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Coatings Coverage Calculator

Calculate how much coating you need to cover your job's square footage with MIL-DTL-24441, MIL-PRF-24635, MIL-DTL-24607, TT-P-645B, or TPD-1000A.

These are theoretical values. Please review "How much I should buy?" to adjust for your job.

Spec Type Dry mil
thickness
Theoretical
coverage
per gallon
  # of coats   Theoretical
full coverage
24441 Type III (3 coats) 3 mils 360 ft² ÷ 3 = 120 ft² per gallon
Type IV (2 coats) 5 mils 230 ft² ÷ 2 = 115 ft² per gallon
24635 Type II (340 g/L) 2 mils 480 ft² ÷ 2 = 240 ft² per gallon
Type III (250 g/L) 2 mils 480 ft² ÷ 2 = 240 ft² per gallon
24607 n/a 2 mils 480 ft² ÷ 2 = 240 ft² per gallon
TT-P-645B n/a 3 mils 375 ft² ÷ 1 = 375 ft² per gallon
TPD-1000A n/a 1 mil 910 ft² ÷ 2 = 455 ft² per gallon


How much should I buy?

Take the theoretical calculation above, and adjust for these factors.

  • mil thickness -- The thicker you apply, the more you'll need.
  • condition of surface -- Rougher surfaces require more coating.
  • application method -- Brushing and rolling require more coating than spraying.
  • overage -- Consider touch-up, waste, and difficult to measure surfaces.

Taking these factors into account, you may need 10-25% more than the theoretical full coverage.