Paint and coating calculators

How to choose (21 checks)

1. If you already know the area, start with Paint Coverage for liters/gal and can counts.
2. For exterior parts (walls/roof/fence/deck), use the matching calculator.
3. For costs, use Paint Cost. For industrial coatings, use DFT/WFT.
4. If you are finalizing sample colors, open Color Picker after quantity planning.
5. If two approved swatches still need a midpoint candidate, use Color Mixer before you settle the final palette.
6. If one approved swatch now needs analogous, complementary, or triadic relationships, use Color Harmony before you widen the full palette.
7. If one approved base color now needs lighter, darker, or accent options, use Color Palette before the final format handoff.
8. If one approved brand color now needs ready-made surface, text, accent, and border roles that still respect contrast targets, use Accessible Color Palette before the final readability check.
9. If those roles are mostly acceptable but you still want one visual sign-off in cards and buttons before code handoff, use Color Token Preview before the export step.
10. If the preview looks acceptable and the next question is whether duplicate roles, weak contrast pairs, or near-identical tokens still remain, use Color Token Audit before export.
11. If the next question is how the new token set differs from the current production or current theme candidate, use Color Token Diff after Audit and before Export.
12. If the role colors look believable but semantic names still feel vague, use Semantic Color Tokens before the final export step.
13. If the semantic names already look believable and the remaining question is how they should map into button, card, input, nav, or badge aliases, use Component Color Tokens before the final export step.
14. If component aliases already look believable and the remaining question is how hover, active, disabled, focus, or selected states should be named, use State Color Tokens before the final export step.
15. If state aliases already look believable and the remaining question is how one base hue should branch into light, dark, alt, or high-contrast theme bundles, use Theme Color Tokens before the final export step.
16. If those role colors are already acceptable and the next job is shipping CSS vars, JSON tokens, or a utility map, use Color Token Export before you hand the palette to code.
17. If one approved color now needs ordered light-to-dark token steps for UI or charts, use Color Scale before you build gradients or final docs.
18. If one approved swatch needs a warm / cool / neutral direction check before you expand it, use Color Temperature first.
19. If the final deliverable is a CSS background rather than a single swatch, use Gradient Generator after you already know the candidate colors.
20. If you need to quantify how far two approved swatches are apart before picking a final pair, use Color Difference after direction and harmony are roughly settled.
21. If a spec sheet or CSS snippet already gives you one color format, use Color Converter to switch between HEX, RGB, HSL, and common names before you share or document the palette.
22. If the approved color now needs perceptual-space values for token editing or modern CSS work, use OKLCH Converter after the standard format check.
23. If two approved colors are fixed and the next job is shipping a color-mix() expression for CSS or token docs, use CSS Color Mix after OKLCH review.
24. If you need to verify readability for labels, captions, or painted signage, run Contrast Checker before approving the palette.

Build the estimate in the same order you buy and apply paint

Most paint planning questions become easier when you separate four jobs: measure the paintable area, choose the right surface calculator, add coats/primer/waste, and only then estimate cost. This topic is strongest when used as that sequence rather than as a flat list of pages.

Recommended flow

1. Measure area first. Use Paint Coverage if you already know the area, or use the surface-specific calculator for rooms, exterior walls, roofs, fences, or decks.
2. Lock the coating system next. Confirm topcoat coats, primer coats, porous-surface absorption, and waste before you trust the quantity.
3. Price the job last. Open Paint Cost only after quantity is believable enough to quote materials, labor, and access.

Color workflow after quantity planning

1. Use Color Picker when you are still browsing swatches and want one working color value fast.
2. Use Color Mixer when two candidate colors need a midpoint option before you commit the palette.
3. Use Color Harmony Generator when the next decision is about analogous, complementary, triadic, or split-complementary hue relationships.
4. Use Color Palette Generator when one approved swatch needs nearby lighter, darker, or accent options.
5. Use Accessible Color Palette when that approved brand color now needs role-based UI colors for surfaces, text, accents, and borders with AA or AAA targets in mind.
6. Use Color Token Preview when those roles are mostly settled and you want one last browser-side UI check before the token handoff.
7. Use Color Token Audit when those roles already preview well and the remaining question is whether duplicates, near-matches, or contrast failures still need cleanup before export.
8. Use Color Token Diff when the next job is comparing the approved next set against the current theme before you replace or export it.
9. Use Semantic Color Tokens when the palette direction is already acceptable and the remaining question is how to map those roles into named semantic tokens for product, docs, or marketing handoff.
10. Use Component Color Tokens when those semantic names already look acceptable and the remaining question is how to map them into button, card, input, nav, or badge aliases before export.
11. Use State Color Tokens when component aliases already look acceptable and the remaining question is how to name hover, active, focus, disabled, or selected states before export.
12. Use Theme Color Tokens when the same base system now needs light, dark, alt, or high-contrast theme bundles before the export handoff.
13. Use Color Token Export when those roles are already acceptable and the remaining task is packaging them into CSS vars, JSON tokens, or a utility-map handoff.
14. Use Color Scale Generator when one approved color now needs ordered token or chart steps.
15. Use Color Temperature Checker when the open question is direction: warm, cool, or neutral.
16. Use Gradient Generator when the approved colors now need a background-ready linear or radial gradient with copyable CSS.
17. Use Color Difference when two final candidates look close and you need a measurable gap before documenting or approving them.
18. Use Color Converter when the approved color must move between HEX, RGB, HSL, or a named-color notation for docs, specs, or CSS.
19. Use OKLCH Converter when that approved color now needs OKLCH or OKLab values for perceptual editing, modern CSS, or token review.
20. Use CSS Color Mix when two approved colors now need a production-ready color-mix() expression for code or design-token specs.
21. Use Contrast Checker last when the final foreground/background pair must pass a readability check.

When to switch tools

• Use Interior Paint when the job is one room or ceiling and you need wall-area logic.
• Use Exterior Paint, Roof Paint, Fence Paint, or Deck Paint when the geometry matters more than the final can count.
• Use DFT/WFT when the coating spec is defined by film thickness instead of retail coverage labels.

Checks before you order

• Confirm the exact label coverage on the paint system you will actually buy.
• Increase waste or absorption for spraying, rough masonry, new drywall, bare wood, or major color changes.
• Keep one saved URL for the quantity estimate and another for the cost estimate so the quote can be audited later.

See also

• Paint Coverage
• DFT/WFT
• Paint cost
• Color picker
• Color mixer
• Color harmony
• Color palette
• Accessible color palette
• Color token preview
• Color token audit
• Color token diff
• Semantic color tokens
• Theme color tokens
• Color token export
• Color scale
• Color temperature
• Gradient generator
• Color difference
• Color converter
• OKLCH converter
• CSS color mix
• Contrast checker
• Unit conversion

Recommended (top 3)

If you are unsure where to start, these cover most paint planning needs.

Calculators

What this guide helps you do

• Runs in your browser. Inputs are not sent.
• Shareable URLs help you save and revisit settings.
• Switch units (metric / US) in supported calculators.

Build the estimate in the same order you buy and apply paint

Paint planning usually breaks when teams jump straight to gallons or total cost before the surface scope is stable. Start with area, then choose the calculator that matches the job type, and only after that convert to coats, cans, and budget.

Recommended order

• Measure paintable area first with the calculator that matches the surface: room, exterior wall, roof, fence, or deck.
• Add coats, waste, and primer once the surface count is believable.
• Switch to DFT/WFT only when the job is specified by film thickness instead of retail coverage labels.
• Open House Paint Cost Estimate after material quantity is settled enough to price labor, prep, and access.

When epoxy or specialty coatings change the workflow

Epoxy floors, river tables, and self-leveling pours often need volume planning and batch control before area-based coverage. In that case, start with Epoxy Resin Quantity, then confirm Part A/B split in Epoxy Mix Ratio.

FAQ

Before you order material

• Check whether trim, ceilings, fascia, rails, or the back side of fences should be included or excluded.
• Use the product label as the final source for spread rate, primer compatibility, and recoat limits.
• Round up by container size after you add waste, not before, so touch-up stock is intentional.
• Keep surface prep separate from coverage math when you explain scope to a client or teammate.

This keeps each page focused on one decision: surface quantity, coating thickness, epoxy mix control, or full project cost. The cleaner the handoff between those decisions, the less likely you are to buy the wrong amount for the right area.

Choose the next calculator

• Paint Coverage Calculator
  Best starting point when you already know the room or total area and need cans, coats, primer, and waste.
• DFT/WFT Calculator
  Use this when the spec is written in microns or mils instead of retail coverage per can.
• Epoxy Resin Quantity
  Open this first for flood coats, resin pours, and specialty coating jobs where batch size matters.
• Epoxy Mix Ratio
  Use after total resin volume is known and you need an exact Part A / Part B split by weight or volume.
• Unit Conversion
  Useful when supplier sheets mix square feet, square meters, gallons, liters, mils, and microns.

Tools