Grey Mouse Studio logo — a hand-drawn grey mouse on a camel circle Grey Mouse Studio
Excel & Google Sheets

Spreadsheets that do the work, not just hold it.

Open it, type your numbers, get an answer. Every workbook here was built for one real job — what a house actually costs, what to set aside for tax, what to charge for a candle — and it does that job on the first try, without a tutorial.

Grey Mouse Studio — handwritten logo with a small grey mouse
Excel 2010+, Excel online & Google Sheets No macros, no security warnings Instant download Printable PDFs where they help
New this week

Most first-time buyers plan for the deposit — then get blindsided by everything else.

The True Cost calculator lists all 27 upfront costs, works out your real cash to close from your own numbers, and shows what's left in your savings the day after you move in. With a scorecard for comparing homes, a printable viewing checklist, and a step-by-step roadmap.

Get the kit — $17
$31,502 Average upfront cost paid by 947 recent US buyers, excluding the down payment — against an average expectation of $8,083. Clever Real Estate / Best Interest Financial survey, January 2026.

Buying a home

What it really costs, and how to tell three houses apart once you've seen all three.

Money & tax

For the jobs where guessing gets expensive, and nobody hands you a form.

Pricing for makers

Your real cost per item, including the hours you keep forgetting to count.

Planners & trackers

The everyday ones. Pay what you want, starting at $2.

Why these are different

Three things I try to get right in every file.

1

Built around one job

Not a blank grid with nice colours. Each workbook answers a specific question, and the answer is on the first tab.

2

Every number is yours

Nothing is hard-coded. Typical ranges are starting points — your state, your lender and your supplier will all be different.

3

Honest about what it is

These are planning tools that produce estimates, not advice. Where a number matters legally or financially, the workbook says so and tells you who to ask.

New templates, occasionally

An email when something genuinely useful ships. No drip sequence, no daily newsletter.