth assumptions, and quick estimates.
Value × (1 ± Percentage ÷ 100)
Choose Percentage Calculator, Calculator, or Equation Solver.
Enter the numbers or mathematical expression required for the selected calculation.
Review the result and, where available, the formula used to produce it.
Work out a discount amount or apply a percentage reduction to a price.
Measure the percentage increase or decrease between two values.
Convert a part and total into a percentage.
Compare changes in sales, traffic, revenue, or other numeric measurements.
When the calculation is more specialized than everyday math, use the dedicated Atoolix tool for that intent.
Atoolix combines a percentage calculator, general calculator, and equation solver on one page. Use the percentage calculator for common percentage questions, the calculator for everyday arithmetic, and the equation solver for supported mathematical equations.
Divide the percentage by 100 and multiply it by the number. For example, 20% of 150 is (20 ÷ 100) × 150 = 30.
Use the percentage change mode and enter the original and new values. The calculation is ((new value − original value) ÷ |original value|) × 100, with the direction shown as an increase or decrease.
Yes. Enter the part and whole values in the X is what % of Y mode. The calculator divides the part by the whole and multiplies the result by 100.
Yes. Use the Add / Subtract % mode to apply a percentage increase or decrease to a starting value.
Yes. The calculator interface is responsive and can be used on phones, tablets, laptops, and desktop computers.
No. The calculator is available in the browser and does not require an account or software installation.
Results are provided for general calculation purposes. Verify important financial, tax, legal, or business decisions against the rules and source data that apply to your situation.
Choose the calculator based on how your money moves. SIP and Lumpsum estimate future value, CAGR summarizes growth between two values, and XIRR is designed for cash flows that occur on different dates.
If you need a different financial calculation, explore the fullfinance calculator collection.
Estimate the future value of regular investments made at recurring intervals.
Estimate the future value of a one-time investment using an assumed annual return.
Calculate the annualized compound growth rate between a starting and ending value.
Calculate an annualized return when investments or withdrawals happen on different dates.
| Your situation | Best fit |
|---|---|
| I invest a fixed amount regularly | SIP Calculator |
| I invest one amount at once | Lumpsum Calculator |
| I know the starting and ending values | CAGR Calculator |
| I have multiple cash flows on specific dates | XIRR Calculator |