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About this app

This is an arbitrary precision calculator that performs calculations on your smartphone that even standard calculators, built-in mobile calculators, and Excel have given up on.

■ Calculations like these are possible

• 2^1000000 — Accurate result of 301,030 digits to the last digit

• 100000! — Instantly calculate a 456,574-digit factorial using a multiplication tree algorithm

• 0.1 + 0.2 = 0.3 — Accurate decimal calculation without floating-point error

• 1÷3, √2, π — Up to 100,000 decimal places

• Arithmetic operations, exponents (^), factorials (!), square roots (√), modulo (mod), parentheses

■ Why is it different?

Standard calculators use 64-bit floating-point numbers and are accurate only up to about 15 to 17 digits. Because this app handles numbers directly without digit limits, much like large integers in Python, it can calculate up to approximately 200 million digits (up to the device memory limit).

■ 100% Offline · No Privacy

• No internet permissions required — all calculations run exclusively on the device

• No data collection, transmission, or advertisements

• Works perfectly even in Airplane Mode

■ Convenience Features

• Preview of extra-large results by 10,000 digits + save as a TXT file (download folder)

• Automatic saving of calculation history, thousands separator comma, copy results

• Background calculations keep the screen from freezing, and cancellation is possible during progress

Use it for every moment you need large numbers—checking math homework, learning cryptography, combinatorics (nCr · factorials), programming verification, and even pure curiosity like "How many digits is 2 to the power of 1 million?"

Web Version: https://programmers.pe.kr/calculator/

What’s new

First release.
- Calculations ordinary calculators give up on: 2^1000000, 100000!, √2 and π to 100,000 decimal places
- Results up to ~200 million digits (device memory permitting); huge results get preview + TXT export
- 100% on-device: no internet permission, nothing sent to servers, works in airplane mode
- History, digit grouping, and copy support