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SheetBox

From flowchart to spreadsheet!

Build Spreadsheets Visually

SheetBox.ca is a free online calculation platform that transforms interactive flowcharts into clean, color-coded Microsoft Excel (.xlsx) and comma-separated values (.csv) spreadsheets. Traditional spreadsheets often become difficult to audit when complex multi-step formulas are buried inside nested cell coordinates like =(F26*(B26+0.5*E26*E26*$B$8*$E$4))/(F26*(1+$B$7*E26)). SheetBox solves this by letting you design your calculation graph visually—connecting parameters, physical constants, unit conversions, and textbook-style equations on an infinite canvas—while automatically compiling every wire and operation into live Excel cell formulas.

How SheetBox Works in 4 Steps

1. Define Inputs & Parameters

Place Input Blocks onto the canvas for your known variables, physical constants, and design parameters. Assign each variable a mathematical symbol, description, default numerical value, physical unit, and custom Excel cell fill color.

2. Wire Operations & Unit Converters

Connect inputs to Operation Blocks and Unit Converters. Choose from over 50+ built-in physics equations rendered with KaTeX, or author your own custom mathematical expressions using functions like SQRT(), SIN(), COS(), LOG(), LN(), and EXP().

3. Organize Tables with Groups & Sheets

Arrange Input and Output Blocks inside Groups to structure your spreadsheet into titled section tables. Stack blocks vertically to control row order, connect Group Arrow Ports to place tables side-by-side or stacked in Excel, and distribute groups across multiple workbook tabs.

4. Preview, Share & Export to Excel (.xlsx)

Inspect your live spreadsheet in real time using Split View, share password-protected read-only project links with colleagues or students, and export a formatted .xlsx workbook where every output cell contains a genuine, dynamically linked Excel formula.

Explore Interactive Examples & Documentation

New to SheetBox? Browse our complete step-by-step documentation or inspect our three pre-built read-only calculation models:

  • Water Tank Filling Calculation: Computes fluid mass from storage tank volume and water density ($\rho \cdot V$), then chains the result into a mass flow rate operation to determine total tank filling duration in seconds.
  • Newton's Second Law & Mechanical Work: Evaluates net force ($F = m \cdot a$) from inertial mass and acceleration, and calculates total mechanical work performed ($W = F \cdot s \cdot \cos(\theta)$) over a displacement at an angle.
  • Ohm's Law & Circuit Power Dissipation: Determines electric current draw ($I = V / R$) across a resistive load from supply voltage and computes continuous thermal power dissipation ($P = V \cdot I$) in Watts.

View all documentation chapters: 1. Introduction • 2. Starting a New Project • 3. Input Block • 4. Operation Block • 5. Output Block • 6. Unit Converter • 7. Groups • 8. Formula Library • 9. Examples