R47 Scientific Calculator
The R47 is a powerful, RPN-based programmable scientific calculator with an extensive feature set. Its software has been refined over many years, born from the vision of a dream calculator developed by a team of engineers and mathematicians, all dedicated calculator enthusiasts.
Community-developed and manufactured by SwissMicros, the R47 runs firmware that is functionally identical to that of the C47, which offers a way to transform a DM42n into a feature-rich RPN calculator using a dedicated keypad overlay.
The C47/R47 firmware originated as a fork of the WP43 project, itself derived from the WP34S. A core component carried through this lineage is the decNumber library by Mike Cowlishaw for precise decimal arithmetic.
I understand that the R47 firmware is not written, distributed, or maintained by SwissMicros, and I agree that any support for the R47 firmware will be requested and handled by the R47 team via email to support@47calc.com. Please see the documentation at https://47calc.com/
The software (firmware) is currently in beta.
R47 Scientific Calculator calculator features
- Solve equations and systems of equations
- Perform numeric definite integration and derivatives
- Matrix and vector operations including eigenvectors, generalized norms, and specialized support for 2-space and 3-space operations
- Work with complex numbers which utilize unambiguous notation and are supported for virtually all operations
- Base-n arithmetic with extensive bitwise logical operators
- Provides 34 digits of precision; exponents to ±6144; up to 1000 named variables
- Include scientific functions such as trigonometric, hyperbolic, logarithmic, and exponential functions, plus advanced special functions.
- Support advanced functions including Bessel, Riemann zeta, Beta, and related functions, with broad support over the complex plane.
- Feature extensive statistics, including 2-variable statistics, best-fit modelling, a large set of distributions and their inverses, and basic plotting.
- Create programs using a multi-line editor.
- Be keystroke programmable with tests, flags, looping, and branching.
- Conduct financial and date-based calculations, including time value of money operations.
- Apply built-in unit conversions and a library of constants.
- Perform date and time math, as well as built-in clock functions.
- Include an equation writer with support for solving, numeric integration, derivatives, and basic plotting.
- Support factoring and other operations on 1000-digit integers.
- Include built-in electrical engineering applications, such as three-phase calculations.
- Feature 8 stack levels, 3 rows of menus, and an always-on status bar.
- Offer user-customizable keyboard and softkey-based menus.
- Restore states, programs, and configuration via USB-C.
- Maintain backwards compatibility with HP-41 and HP-42 workflows.
R47 Scientific Calculator hardware features
- A USB-C connector for complete and easy calculator contents backup
- Sleek and sturdy hardware based on a stainless steel shell
- Fast STM32U5 CPU
- Single coin-cell operation
- Low power - long battery life
- Image Converter
Convert images for use with SwissMicros calculators DM32/DM42/DM41X
- Browser-based R47
An interactive browser-based reference for the R47 calculator
- Translate RPN Programs incl. R47
Convert RPN programs
| Aspect | Details |
|---|---|
| Construction | Case made from stainless steel, matte black Physical Vapour Deposition (PVD) coated and laser engraved |
| Software | Custom calculator implementation running on SwissMicros DMCP operating system |
| Processor | Ultra-low-power ARM® Cortex-M33®, at max. 160 MHz |
| Flash memory | 64 MBit additional flash |
| Floating Point Standard | decNumber library by Mike Cowlishaw |
| Display type | Monochromatic ultra-high contrast (14:1) transflective memory LCD display |
| Display resolution | 400 × 240 pixels |
| Display active area | 58.8 × 35.28 mm |
| Display dot pitch | 147 µm × 147 µm |
| Connectivity | USB-C, connects as USB mass storage device |
| Battery type | 1 × CR2032 3V lithium coin cell |
| Size | 77 mm × 144 mm × 12 mm |
| Weight | 205 g |
| Warranty | 5 years |
