Paint Buying Guide — Gallons, Sheens & Tiers (2026)
The paint aisle punishes guesswork: wrong sheen, short by half a gallon, two batch codes on one wall. This guide is the checklist that buys once.
Quick answer: Buy: gallons = area × coats ÷ 350 (round up); sheen by room (eggshell walls, satin kitchens/baths, flat ceilings, semi-gloss trim); tier by wear (builder $15–25 low-wear, premium $30–45 living spaces, high-end $50–60 color-critical); one batch code per room (5-gal bucket for rooms over 2 gallons).
How much to buy
- Gallons = wall area × coats ÷ 350 sq ft/gal, rounded up
- Primer (when needed): same area ÷ 350, one coat
- Ceilings: flat/ matte ceiling paint, same coverage math
- Trim/doors: expect 1 quart per 2–3 rooms of trim work
- Touch-up reserve: buy one extra quart if within 10% of a whole gallon
Sheen by room
- Ceilings: flat (hides imperfection, doesn't wash)
- Living/hallways/bedrooms: eggshell or matte — washable, low shine
- Kitchens/baths: satin or semi-gloss — moisture and scrub resistance
- Trim/doors: semi-gloss or gloss — durable, cleanable
- Cabinets: cabinet-grade enamel only
The tier spectrum ($15–60/gal)
Builder ($15–25): fine for ceilings and low-wear walls, thinner solids — plan 3 coats on color changes. Premium ($30–45): the sweet spot for living spaces — one-coat coverage over same-sheen, better washability. High-end ($50–60): color-critical and high-abuse walls; the arch-backed colors live here. The painting calculators price all three so the delta is a decision, not a surprise.
Batch codes and can sizes
One wall, one batch code — tint drift between batches shows as a subtle band. Rooms needing 2+ gallons: one 5-gallon bucket beats five singles (cheaper per gallon, perfectly uniform). Keep the batch code and color formula written on the lid for future touch-ups.