# Home Paint Calculator

Home paint calculator for interior and exterior home paint calculator projects. Also works as a Home Depot paint calculator. Enter home size and finish for gallons and cost.

## What this calculates

Home painting costs range from a few hundred dollars for a DIY single-room refresh up to $25,000 or more for a pro-painted whole-house job with premium paint. This home paint calculator figures out wall area (interior) or siding area (exterior) from your home size and stories, tells you how many gallons to buy, and estimates total paint plus pro labor so you can budget with confidence.

## Inputs

- **Project Type** — options: Interior (walls), Exterior (siding), Both (whole home)
- **Home Size** (sq ft) — min 300 — Living square footage of the home
- **Average Ceiling Height** (ft) — min 7, max 14 — 8 ft standard; 9-10 ft for newer builds, taller for vaulted
- **Home Stories** — options: 1 story (ranch), 1.5 stories, 2 stories, 3 stories — Affects exterior paint calculations and scaffolding labor
- **Paint Quality** — options: Economy ($25/gal - Home Depot Glidden), Standard ($45/gal - Behr Premium Plus), Premium ($70/gal - Sherwin Duration, Benjamin Moore)
- **Number of Coats** — min 1, max 4 — 2 is standard; add primer coat if changing colors dramatically
- **Labor** — options: DIY (no labor cost), Pro - Basic ($1.75/sq ft combined avg), Pro - Standard ($2.75/sq ft), Pro - Premium ($4.00/sq ft)

## Outputs

- **Interior Wall Area** (sq ft)
- **Exterior Siding Area** (sq ft)
- **Total Paint Gallons**
- **Paint Cost** — formatted as currency
- **Labor Cost** — formatted as currency
- **Total Home Paint Cost** — formatted as currency

## Details

## How the Home Paint Calculator Works

The calculator starts with your home's living square footage and multiplies by standard factors to estimate paint-able area:

- **Interior:** home sq ft x (ceiling height / 8) x 3.0 for wall area
- **Exterior:** footprint x 2.5 x stories for siding area

It then divides by the coverage rate (350 sq ft/gal interior, 275 sq ft/gal exterior) and multiplies by the number of coats.

## Home Depot Paint Calculator Equivalent

Home Depot sells Behr Premium Plus at roughly $45 per gallon and Glidden at $25 per gallon. A typical Home Depot paint calculator for a 2,000 sq ft interior (walls only, 2 coats, standard paint) outputs about:

- Wall area: 6,000 sq ft
- Gallons needed: 35
- Paint cost: $1,575
- Add labor for pro: $16,500 (at $2.75/sq ft)
- **Total: $1,575 DIY materials, $18,000 pro standard**

Home Depot free in-store paint color matching is spot-on, and their 1-gallon, 2-gallon, and 5-gallon buckets all ring at the same per-gallon price. Buying 5-gallon buckets saves 10-15 percent over individual gallons for jobs of 10+ gallons.

## Exterior Home Paint Calculator

An exterior home paint calculator uses a different coverage rate (275 sq ft/gal vs 350 for interior) because siding is rougher and more porous than drywall. For a 2,000 sq ft single-story home:

- Footprint: 2,000 sq ft
- Siding area: 2,000 x 2.5 = 5,000 sq ft
- Gallons: (5,000 x 2) / 275 = 37 gallons
- Paint cost (standard): $1,665
- Pro labor: $13,750-20,000 (scaffolding for multi-story adds 10 percent per extra floor)
- **Total: $15,000-22,000 pro standard**

Two-story homes cost 10-15 percent more than single-story for exterior paint because of scaffolding, ladders, and slower production rate on upper floors.

## Cost by Home Size

| Home Size | Interior DIY | Interior Pro | Exterior Pro |
|-----------|--------------|--------------|--------------|
| 1,200 sq ft | $450-600 | $7,500-11,500 | $6,000-10,000 |
| 1,500 sq ft | $600-800 | $9,500-14,500 | $7,500-12,500 |
| 2,000 sq ft | $800-1,100 | $12,500-19,000 | $10,000-16,500 |
| 2,500 sq ft | $1,000-1,400 | $15,500-23,500 | $12,500-20,500 |
| 3,000 sq ft | $1,200-1,700 | $18,500-28,500 | $15,000-24,500 |

## Paint Quality - What Actually Matters

- **Economy ($25/gal):** Glidden or equivalent builder-grade. Needs 3 coats often. 5-7 year lifespan on walls, 4-6 on siding.
- **Standard ($45/gal):** Behr Premium Plus, Valspar Signature. 2 coats solid, 7-10 year lifespan interior, 6-8 exterior.
- **Premium ($70/gal):** Sherwin-Williams Duration, Benjamin Moore Aura. 1-2 coats on most walls, 10-15 year interior, 8-12 exterior.

## Prep Time Is Where Pros Earn Their Rate

Materials are usually 10-20 percent of a pro paint job. Labor is 80-90 percent. A good exterior prep crew does:

- Pressure wash ($0.20-0.40/sq ft)
- Scrape loose paint
- Fill cracks and nail holes
- Caulk gaps around windows, doors, and trim
- Spot-prime bare wood
- Mask windows, doors, and landscaping

Skipping prep (what economy painters do) causes the new paint to fail in 2-4 years. Proper prep extends exterior paint life to 8-12 years.

## DIY Tips

- Buy one extra gallon for touch-ups (or keep receipts for returns at Home Depot)
- Use a 5-gallon bucket and a 3/8 inch nap roller for walls
- Use a 2.5 inch angled sash brush for cutting in
- Plan 150-300 sq ft per hour painting rate including prep
- Temperature must stay 50-90 degrees F for latex paint to cure properly

## Frequently Asked Questions

**Q: How much does it cost to paint a 2000 sq ft house?**

A: Interior painting of a 2,000 sq ft home (walls only, 2 coats standard paint) runs $800-1,100 DIY materials or $12,500-19,000 pro. Exterior painting for the same home costs $10,000-16,500 pro. Whole-home interior plus exterior runs $22,500-35,500 pro at standard-quality paint.

**Q: How is a Home Depot paint calculator different from this one?**

A: A Home Depot paint calculator typically uses the same formula (area divided by 350 sq ft/gallon times number of coats) but defaults to Behr or Glidden pricing. This home paint calculator works the same way but lets you pick economy, standard, or premium tiers regardless of retailer, and it includes pro labor estimates if you don't plan to DIY.

**Q: What's the difference between this and an exterior home paint calculator?**

A: An exterior home paint calculator uses a lower coverage rate (275 vs 350 sq ft/gal) because siding is rougher than drywall and needs more paint per square foot. Exterior paint itself also costs 10-20 percent more than interior because of UV and moisture additives. Multi-story exterior jobs add 10 percent labor per story for scaffolding and ladder work.

**Q: How many gallons of paint do I need for a 2000 sq ft house?**

A: Interior walls only (2 coats): about 35 gallons of standard paint. Exterior siding: about 37 gallons (lower coverage on rough siding). Whole home both: 72 gallons total. Add 1 gallon extra for each color for touch-ups. Bulk 5-gallon bucket savings kick in once you need 10+ gallons of one color.

**Q: How long does interior painting take?**

A: A pro crew paints about 300-500 sq ft of wall per hour per painter including cutting in and rolling. A 2,000 sq ft home (6,000 sq ft of wall) takes 3-5 pro days with a 2-person crew. DIY at 150-300 sq ft/hour takes 2-4 weekends for one person. Prep (filling holes, caulking, taping) typically doubles the actual paint time.

**Q: What does a pro painter charge per square foot?**

A: Interior painters charge $1.50-3.50 per sq ft of wall area; exterior runs $1.75-4.00 per sq ft of siding. The high end covers prep, multiple colors, trim and doors, and premium paint. The low end is single-color, minimal prep, builder-grade paint. Ask for line items so you can see what prep and paint quality are included.

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Source: https://vastcalc.com/calculators/construction/home-paint
Category: Construction
Last updated: 2026-04-08