Online Calculator
A fast, free basic calculator for everyday math — add, subtract, multiply and divide, with percent, sign toggle and memory keys. Tap the buttons or use your keyboard, right in your browser.
Tip: you can also type with your keyboard — digits, + − * /, Enter for equals, Backspace to delete and Esc to clear.
Frequently Asked Questions
Can I use my keyboard with this calculator?
Yes. Type the digit keys and the + − * / operators, press Enter (or =) for equals, Backspace to delete the last digit, and Escape to clear everything. The % key works too.
Does it have memory keys?
Yes. MC clears the stored value, MR recalls it to the display, M+ adds the current number to memory and M− subtracts it. The current memory total is shown beneath the keypad whenever it is not zero.
Is this calculator free to use?
Completely. It runs entirely in your browser with no sign-up, no ads inside the tool and nothing sent to a server, so you can use it as often as you like.
Understanding the Online Calculator
The Online Calculator is a clean, fast basic calculator for everyday math, right in your browser. It handles the four core operations — addition, subtraction, multiplication and division — plus the conveniences you reach for most: a percent key, a sign toggle to flip positive and negative, and a full set of memory keys (MC, MR, M+, M−). A two-line display shows both the running expression and the current result, so you can follow a chain of calculations at a glance. There is nothing to install and no sign-up; everything runs locally on your device, so your numbers never leave your browser.
How it works
Tap the on-screen buttons or type on your keyboard — the calculator accepts both. Enter a number, choose an operator (+, −, ×, ÷), enter the next number, and press equals to see the result. Operations chain naturally: pressing another operator before equals applies the previous one and keeps going, so 5 + 3 × 2 evaluates left to right as you press. The percent key turns the current entry into a percentage of the running value, and the sign key flips it between positive and negative. Memory keys store a running total you can recall later. Dividing by zero shows "Error" instead of crashing, and you can clear with CE (current entry) or AC (everything).
Worked example
Suppose you are splitting a $90 dinner bill three ways and adding an 18% tip. Type 90 ÷ 3 and press equals to get 30 per person. Then take 30 × 18 % to get 5.40, the tip each person owes. Press M+ to store 5.40 in memory, key in 30 + and press MR to recall it, then equals — giving 35.40 as each person's total. AC clears everything so you are ready for the next bill.
Tips & common mistakes
- Use your keyboard for speed: digits and + − * / map directly, Enter (or =) computes, Backspace deletes the last digit, and Escape acts as AC.
- CE clears only the number you are typing without losing the operation in progress; AC wipes everything, including memory recall context.
- The percent key is contextual — mid-operation it works out a percentage of the running value (handy for tips and discounts), and on its own it just divides the entry by 100.
- Memory keys are great for totals: M+ adds the shown number to memory, M− subtracts it, MR recalls it, and MC clears it. The current memory total appears beneath the keypad whenever it is not zero.
- Press the ± key to flip a number's sign without retyping it — useful when a subtraction leaves you needing a negative starting value.
- Results are rounded to remove floating-point noise (so 0.1 + 0.2 shows 0.3), and very large or very long results switch to a compact form to stay readable.