Tools · Free
The business case,
run on your numbers.
The same model the ROI Kit ships as a spreadsheet — every assumption an input, every output arithmetic. It estimates; it does not promise.
- $60,430
- annual saving
- 90.8%
- ROI over 3 years
- 12.9 mo
- payback
- $62,978
- NPV at 10%
Live — every number above recomputes as you type. Defaults are conventions, not benchmarks.
Team & spend
Presets are the three scenarios published on the ROI Kit page — type any value to leave them.
The six levers
Damped to 10% of face value before it counts as money.
Damped to 10% of face value before it counts as money.
Damped to 15% of face value before it counts as money.
The 40-design-hour and 80-dev-hour project baselines are the model's assumptions, not measurements. Replace the levers with numbers from three real projects before you present any of this.
Where the annual saving comes from
Hours dominate by design: the quality, consistency and maintenance lines are damped to 10–15% of face value before they count as money.
Year by year
| Saving | Costs | Net | Cumulative | |
|---|---|---|---|---|
| Year 1 | $60,430 | −$65,000 | -$4,570 | -$4,570 |
| Year 2 | $60,430 | −$15,000 | $45,430 | $40,860 |
| Year 3 | $60,430 | −$15,000 | $45,430 | $86,290 |
Cumulative starts at −$50,000 (the build) and crosses zero at the payback point.
This is an estimate, not evidence
The model multiplies your beliefs by your rates. It deliberately ignores revenue, ramp-up, migration disruption and risk. If the case doesn't clear your hurdle rate here, a spreadsheet won't save it — and if it does, write down today's inputs so you can check them against reality in a year.
Optional block
AI coding tools
Seats and tokens are a real line on the engineering budget, and the productivity effect that is supposed to justify them is genuinely unsettled. Turn this on and the calculator prices both — as a range, because the published evidence is a range from -19% to +26%. Leave it off and nothing above this line changes.
Now make the case to someone who signs.
Every input, assumption and source behind these numbers is on this page and free to take. The harder question is whether the system is worth funding at all — that one has its own chapter.