Micro Tools

A question.
A calculation.
The working shown.

Start with the question you were asked. Each tool does a specific job, with the calculation and its assumptions there to inspect.

11 focused calculations. Calculations stay in your browser. Saving is optional. No account required to use the tools.

Why did the number move?

A total everyone can see, and a movement nobody can yet explain. Each of these splits the movement into named drivers and shows the arithmetic behind every one.

Where is cash tied up?

The profit is there and the cash is not. This turns a change in the days you collect, hold and pay into the cash it would release.

Is this project worth doing?

One figure rarely settles it. These judge a project on its return, and on how much of that return survives the range of things that could happen.

Can I trust this forecast, or this model?

Before you present a figure, know how the last one behaved and how the workbook behind it is built.

Personal finance

Planning for your own money, with the assumptions in view.

Feedback

Save this analysis

We will store the name and this tool’s supported calculation inputs, assumptions, labels, currency and number format, plus its identifier, save dates and your account ID. Outputs are recalculated when you open it.

Chart export styling, materiality filters, monthly review datasets and connected supporting analyses are not included in account saves.

No source workbook or chart file is uploaded. Your inputs stay in the browser until you sign in and confirm saving. A temporary draft stays in this tab for up to 30 minutes while you sign in.

Saved inputs are stored on Cloudflare in Western Europe until you delete them or your account. Deleted data may remain in restricted, encrypted backups in Asia-Pacific until their 30-day expiry. A separate encrypted recovery log keeps record IDs, protected email fingerprints and deletion or unsubscribe times for 35 days so a restore does not bring deleted data back. It contains no financial inputs. Expiry runs automatically and may not remove records at the exact deadline.