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Calcimator

Color Ratio Calculator

Apply the 60-30-10 color rule to your room. Calculate ideal dominant, secondary, and accent color areas based on your surfaces.

About this calculator

This calculator applies interior design's classic 60-30-10 color rule to your actual room dimensions. It first sums your four surface inputs — wall area, ceiling area, visible floor area, and furniture/accessory surface area — into a single "total visual area," then multiplies that total by 60%, 30%, and 10% to report the ideal square footage each color role should occupy: the dominant color (typically walls and ceiling, the backdrop that sets the room's overall tone), the secondary color (usually flooring and large upholstered pieces, which anchor the space), and the accent color (art, pillows, and small accessories that add contrast and visual interest). Alongside those targets, it also computes your room's current distribution by treating wall-plus-ceiling area as your actual "dominant" share, floor area as your actual "secondary" share, and furniture area as your actual "accent" share, then expressing each as a percentage of the total.

Comparing your current percentages against the 60/30/10 targets shows at a glance whether your room is unbalanced — for example, too much competing pattern in the secondary layer, or an accent color that's barely present. Keep in mind this only measures physical surface area, not perceived visual weight: a small but highly saturated accent wall or a bold-patterned rug can visually dominate a room far more than its square footage suggests, so treat the ratio as a starting framework to test and adjust by eye, not a rigid formula that guarantees good design on its own.

Inputs

sq ft
sq ft
sq ft
sq ft
sq ft

Results

Dominant Color (60%)

576 sq ft

≈ 13 king-size beds

Secondary Color (30%)

288 sq ft

≈ 7 king-size beds

Accent Color (10%)96 sq ft
Current Dominant %70.8%
Current Secondary %20.8%
Current Accent %8.3%
How to Use This Calculator
  1. Enter Room Floor Area, Wall Area, and Ceiling Area.
  2. Set Floor Area (visible) and Furniture Surface Area.
  3. Review Dominant Color (60%) (sq ft) and Secondary Color (30%) (sq ft).
  4. Use Accent Color (10%) (sq ft) and Current Dominant % (%) to inform your decision.

How the result changes with Wall Area

Wall AreaDominant Color (60%)Secondary Color (30%)
240432 sq ft216 sq ft
360504 sq ft252 sq ft
720720 sq ft360 sq ft
1,2001,008 sq ft504 sq ft

What each input means

Room Floor Area
Floor area of the room for reference.
Wall Area
Total wall surface area (perimeter × height minus openings).
Ceiling Area
Ceiling surface area (typically equals floor area).
Floor Area (visible)
Visible floor area including rugs and floor coverings.
Furniture Surface Area
Visible upholstery, tabletops, and accessory surfaces.

What each result means

Dominant Color (60%)
Ideal area for the dominant/primary color (walls, ceiling).
Secondary Color (30%)
Ideal area for the secondary color (flooring, large furniture).
Accent Color (10%)
Ideal area for accent color (accessories, art, throw pillows).
Current Dominant %
Your walls + ceiling as a percentage of total visible area.
Current Secondary %
Your floor as a percentage of total visible area.
Current Accent %
Your furniture surfaces as a percentage of total visible area.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Room Floor Area = 200, Wall Area = 480, Ceiling Area = 200, Floor Area (visible) = 200 = 5 input(s) provided
  2. Calculate Dominant Color
    Dominant Color
    576 = 576
  3. Calculate Secondary Color
    Secondary Color
    288 = 288
  4. Calculate Accent Color
    Accent Color
    96 = 96
  5. Calculate Current Dominant %
    Current Dominant %
    70.8 = 70.8%

Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Why does the calculator lump ceiling area in with wall area as the 'dominant' color?

The 60-30-10 rule treats the dominant color as whatever forms the room's visual backdrop, and walls plus ceiling together form that continuous backdrop in most rooms. The calculator sums wallArea and ceilingArea into currentDominant for that reason, even though you enter them as two separate inputs.

What happens to the percentages if I set Furniture Surface Area to 0?

Your currentAccent value becomes 0, so the Current Accent % output reads 0% — the calculator will flag a clear gap against the 10% target since there's no accent color present. The total visual area still includes the other three inputs, so dominant and secondary percentages adjust proportionally.

Does the 60/30/10 target account for how bold or saturated a color is?

No — every calculation here is purely area-based; a highly saturated or high-contrast accent color occupying only 10% of the wall area is treated identically to a muted one of the same size. A small bold accent wall can visually dominate a room far more than its square footage suggests, so use the ratio as a starting point and adjust by eye.

How should I use the current percentages against the ideal targets?

Compare each current percentage (dominant, secondary, accent) against its 60/30/10 target square footage — a large gap on any one axis (for example, an accent percentage far below 10%) points to where the room feels unbalanced, whether that's too little contrast color or a secondary layer that's overwhelming the space.

Does Room Floor Area affect the color ratio results?

No — Room Floor Area is collected for reference only and doesn't currently factor into the calculation. The dominant, secondary, and accent totals are derived entirely from Wall Area, Ceiling Area, Floor Area (visible), and Furniture Surface Area.

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