What Am I Forgetting?
Before any major decision, see the hidden factors everyone forgets — maintenance, taxes, opportunity cost, and more.
Enter Your Values
Using shared profile · 3,500/mo · EUR — edit on Dashboard
Results update automatically as you change values.
What-If Scenarios
Results update instantlyCost Breakdown
Hidden Cost Factors
Click chart to expand
Scenario Analysis
How the outcome shifts if your assumptions turn out better or worse than expected.
Best-case outcome with favorable assumptions.
Most likely outcome based on your inputs.
Conservative outcome with cautious assumptions.
Compare Scenarios
Pin up to 3 and see them side by sideSet your inputs, then Pin current to save this scenario. Pin a few variations to compare their scores and outcomes here.
Confidence & Assumptions
The outcome is fairly stable across best and worst cases — this is a robust decision.
Hidden Factors Found: 7 (worst) → 7 (expected) → 7 (best)
These are the estimates the result depends on. Adjust them (and the Advanced inputs) to match your real situation — the closer they are to reality, the more reliable your decision.
These estimates are for informational purposes only and do not constitute financial advice. Actual results may vary based on factors not captured in this calculator.
How This Calculator Works
What this calculator does
TrendMandi's signature feature — surfaces hidden costs and forgotten factors before any major decision.
How the calculation works
Generates a checklist of commonly overlooked costs specific to your decision type with estimated amounts.
Formula
True Cost = Stated Price + Σ(Hidden Factors)
Example
Buying a house for €300,000? Add maintenance, taxes, insurance, renovation, interest, and transaction costs.
How to Use This Calculator
- 1Enter your numbers
Fill in the inputs for What Am I Forgetting?. Defaults are realistic starting points — replace them with your actual figures.
- 2Understand the calculation
Generates a checklist of commonly overlooked costs specific to your decision type with estimated amounts.
- 3Review results and scenarios
Check metrics, cost breakdown, comparison tables, and best / expected / worst scenarios. Use sliders to stress-test assumptions.
- 4Decide with the verdict
Read the decision engine recommendation and FAQ. Example: Buying a house for €300,000? Add maintenance, taxes, insurance, renovation, interest, and transaction costs.
Factors to Consider
- Different decisions have different blind spots
- Use alongside specific calculators
- Estimated costs vary by location
Common Mistakes
- Assuming sticker price is total cost
- Skipping due diligence on hidden factors
Frequently Asked Questions
Why is this a signature feature?+
Most people decide on sticker price alone. This tool forces you to consider what you are forgetting before committing.
This calculator provides estimates for informational purposes only and does not constitute financial, investment, tax, or legal advice. Always consult a qualified professional before making important financial decisions.
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