Rule Four Consulting

Tools

Working calculators, not gated PDFs. Every one is built from the same models we use on client work.

Method

Why you can trust the output

Built from the source model

Each calculator is a re-expression of a spreadsheet model that remains the single source of truth. Changes flow model → engine → test → site.

Parity-tested against the model

No calculator ships unless its output matches the source workbook to within rounding, proven by an automated test that runs on every deploy.

Assumptions stated, not hidden

Every default — working days, on-cost rate, rounding convention — is visible and editable. Substitute your own and the working updates.

Coming next

More tools in build

Salary multiplier · break-even day rate · blended rate and leverage · retainer pricing · UK utilisation on all three denominators. Each is a port of a model already built and tested.

See where your margin is leaking

The Commercial Health Check shows you, in days, where profit is escaping — and exactly what it would take to fix it. Fixed fee, no obligation, and the fastest way to see how we work.

Book a Commercial Health Check Or try the free scorecard