RPN Calc Pro

RPN Calc Pro brings the power of Reverse Polish Notation to Android — the same calculation method used by HP calculators trusted by engineers, scientists, and mathematicians for decades.

If you already know RPN, you know why it's faster. If you're new to it, you'll wonder how you ever worked without it.

No ads. No subscriptions. No internet required. Pay once, own it forever.

FEATURES

- 4-level RPN stack (T, Z, Y, X registers)
- Full scientific function set: SIN, COS, TAN, ASIN, ACOS, ATAN
- Logarithms: LN, LOG, eˣ, 10ˣ
- Power functions: yˣ, x√y, x², √x, 1/x
- Factorial (n!) and combinations (nCr)
- Constants: π and e
- DEG / RAD angle mode
- Degree ↔ Radian conversion
- Last X register for error recovery
- Memory register with STO, STO+, RCL, MCLR
- 2nd function system for quick access to 18 additional functions
- Scientific notation entry (EE)
- Smart number formatting

DESIGNED FOR PROFESSIONALS

Clean, distraction-free interface built for people who use their calculator seriously. No ads, no subscriptions, no internet connection required. Your calculations stay on your device.

Built by SparkStream LLC.