Funding Envelope Calculator
A defensible ±30–40% cost estimate at Stage 6 — before any SI is on board. Set the programme parameters below; the calculator applies Keystone's role-mix percentages and blended day-rates to produce an envelope range suitable for Board Gate 1.
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Auto-set by size. Override if your programme differs.
Shifts effort between Functional Consultants and Developers.
Cost breakdown by role group
| Role group | Effort % | Effort (days) | Rate tier | Day rate | Cost |
|---|
Headcount sanity-check
| Role group | Effort (days) | Duration (months) | Working days | Implied FTE |
|---|
Headcount is indicative. Some roles (e.g. 1 Business Architect per workstream, 1 SI Functional Lead per workstream) are fixed-per-workstream in practice and don't scale linearly with programme size. The implied FTE above is a mathematical derivation from effort days ÷ available working days. For the canonical sizing pattern — which roles multiply at which programme size — see the Roles tab on the Testing Command Centre and the programme sizing table on the Roles page.
Rates published May 2026, reviewed periodically. Derived from IT Jobs Watch UK contract median day-rates for Programme Manager, Solution Architect, Functional Consultant and Developer roles, cross-referenced with Hays Salary Guide and Free-Work, and adjusted for senior D365 programme delivery context based on practitioner experience.
How this estimate is constructed: see the Funding Envelope estimation method page for the full worked example and the logic behind the role-mix percentages.