Staff Answer
Jul 06, 2026 - 09:04 AM
For pipe, use this formula: diameter in inches × 0.262 = sq ft of surface per foot of pipe, then multiply by the length of the run in feet. Example: 300 ft of 8" pipe = 8 × 0.262 × 300 = about 630 sq ft. Divide your total square footage by the coverage rate. Round up — surface profile and pitted areas absorb more. Send us your dimensions and we'll do the math with you, especially on large runs where 5-gallon pails and volume pricing kick in.
