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Scientific Calculator

Full scientific calculator with trigonometry (DEG/RAD), logarithms, powers, memory and history.

Related tools

All Numbers & arithmetic tools →
Scientific notation converterConvert a number into scientific notation (mantissa × 10ⁿ).Amicable Number CheckerCheck whether two numbers are amicable — or give just one and get its candidate partner plus the verified loop, with perfect and sociable numbers identified.Arctan2 Calculator (atan2 of y and x)atan2(y, x) is not atan(y/x): it reads the signs of both arguments to place the angle in the right quadrant over the full −180°…180° turn, and it stays defined when x = 0. Enter x and y, read the angle in degrees or radians, see the quadrant and the point plotted. For a single ratio with no quadrant information, use the arctan calculator instead.Common Factor CalculatorFind every common factor of 2 to 10 numbers, with the greatest common factor highlighted and coprime pairs flagged.Divisibility Test CalculatorTest a number against the divisors 2 to 12, the primes up to 100 or your own list — and see the mental rule and the working, not just yes or no.e Digits Calculator (Euler's Number)Compute up to 1,000 decimals of Euler's number e from the series Σ 1/k!, with digit frequencies, a digit search and the 1828 1828 trap explained.Even or Odd CheckerPaste a whole list of numbers and get each one classified even or odd, with the counts and the parity rule explained — including 0 and negative numbers.Factor CalculatorList every divisor of a whole number in pairs, with the divisor count, the divisor sum, and whether it is prime, perfect, abundant or deficient.

Open Scientific Calculator and you get an answer straight away, with no account to create. You will find it under Numbers & arithmetic, with Scientific notation converter and Amicable Number Checker for the neighbouring cases.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Scientific Calculator?

Full scientific calculator with trigonometry (DEG/RAD), logarithms, powers, memory and history.

When would I actually use this?

Reading a number written another way: a Roman numeral on a monument, a hexadecimal colour, a binary byte, or a fraction that needs reducing.

What is the most common mistake?

Assuming a decimal fraction survives a change of base. A tenth is exact in decimal and infinitely repeating in binary, which is why 0.1 + 0.2 is not 0.3 in most programming languages.

How is Scientific Calculator different from Scientific notation converter?

They sit next to each other but answer different questions: Scientific notation converter is the one to open when you need it to convert a number into scientific notation (mantissa × 10ⁿ). Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Amicable Number Checker is the closest one after this: Check whether two numbers are amicable — or give just one and get its candidate partner plus the verified loop, with perfect and sociable numbers identified.

What else is worth having open alongside it?

Arctan2 Calculator (atan2 of y and x) and Common Factor Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Base conversion and number-theory results are exact. Roman numerals follow the standard subtractive form used since the Middle Ages, which is not the only one the Romans themselves used.

Further reading

All guides →
How-toScientific Notation ExplainedScientific notation writes huge and tiny numbers as a value times a power of ten. Here's how to write it, read the exponent, and convert back.ExplainerThe Pythagorean Theorem ExplainedIn a right triangle, a² + b² = c². Here's what the formula means, a worked example, how to find any side, and where it's used in real life.ExplainerRoman Numerals ExplainedSeven letters, added or subtracted. Here's what each stands for, how the subtractive pairs work, how to write any number, and where they still appear.How-toHow to Round Numbers: Round Half Up, Round Half to Even, and MoreRound to any decimal place or number of significant figures, and learn when to use round half up versus round half to even to avoid bias.ExplainerSignificant Figures Explained: Counting, Rounding, and Why They MatterLearn what counts as a significant figure, the rules for leading, trailing, and captive zeros, and how sig figs keep your calculated answers honest.How-toHow to Find Prime Factors: Factor Trees and the Division MethodBreak any whole number into its prime building blocks with a factor tree or repeated division — and write the result as a clean prime factorization with exponents.