What does BigInt precision mean and why does it matter?

JavaScript numbers are 64-bit floats, which lose integer precision above 2^53 (about 9 quadrillion). BigInt is a separate type that holds arbitrary-size integers exactly. Every tool that claims exact uses it, so a sum of 10,000 50-digit numbers returns the correct 51-digit total rather than an approximation.

Why 5,000 digits for pi and not more?

Browser memory and responsiveness. Past 5,000 digits, the spigot algorithm slows noticeably and the output becomes hard to work with in-browser. For research into the ten-millionth digit of pi, a local tool like y-cruncher or a Python script is faster.

Are the prime numbers actually calculated or pulled from a list?

Calculated. Calculate Prime Numbers runs a Sieve of Eratosthenes in the browser, fast enough for up to 10 million in a few seconds on a modern laptop. The sieve finds about 620,000 primes under 10 million.

Can I paste a column from Excel or a CSV?

Yes. Every tool that accepts lists tolerates tabs, commas, newlines, or spaces as separators. Paste a column directly from Excel, Google Sheets, or a CSV text dump. The tools parse robustly and skip headers or text rows.

Are my numbers sent to a server?

No. Every number tool runs fully client-side, including the arithmetic, the sieve, and the high-precision constant calculations. Safe to paste financial data, test results, or any numeric content.

Number Tools

Number tools cover the integer and decimal work that sits between a simple calculator and a full computer-algebra system. A collection of browser-based utilities for arithmetic, statistical analysis, number-theoretic decomposition, classical sequences, and the digits of mathematical constants.

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All tools in this category

Add Commas to Integer Online - Number Formatting →

Analyze Integers Online and Statistical Analysis →

Calculate Digit Product →

Calculate Digit Sum →

Calculate e-Digits and Euler's Number →

Calculate Fibonacci Numbers →

Calculate Lucas Numbers →

Calculate Number Divisors →

Calculate Number Product →

Calculate Number Sum →

Calculate Phi Digits →

Calculate Pi Digits →

Calculate Prime Factors →

Calculate Sum of Integers →

Calulate Sum Of Digits →

Change Integer Sign →

Change Number Base →

Check Number Palindrome →

Convert Integer to Palindrome →

Convert Integers to Words →

Convert Number to Negadecimal →

Convert Number to Power of Ten →

Convert Number to Power of Two →

Convert Numbers to Image →

Convert Numbers to Words →

Convert Words to Integers →

Convert Words to Numbers →

Create Image from Integers →

Create Integer Array →

Create Integer Zigzag →

Create Number Palindrome →

Create Unicode Fractions →

Decrement Integer Digits →

Decrement Integers →

Delete Integer Digits →

Destroy Integers →

Draw Pascal Triangle →

Enumerate Integers →

Extract Integers from Data →

Filter Numbers →

Find the Greatest Common Divisor (GCD) →

Find the Least Common Multiple (LCM) →

Find the Running Product (Cumulative Product) →

Find the Running Total (Cumulative Sum) →

Fraction Addition Calculator →

Generate Prime Numbers →