Room paint calculator

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    alex.riveraSunday Table

    • Measure a rectangular room in metres; exclude ceilings and trim. Check product coverage and coats before buying.

    📊 Estimate wall area

    Approximate wall area in square metres
    0

    A negative area means the measurements need correction. This rectangular-room model excludes ceilings and trim. Enter coverage from the actual product for the surface; leave it at zero until checked. A dash in the result means coverage is missing or zero.

    📊 Turn measurements into a shopping decision

    2
    Estimated litres including your allowance
    —
    Purchased litres above or below estimate
    —

    Check a positive area and plausible dimensions before buying. Pack quantities are entered manually: choose available packs that cover the estimate. An allowance is your assumption, not a universal recommendation. Record separate primer quantities if required.

    📝 Sequence the job

    For sound, suitable interior surfaces only. Before sanding or scraping, assess hazardous coatings and follow local professional guidance. US pre-1978 homes may contain lead paint: seek qualified lead-safe advice. Stop for unexplained damp, damaged wiring, or unknown materials. Check product drying and ventilation instructions.

  • 1.
    Confirm colour and finish on a small suitable sample.
  • 2.
    Protect furniture and floors, remove loose objects, and prepare only with methods suitable for the verified surface.
  • 3.
    Clean as directed and let surfaces dry. Repair minor defects with compatible products.
  • 4.
    Cut edges, then roll manageable sections while maintaining a wet edge.
  • 5.
    Wait the manufacturer’s recoat interval; apply the next coat if specified.
  • 6.
    Inspect in daylight, label leftover paint, and dispose of materials according to local guidance.
    • Surface suitability checked
    Area and product coverage recorded
    Ventilation planned
    Floor and furniture protected
    Drying time allowed

    📝 Keep the settings that worked

    Keep this record for touch-ups. Re-measure the next room rather than copying its dimensions.

    Worked example · fictional values

    ➡️ Related tool

    Home maintenance inspection checklist.

    Use template
    Comments
    Created by
  • ST
    alex.riveraSunday Table