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TOOL-03 · EXAMPLE TOOL

Connected Calculators

Sizing, loads, materials, pricing: the calculations a business runs every day usually live in separate spreadsheets, so the same inputs get typed again and errors slip in between. Connected Calculators link them. A value entered once flows into every calculation that uses it, and each run is saved with notes and a revision history.

EXAMPLEAn example of the kind of tool I build. Yours is designed around your own rules and data.

FIG. 1

How it works

EXAMPLE DATA

JOB INPUTS

  • JOB-88office · 2,400 sq ft
  • JOB-89warehouse · high ceiling
  • JOB-90inputs incomplete

CALCS — JOB-88

  • load from room dataOK
  • unit sized to loadOK
  • within your design limitsOK
  • price from current ratesOK
  • verdictSAVE REV A

ONE INPUT, EVERY CALCULATION

RECORD

  • REV A · NOTES SAVEDJOB-88
  • OUTSIDE LIMITS · REVIEWJOB-89
  • WAITING FOR INPUTSJOB-90

UNVERIFIED METHODS ARE LABELLED AS SUCH.

SPEC SHEET

DOES
Links your calculations so inputs flow through and every result is recorded.
INPUTS
Your existing spreadsheets and methods.
AI SCOPE
Rarely needed. The math is yours, checked against known results.
FAILS
Safe. Results outside your limits are flagged; unverified methods are labelled.
EXPORTS
A summary sheet for the customer or the job file.
OWNER
You, at handover. Full source and docs.

EXAMPLE SCENARIO

A mechanical contractor sizing equipment for each new job

BEFORE

  • Load, sizing and pricing in three separate spreadsheets
  • Inputs retyped between them, with the occasional typo
  • No record of which version of the numbers was sent

AFTER

  • Job inputs entered once and used by every calculation
  • Results checked against your design limits as you go
  • Every run saved to the job, with notes and what changed

SIGNS YOU NEED THIS

  • Critical math lives in one person's spreadsheet
  • You've sent a number and couldn't later show how you got it
  • Calcs get redone because nobody trusts the old file
  • Analysis takes hours, so alternatives never get tried

USEFUL FOR

  • Engineering & design firms
  • HVAC & mechanical
  • Fabricators
  • Solar & energy installers

START HERE

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