Modes

Standard

A 5-column algebraic calculator for everyday arithmetic. Supports parentheses, percentage, and standard operator precedence.

Conversion

Unit conversion across 12 categories: Area, Data, Energy, Force, Length, Power, Pressure, Speed, Temperature, Time, Volume, and Weight.

Tap the category label to switch categories. Tap either unit label to open a selector grid. Both the From and To fields accept direct input — editing either field recalculates the other automatically.

Financial (RPN)

An RPN financial calculator modeled on HP 12C conventions.

TVM: Solve for any of n, i, PV, PMT, or FV by entering four known values and tapping the unknown
Amortization: Enter the number of periods in X, press AMORT to compute principal, interest, and remaining balance
Cash Flows / NPV / IRR: Use g + PV for CFo, g + PMT for CFj, f + PV for NPV, f + PMT for IRR
f + [0-9]: Set decimal display precision

Scientific

A 7-column algebraic calculator.

Trigonometry: sin, cos, tan and inverses asin, acos, atan
Hyperbolic trigonometry: sinh, cosh, tanh
Logarithms: ln, log (base 10), log2
Exponentials: e^x, 10^x, x^y
Powers and roots: x², x³, square root, cube root, y-th root
Other: factorial, mod (infix operator), 1/x, absolute value, random
Constants: pi, e
Memory: MC, MR, M-, M+
DEG/RAD toggle; scientific notation entry via EE
Implicit multiplication is supported: 2pi, 3sin(30), and 4(2+1) are all valid expressions

Bottom Bar Controls

Present in all modes:

Hist navigation (back/forward): Browse previously evaluated expressions (Standard and Scientific)
Decimal places (- / +): Adjust the number of decimal places shown, from 0 to 8
,000: Toggle thousands separator on or off
Result Only / Full Record: Controls what is stamped into the note
Insert: Stamps the current result into the note page at the cursor position

Stamp Modes

Result Only stamps the numeric result, or the conversion pair in Conversion mode.

Full Record stamps:

Standard / Scientific: the full expression and result
Financial TVM: all register values (n, i, PV, PMT, FV)
Financial IRR / NPV: the full cash flow schedule and result
Financial Amortization: periods, principal, interest, and remaining balance
Conversion: category name, from value and unit, to value and unit

Smart placement detects the lowest existing element on the page and inserts below it.

Installation

Download SnCalc.snplg from the latest release.

https://github.com/taoist22/sn-calc/releases/tag/v2.1.0-beta

Connect your Supernote to your computer.
Copy SnCalc.snplg into the MyStyle folder on your device.
On your Supernote, go to Toolbar Plugins icon > Manage Plugins > Add Plugin and select SnCalc.snplg.
Open a note, tap the plugin icon in the toolbar, and select SnCalc Pro.

Usage Notes

This is a beta release. Verify critical results independently.
Financial mode uses RPN (Reverse Polish Notation). Values are pushed onto a 4-register stack (X, Y, Z, T).
The DEG/RAD indicator appears in the top-left of the Scientific display.
The memory indicator (M) appears in the display when the memory register holds a non-zero value.

https://reddit.com/link/1t4xlp6/video/4x215thpxezg1/player

Update to the Calculator plugin:
Added Financial calculator and Scientific calculator modes

These new function have been *lightly* tested. Please let me know if you have issues or suggestions!

Three Modes

Standard: A familiar algebraic calculator for quick daily tasks, featuring an ergonomic 5-column layout with percentage support.
Financial (HP 12C Logic): A full-featured RPN financial engine. Calculate TVM (Time Value of Money), Amortization (Principal/Interest breakdown), IRR (Internal Rate of Return), and NPV (Net Present Value).
Scientific: A dense 7-column algebraic grid featuring over 50 functions, including hyperbolic trigonometry, logarithms (ln, log10, log2), powers, roots (including custom root solvers), and scientific notation.

Smart Audit Trails

"Full Record" Stamps: Beyond just results, SnCalc Pro can stamp detailed reports into your notes.
- Amortization: Stamps a formatted block showing periods, principal paid, interest paid, and remaining balance.
- Cash Flows: Stamps your entire investment schedule (CF0, CFj, Nj) alongside the IRR/NPV results.
- Scientific: Stamps the full algebraic expression and the result.
Smart Placement: Automatically detects the lowest element on your page and places the stamp below your handwriting, ensuring no overlaps.

High-Precision Engine

Deterministic Math: Uses a custom recursive descent parser for algebraic expressions and the Newton-Raphson method for financial roots.

u/tao22

Updates to SnCalc - calculator plugin