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Calcimator

Maintenance Float Calculator

Equipment float sizing from readiness rate and repair time.

Inputs

%

Results

Float required

5

Avg in maintenance4.67
Achieved OR (%)100
Monthly repairs10
Monthly parts demand50
Deficit From Target10
How to Use This Calculator
  1. Enter the total equipment count in the fleet.
  2. Set the target operational readiness (OR) rate (%) — typically 90% for combat units.
  3. Input average repair time (days) and monthly failure rate as a fraction (e.g., 0.10 = 10% of fleet fails per month).
  4. Review Float required — the number of spare equipment items needed in the float pool.
  5. Check Achieved OR (%) to verify the float provides the target readiness, and Monthly repairs for maintenance staffing.

How the result changes with Total equipment

Total equipmentFloat required
1,00147
3,501164
6,500304
9,000420

What each input means

Total equipment
Total equipment items in the fleet.
Target OR rate (%)
Target operational readiness rate.
Avg repair time (days)
Average days to complete a repair.
Monthly failure rate
Fraction of equipment failing per month.

What each result means

Float required
Spare equipment items needed as float.
Avg in maintenance
Average items in maintenance at any time.
Achieved OR (%)
Operational readiness with float.
Monthly repairs
Expected repair actions per month.
Monthly parts demand
Estimated repair parts needed per month.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total equipment = 100, Target OR rate (%) = 90, Avg repair time (days) = 14, Monthly failure rate = 0.1 = 4 input(s) provided
  2. Calculate Float required
    Float required = ceil(inMaintenanceCount)
    5 = 5
  3. Calculate Avg in maintenance
    Avg in maintenance = round(inMaintenanceCount * 100) / 100
    4.67 = 4.67
  4. Calculate Achieved OR
    Achieved OR = round((min(totalEquipment, availableWithFloat) / totalEquipment) * 10000) / 100
    100 = 100

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