House Painting Cost Interior Calculator

Formatting only. This does not change the calculation.
Surface actually being painted, after deducting openings. Same area unit as the coverage rate.
Total area of everything not being painted.
Number of full coats over the whole area.
Spreading rate published for the product, per coat. Read it off the tin or the manufacturer data sheet.
Charged against the net painted area, not per coat.
Paint needed
10.51 L
Paint Calculator
Paint needed
2.777 US gal
Net paintable area
486.00
Coverage rate used
92.460
Paint cost
262.82
Labour cost
0.00
Total cost
262.82
Worked out from 1 + waste_percent/100 and 4 other sources.
A coverage rate above 20 area units per litre is high for a decorative paint - check the units on the tin.
Coverage rates are published per product and vary with surface porosity, texture and application method; buy from a measured take-off and keep a tin in reserve for touch-ups.

How this is worked out

3 steps
  1. Wall area = 2 x (12 + 15) x 9 = 486 ft2
  2. Coverage 350 ft2/US gal / 3.785411784 L per gallon = 92.46021832535195 ft2/L
  3. Paint = 486 ft2 x 2 coat(s) / 92.46021832535195 ft2 per litre x (1 + 0/100) = 10.51262929728 L

Results are general information, not financial, tax, legal, medical or engineering advice.