Home Improvement Calculators

Material and cost calculators for DIY homeowners and landscapers. Accurately calculate patio pavers & gravel base, appliance electricity costs, mulch and gravel volumes, interior paint coverage, and lawn fertilizer application rates.

Paint Coverage

Calculate gallons of paint needed based on wall dimensions and door/window exclusions.

Room Dimensions

Length (ft)

Width (ft)

Height (ft)

Doors (deduct 20 sq ft)

Windows (deduct 15 sq ft)

Number of Coats

Paint Required

Recommended Purchase

2 Gal + 2 Qt

Covers 796 sq ft total (2 coats)

Wall Surface Area

398 sq ft

Single coat net area

Theoretical Gallons

2.27

At 350 sq ft/gal

Rule of Thumb: Purchasing a rounded-up full gallon is usually cheaper and more consistent than buying multiple single quarts.