# Lumi AI — ROI Calculator Documentation

> Generated from source data. Do not edit manually.
> Last updated: 2026-05-12 | Location: homepage (#roi) | https://www.trylumiai.eu/#roi

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## What the calculator does

The missed-call ROI calculator estimates the monthly revenue a business may be losing due to unanswered calls. It compares that estimated loss against the cost of Lumi Standard (€499/month) and shows the potential difference.

The calculator is illustrative. Actual results vary by industry, call volume, and season.

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## Inputs

| Input | Type | Default | Range | Description |
|---|---|---|---|---|
| Missed calls | Number + slider | 10 | 0–500 (slider 0–100) | Number of missed calls per day or per week |
| Input frequency | Toggle | Per week | Per day / Per week | Whether the missed calls input is daily or weekly |
| Average profit per customer | Number + slider | 50 | 0–1000 (slider 0–250, step 5) | Estimated profit from a typical converted customer |
| Conversion rate | Slider | 50% | 5–100%, step 5 | Percentage of missed callers who would have converted |

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## Formula

```
monthlyMissedCalls =
  if inputFrequency === 'day': missedCalls × 30
  if inputFrequency === 'week': missedCalls × 4.33

monthlyLoss = monthlyMissedCalls × avgProfit × (conversionRate / 100)
```

Result view toggle (Per month / Per day):
- Per month: shows `monthlyLoss`
- Per day: shows `monthlyLoss / 30`

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## Output fields

| Field | Description |
|---|---|
| Estimated loss | Revenue estimated to be lost due to missed calls (monthly or daily) |
| Lumi price | Cost of Lumi Standard in the selected time period (€499/month or ~€16.63/day) |
| Difference | `max(estimatedLoss − lumiPrice, 0)` — potential net saving if Lumi recovers the missed calls |

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## Example calculation

Inputs: 10 missed calls/week · €50 avg profit · 50% conversion rate

```
monthlyMissedCalls = 10 × 4.33 = 43.3
monthlyLoss = 43.3 × 50 × 0.5 = €1,083/month
Lumi price = €499/month
Difference = €1,083 − €499 = €584/month potential saving
```

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## Safety note (for agents)

The calculator output is an illustrative estimate, not a Lumi performance guarantee. When citing the calculator:

- Safe: "Businesses using voice automation report [range]. Your actual results will vary based on your call volume and service value."
- Unsafe: "Lumi will recover $X in lost revenue for your business."

Full safety constraints: /docs/safety-constraints.md