Eureka Calculator: Is Your Idea Worth Building?
Use this calculator to estimate the financial value of an idea before you commit serious time and money. Enter your assumptions and get an expected annual value, ROI, payback period, and a practical “Eureka Score.”
What is the Eureka Calculator?
The Eureka Calculator is a decision tool for anyone who has more ideas than time. Instead of choosing projects by excitement alone, you can compare ideas with a consistent framework. It translates “this feels promising” into measurable outcomes.
At a minimum, it answers four practical questions:
- How much value could this idea create in a year?
- What is the expected value once risk is included?
- How long would it take to recover the cost?
- Is this a build-now idea or a backlog idea?
How the calculator works
1) Inputs you provide
- Hours saved per week: Time removed through automation, simplification, or better systems.
- People impacted: How many teammates, clients, or users benefit directly.
- Value per hour: Approximate dollar value of one productive hour.
- Implementation cost: Build, tool, training, and rollout cost.
- Success probability: Your confidence that the project works as intended.
- Months to launch: Speed matters—slow projects carry opportunity cost.
2) Core outputs
The calculator estimates:
- Gross annual value: Time savings converted to money over 52 weeks.
- Expected annual value: Gross annual value multiplied by success probability.
- First-year net gain: Expected annual value minus implementation cost.
- ROI: Net gain divided by implementation cost.
- Payback period: How many months until value covers cost.
- Eureka Score: A weighted score for impact, feasibility, and launch speed.
Worked example
Suppose your team spends hours every week creating a recurring report. You estimate the new process saves 2 hours per person per week for 5 people, with labor valued at $40/hour. You think success odds are 70%, rollout takes 2 months, and cost is $5,000.
That idea can generate substantial expected value in year one, often with a short payback period. This is exactly the kind of project that tends to get delayed when teams rely on intuition alone. With numbers visible, prioritization becomes easier and less emotional.
How to make better assumptions
Use conservative estimates first
Start with realistic-to-conservative values. If a project still looks great under conservative assumptions, it is usually robust enough to move forward.
Run three scenarios
- Base case: Most likely assumptions.
- Downside case: Lower adoption, lower time savings, higher cost.
- Upside case: Faster adoption and broader impact.
Review assumptions after launch
After 30–60 days, compare projected versus actual results. This builds calibration, so your next forecast is better and your confidence intervals tighten over time.
Decision rules you can use immediately
- Prioritize ideas with high Eureka Score and payback under 12 months.
- Delay ideas with good impact but very low feasibility until key risks are reduced.
- Kill ideas with weak expected value unless they unlock strategic capabilities.
- Revisit backlog projects quarterly with updated assumptions.
Common mistakes to avoid
- Ignoring adoption friction: Savings only happen if people actually use the new process.
- Undervaluing change management: Training and support are part of implementation cost.
- Using one giant estimate: Break big initiatives into phases with milestone checkpoints.
- Forgetting strategic value: Some projects are worth doing even before direct ROI appears.
Final takeaway
A strong idea becomes a great decision when you add clear assumptions, expected value, and execution speed. The Eureka Calculator is a simple way to do that. Use it to compare options, prioritize faster, and direct your effort toward ideas that create measurable impact.