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THE FEUTEX TOOLKIT

Service Retainer Capacity and Overage

Allocate included service hours and calculate overage billing and effective hourly receipts.

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01 Your input
02 Your result
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FormulaOverage hours = Math.max(0,v.actual-v.included) ; Invoice = v.retainer+Math.max(0,v.actual-v.included)*v.overage_rate ; Effective rate = (v.retainer+Math.max(0,v.actual-v.included)*v.overage_rate)/v.actual
Sources and model references

Worked example

Inputs

Retainer
5000 currency
Included
50 hours
Actual
65 hours
Overage rate
120 currency/hour

Expected results

Overage hours
15 hours
Invoice
6800 currency
Effective rate
104.6153846 currency/hour

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter your own assumptions using a consistent currency and period.
  2. Review the scenario outputs and compare alternative inputs.
  3. Check the stated model limits before using the result in an operating plan.

Try this example

{
  "retainer": 5000,
  "included": 50,
  "actual": 65,
  "overage_rate": 120
}

Accuracy and scope

Deterministic planning scenario; inputs are assumptions, not forecasts. Excludes taxes, financing, legal requirements and costs not explicitly entered. Source explains the underlying planning framework; this specific scenario arithmetic is original.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.