SheetSage Design

Know your real numbers.

Spreadsheets and template kits that do the arithmetic you have been doing in your head — profit after every fee, what you can safely spend this month, which claim runs out of appeal time on Friday.

✓ Instant digital download ✓ Google Sheets & Excel ✓ Every formula independently verified ✓ No subscription

Find your shelf

Four kinds of work, 17 tools.

Featured templates

All 17 on sale now — buy here, download straight away.

See all 17 templates →

Read before you buy

Every template has a full-length guide behind it. The guides are free and answer the question on their own — the spreadsheet just stops you doing it by hand.

All 11 guides →

How we build these

Every workbook is rebuilt from source and then checked against an independent calculation of the same numbers, written separately from the build code. Deliberate faults are introduced on purpose to confirm the checks would catch them. Sample data is real sample data — the figures in our screenshots come out of the file you receive. Fee rates and tax percentages are editable cells, never hard-coded, because they change.

Designed by us and built with the assistance of AI tools, then reviewed and verified by hand before anything goes on sale.