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One Plus One Algebraic Calculator for Palm OS

One+One™ 2.3 Features

Advanced Scientific and Financial Calculator for Palm OS

One Plus One™ is software that turns your Palm OS handheld computer into a full featured standard algebraic scientific and financial calculator. Compute mortgage and loan terms. Take advantage of the many powerful scientific functions. more info...

One Plus One 2.3.4 $9.95
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One Plus One function menu


One Plus One preferences


One Plus One registers

General Features

  • Natural calculator interface
  • Personalizable color keyboard (6 color choices, 2 on a B&W device)
  • IEEE Double precision accuracy (about 16 digits)
  • 15 levels of parentheses
  • Double precision accuracy
  • 25 key keyboard (3 functions per key)
  • Function pop-up on main screen provides access to all built-in functions
  • Graffiti input, copy and paste
  • 16 digit display with SCI, FIX, and ENG formats. Exponents from -308 to 308.
  • Status indicators for shift state, angle mode, and financial annuity mode.
  • Degrees, radians, and grads angle modes
  • Preferences to set the number of digits, angle mode, display format, wordsize
  • Built-in quick reference
  • Extensive documentation


  • 20 global registers (10 are directly accessible via the keyboard)
  • Ability to swap primary and secondary registers.
  • register functions: clreg, clrvars, clx, p<>s, x<>y
  • View registers

Scientific Functions

  • sin, cos, tan, sin-1, cos-1, tan-1, atan2
  • sinh, cosh, tanh, asinh, acosh, atanh
  • ln, lnp1, log, ex, expm1, 10x, yx, x2, sqrt, 1/x
  • int, frac, floor, ceil, abs, mod, chop, pi
  • deg, rad, hours, H.MS, R->P, P->R, seconds

Financial Functions

  • N (number of periods)
  • i (percent interest per period)
  • PMT (payment per period)
  • PV (present value)
  • FV (future value)
  • CLFIN (clear financial registers)
  • Annuity preference (toggle between payments due at the beginning of the period and payments due at the end of the period)
  • View financial registers

Statistics Functions

  • S+ (accumulate statistics)
  • S- (remove data from statistics)
  • mean, std, rand
  • %, % change, N! (factorial)
  • clrstats (clear statistics registers)
  • View statistics registers

Number Base Functions

  • hex, dec, oct, bin
  • modular addition, modular subtraction, modular division, modular multiplication
  • two's complement
  • and, or
  • wordsize preference (up to 48 bits)

Creative Creek, MathU, MathU Pro, RootM and One+One are trademarks of Creative Creek, LLC. All other tradenames and trademarks on the site are of their respective owners.