MS-DOS ORIGINAL // WEB EMULATION

Big-Calc is a giant calculator with a limit of 16,384 digits. The original 1997 shareware program, reimagined for the browser.

[ RUN BIG-CALC ]
01 // LIVE PROGRAM

The calculator

Click the screen, then use the original keyboard commands—or the on-screen menu.

Big-Calc
Big-Calc Ver 3.00  -  Copyright (c) 1997-2026, Justin White
1234567890.
[ON]   [CE] [7] [8] [9] [+]
[OFF]  [M] [4] [5] [6] [-]

Big-Calc is a shareware program. This means that you may
evaluate this program and make copies for others to evaluate it
without cost. If you decide to keep and use this program please
let me know what you think of Big-Calc.

Justin’s E-mail Address:  

Justin’s Homepage:      https://justinwhite.com
Press any key or click to continue
02

SYSTEM CAPABILITIES

BUILT FOR VERY BIG QUESTIONS

Beyond pocket-calculator arithmetic.

Big-Calc began as an MS-DOS shareware program for calculations that ordinary calculators could not hold. This browser edition keeps the original command-driven interface while running entirely on your device.

  1. 01Add, subtract, multiply, and divide
  2. 02Square and square root
  3. 03Factorials
  4. 04Add a series of numbers
  5. 05Save numbers to disk
  6. 06Printing
  7. 07Ulam’s Conjecture testing
  8. 08Fibonacci sequence
  9. 09Programmability
03

BUILT-IN AUTOMATION

ALT + KEY

Macros included.

Open MACRO inside the calculator or use the Alt-key shortcuts to run the original-style routines.

ALT-HHelp system
ALT-AY root of X
ALT-NDecimal Y root of X
ALT-DDecimal X / Y
ALT-MMersenne primality test
ALT-PPerpetual calendar
ALT-XShow multiplication

ORIGINAL SOFTWARE ARCHIVE

Still calculating after all these years.

The original programs were written for MS-DOS and Windows.

[ JUSTIN’S PAGE ][ CALENDARHOME.COM ]