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Calcimator

NOTAM Impact Assessment Calculator

Assess flight plan impact from TFRs, runway closures, navaid outages, and altitude restrictions.

Inputs

Results

Impact severity (0-100)

11

Additional time (min)

10

Revised distance (NM)320
Additional fuel (gal)1.7
Additional cost ($)$10.83
Total deviation (NM)20
Alternate fuel (gal)0
Altitude fuel penalty (%)0
How to Use This Calculator
  1. Enter planned route distance (NM), groundspeed (kts), and fuel burn (GPH).
  2. Set detour distance per TFR (NM) and number of airspace deviations required.
  3. Indicate whether the primary destination runway is closed.
  4. Review impact severity score (0–100), additional flight time (min), extra fuel burned, and extra cost ($).
  5. Use the output to decide whether to file an alternate route, delay the flight, or accept the penalty.

How the result changes with Planned distance (NM)

Planned distance (NM)Impact severity (0-100)Additional time (min)
1,000310
3,500110
6,500010
9,000010

What each input means

Planned distance (NM)
Original planned route distance.
Groundspeed (kts)
Expected groundspeed for time/fuel estimates.
Fuel burn (GPH)
Cruise fuel consumption rate.
Deviation per TFR (NM)
Extra distance per TFR or restricted area deviation.
Number of deviations
How many TFRs or restricted areas require routing around.
Primary runway closed (0/1)
1 if the primary runway at destination is NOTAMed closed.
Alternate distance (NM)
Distance to alternate airport if primary runway closed.
Navaid outage (0/1)
1 if a navaid needed for the approach is out of service.
Extra approach time (min)
Additional time for alternate approach procedure.
Altitude restriction (ft)
Max altitude allowed by TFR (0 = no restriction).
Planned cruise alt (ft)
Originally planned cruising altitude.
Fuel price ($/gal)
Cost per gallon for additional fuel cost.

What each result means

Impact severity (0-100)
Overall NOTAM impact score. Higher = more disruptive.
Revised distance (NM)
Total route distance including deviations.
Additional time (min)
Total extra time due to all NOTAM impacts.
Additional fuel (gal)
Total extra fuel required for deviations and alternates.
Additional cost ($)
Dollar cost of the extra fuel.
Total deviation (NM)
Total extra distance from all route deviations.
Alternate fuel (gal)
Extra fuel for diversion to alternate airport.
Altitude fuel penalty (%)
Percentage fuel increase from flying at a lower altitude.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Planned distance (NM) = 300, Groundspeed (kts) = 120, Fuel burn (GPH) = 10, Deviation per TFR (NM) = 20 = 12 input(s) provided
  2. Calculate Impact severity
    Impact severity
    11 = 11
  3. Calculate Additional time
    Additional time = deviationTimeMin + alternateTimeMin + navaidAdditionalMin
    10 = 10
  4. Calculate Revised distance
    Revised distance = plannedDistanceNm + totalDeviationNm
    320 = 320
  5. Calculate Additional fuel
    Additional fuel = deviationFuel + alternateFuel + navaidAdditionalFuel + altitudePenaltyFuel
    1.7 = 1.7

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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