How do I use this online calculator?

Click the keys or type on your keyboard — digits, + − × ÷, Enter for equals, Escape to clear, Backspace to delete. The result appears on the display and in the history below.

Does the calculator follow order of operations?

Yes. Multiplication and division are evaluated before addition and subtraction, and you can use parentheses to group parts of a calculation, e.g. (2 + 3) × 4 = 20.

What do the MC, MR, M+ and M− keys do?

They control the memory register: M+ adds the current value to memory, M− subtracts it, MR types the stored value into your calculation, and MC clears the memory. An M indicator shows when memory holds a value.

How does the percent key work?

The % key divides the preceding number by 100, so 50% is 0.5 and 200 × 10% is 20. To add 10% to 200, calculate 200 + 200 × 10%.

Can I reuse an earlier calculation?

Yes — every completed calculation is kept in the history tape below the keypad. Click any entry to load its expression back into the display.

Why does it say “Division by zero”?

Dividing any number by zero has no defined value in arithmetic, so the calculator shows an error instead of a misleading result. Correct the divisor and press = again.

Calcolatrice di base

Domande frequenti

How do I use this online calculator?: Click the keys or type on your keyboard — digits, + − × ÷, Enter for equals, Escape to clear, Backspace to delete. The result appears on the display and in the history below.
Does the calculator follow order of operations?: Yes. Multiplication and division are evaluated before addition and subtraction, and you can use parentheses to group parts of a calculation, e.g. (2 + 3) × 4 = 20.
What do the MC, MR, M+ and M− keys do?: They control the memory register: M+ adds the current value to memory, M− subtracts it, MR types the stored value into your calculation, and MC clears the memory. An M indicator shows when memory holds a value.
How does the percent key work?: The % key divides the preceding number by 100, so 50% is 0.5 and 200 × 10% is 20. To add 10% to 200, calculate 200 + 200 × 10%.
Can I reuse an earlier calculation?: Yes — every completed calculation is kept in the history tape below the keypad. Click any entry to load its expression back into the display.
Why does it say “Division by zero”?: Dividing any number by zero has no defined value in arithmetic, so the calculator shows an error instead of a misleading result. Correct the divisor and press = again.

Che cos'è questa calcolatrice online?

Una calcolatrice su schermo gratuita per l'aritmetica di tutti i giorni: addizione, sottrazione, moltiplicazione, divisione, percentuali e radici quadrate. Rispetta l'ordine delle operazioni, supporta le parentesi e conserva la cronologia dei calcoli recenti.

Come si usa

Fai clic sui tasti o digita direttamente: cifre, + − × ÷, Invio per l'uguale, Esc per cancellare.
Usa le parentesi per raggruppare: (2 + 3) × 4 = 20.
% divide il numero precedente per 100 — 200 × 10% = 20.

Tasti di memoria

M+ aggiunge il valore corrente alla memoria, M− lo sottrae, MR lo richiama e MC azzera la memoria.

Limiti

I risultati sono esatti fino a circa 15 cifre significative.
La divisione per zero mostra un errore invece di un risultato sbagliato.