What operations does this basic calculator support?

This calculator supports the four basic math operations: addition (+), subtraction (−), multiplication (×), and division (÷). It also supports percentage conversion (%), sign toggling (+/−), squaring a number (x²), square root (√x), raising to any power (xⁿ), and nth root (ⁿ√x) for quick everyday calculations.

Can I use my keyboard instead of clicking buttons?

Yes. Number keys (0-9) enter digits, +, -, *, and / trigger operations, Enter or = calculates the result, Backspace deletes the last digit, Escape clears the calculator, Q squares the current value, R takes the square root, ^ raises to a power, and N computes the nth root.

What happens if I divide by zero?

Dividing by zero is mathematically undefined, so the calculator displays "Error". Press C or Backspace to clear the error and continue with a new calculation.

How does the full expression display work?

As you chain operations (e.g., 2 + 6 + 7), the entire expression is shown above the result display in real time. When you press equals, the full expression is saved to your history so you can review the complete calculation later.

How many past calculations can I see?

The calculator stores up to 50 recent calculations in your browser's local storage. History persists across page refreshes and browser sessions until you explicitly clear it using the Clear button in the history section.

Does the calculator save my data or send it anywhere?

All calculations run entirely in your browser using JavaScript. Nothing is sent to a server or tracked. Your calculation history is stored in your browser's local storage for convenience and persists across sessions. You can clear it at any time using the Clear button.

How do the square and square root operations work?

The x² button squares the current display value (multiplies it by itself). The √x button takes the square root of the current value. Taking the square root of a negative number will show an Error. Both operations integrate into the expression chain for accurate history tracking.

How do the nth power and nth root operations work?

The xⁿ button raises a number to any power. Enter the base number, press xⁿ, then enter the exponent and press = to get the result (e.g., 2 xⁿ 5 = 32). The ⁿ√x button finds the nth root of a number. Enter the number, press ⁿ√x, enter the root index, and press = (e.g., 27 ⁿ√x 3 = 3). Odd integer roots of negative numbers are supported (e.g., -8 ⁿ√x 3 = -2). Even or non-integer roots of negative numbers will display Error. You can also use ^ on the keyboard for power and N for nth root.

Basic Calculator - Free Online Math Calculator

How to Use

Tap the number keys or use your keyboard to enter the first number.
Select +, −, ×, or ÷ to choose an operation.
Type the second number, then tap = or press Enter for the result.
Keep chaining operators and numbers to perform multi-step calculations. The full expression chain is displayed above the result.
Use % to convert the current number to a percentage, or +/− to flip its sign.
Use x² to square the current value, or √x to take the square root (press Q or R on keyboard).
Use xⁿ to raise a number to any power: enter the base, press xⁿ, enter the exponent, then press =. Use ⁿ√x similarly for nth roots (press ^ or N on keyboard).
Check Recent Calculations below the display to review your history. History persists across sessions via local storage.
Use the Clear button next to Recent Calculations to remove all saved history.
Use C to clear everything or Backspace to remove the last digit typed.

How it Works

The calculator processes one operation at a time, in the order you enter it (left to right), rather than following full mathematical operator precedence. For example, entering 2 + 3 × 4 calculates (2 + 3) × 4 = 20, not 14. This matches how most simple pocket calculators behave.

As you chain operations, the full expression (e.g., "2 + 6 + 7") is displayed above the current result so you can always see your complete calculation sequence.

Supported Operations:

• Addition (+) - combine two numbers
• Subtraction (−) - find the difference between two numbers
• Multiplication (×) - scale one number by another
• Division (÷) - split a number into equal parts
• Square (x²) - multiply a number by itself
• Square Root (√x) - find the value that when multiplied by itself gives the input
• Power (xⁿ) - raise a number to any exponent (e.g., 2^5 = 32)
• Nth Root (ⁿ√x) - find the nth root of a number (e.g., ³√27 = 3, ³√-8 = -2)
• Percent (%) - convert the current value to a decimal fraction (e.g., 50 becomes 0.5)
• Sign toggle (+/−) - switch between positive and negative

Calculation History:

Your calculation history is automatically saved to your browser's local storage, so it persists even after you close the tab or refresh the page. Up to 50 recent calculations are retained, each showing the full expression chain and result. Use the Clear button to remove all saved history at any time.

Error Handling:

Dividing by zero is undefined in mathematics, so the calculator shows "Error" instead of a result. Taking the square root of a negative number also produces an error. For nth roots, odd integer root indices of negative numbers are supported (e.g., ³√-8 = -2), but even or non-integer root indices of negative numbers will show "Error" since they are undefined in real numbers. Press C or Backspace to reset and continue calculating.

Common Use Cases

Everyday Math

• Split a restaurant bill evenly among friends
• Add up grocery totals before reaching the checkout
• Calculate quick discounts while shopping in-store
• Convert recipe measurements when scaling servings up or down

Work & School

• Check homework arithmetic without switching apps
• Total up hours worked for timesheet entries
• Calculate quick estimates during meetings or calls
• Find square roots for geometry or physics homework

Budgeting & Shopping

• Track running totals while comparing prices
• Divide shared expenses among roommates fairly
• Calculate tips and service charges on the spot
• Estimate monthly expenses by adding line items

Quick Reference

• Perform fast arithmetic without opening a dedicated app
• Review past calculations from persistent history
• Use on any device with a browser, no installation needed
• Square numbers or find roots for quick math checks

Basic Calculator