Spreadsheets and data

Free Spreadsheet Sensitivity Analysis Generator.

What-if table structure and deterministic recalculation instructions.

Explore how supplied assumptions affect a model and keep the calculation rules visible alongside the comparison.

Chrome extension + account required.
25 free automation tasks/month across tools. Browser-provider limits apply.

WHAT TO HAVE READY

Model inputs, output formula and scenario ranges.

YOUR STARTING POINT

A task you can make yours.

Copy it here. Paste it into WebAct when you are ready.

This page prepares your prompt. The task runs in WebAct.

01

Make the task yours.

Review the prompt above. Add your goal and any requirements that matter.

02

Bring it to WebAct.

Open WebAct, paste the task and provide your source material. Start in Chat for a draft or explanation; use Task when you want an approved browser action or file.

03

Check the useful part.

Check formulas, code and calculations against known inputs in the appropriate runtime. Review actions before execution and keep the original data available.

A PRACTICAL GUIDE

How to use the Spreadsheet Sensitivity Analysis Generator.

Sensitivity analysis changes selected assumptions while holding the rest of the model consistent. Define the output formula and plausible ranges before building scenarios.

Make the workflow fit your task.

Define the model, baseline inputs and outcome first. Change one input at a time for a simple sensitivity table, keeping other assumptions fixed. Show units, tested ranges and calculated results; use separate scenarios when several assumptions change together.

What you provide
Model inputs, output formula and scenario ranges.
What you get
What-if table structure and deterministic recalculation instructions.

See the input and the result.

Illustrative input and output · a teaching example, not a live WebAct run

Example input

Profit equals price minus $25 cost; test prices $35, $40 and $45.

Completed example

Scenario profits: $10, $15 and $20 per unit, assuming the same supplied unit cost.
Download this example

Load this input into the prompt, then copy it to WebAct to try the task. Your result may differ from the illustration.

Decisions and troubleshooting.

Does sensitivity analysis predict which future outcome will happen?

It shows how the model responds to assumed inputs. It does not establish probabilities or forecast accuracy.

Why do several inputs appear to change in a one-variable analysis?

Check linked formulas and dependent assumptions. State whether those relationships are part of the model or should be held fixed.

Try it with your own source.

Replace the example with your material in the task prompt. Keep the requirements you need, then copy the task into WebAct.

Customize and copy the task ↑
BEFORE YOU BEGIN

Using WebAct.

The prompt and example are available here. Run your task in the WebAct Chrome extension.

Is this tool free?

You can copy and edit the prompt here for free. To use it with WebAct, install the Chrome extension, create and verify your account, and connect an available browser ChatGPT session. The Free plan includes 25 user-started automation tasks per calendar month, shared across tools. Ordinary browser Chat is separate; provider limits apply.

Learn about shared context in our privacy policy and choosing Chat or Task.

FROM A PROMPT TO YOUR OWN WORK

Bring the task to your page.

Install WebAct, add your source material and make the result yours.

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