Acrylic Pour Calculator
Calculate acrylic paint and pouring medium amounts for fluid art by canvas size. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Total Mix = (Canvas Area x Pour Depth x Overpour Factor) x 0.554 fl oz/cu in
Calculate the canvas surface area, multiply by the desired pour depth to get volume in cubic inches, apply an overpour factor (15-25% depending on technique), then convert to fluid ounces. Split the total between paint and pouring medium based on your chosen ratio, and divide the paint portion by the number of colors.
Worked Examples
Example 1: Standard 16x20 Dirty Pour
Problem:A 16 x 20 inch rectangular canvas with a dirty pour technique, 3mm pour depth, 4 colors, and a 1:1 paint-to-medium ratio.
Solution:Surface area = 16 x 20 = 320 sq in\nDepth = 3mm = 0.118 inches\nBase volume = 320 x 0.118 = 37.8 cu in\nOverpour factor (dirty) = 1.20\nAdjusted volume = 37.8 x 1.20 = 45.4 cu in\nTotal mix = 45.4 x 0.554 = 25.1 fl oz (743 ml)\nPaint (1:1 ratio) = 25.1 / 2 = 12.6 fl oz\nMedium = 12.6 fl oz\nPer color paint = 12.6 / 4 = 3.1 fl oz (2 tubes each)\nSilicone = 3 drops per color x 4 = 12 drops\nDry time = ~24 hours | Cure = ~9 days
Result:25.1 fl oz total | 12.6 fl oz paint (8 tubes) | 12.6 fl oz medium | 12 silicone drops
Example 2: Large 24-inch Round Canvas Flip Cup
Problem:A 24-inch diameter circular canvas with flip cup technique, 4mm pour depth, 5 colors, and a 1:1.5 paint-to-medium ratio (ratio = 0.67).
Solution:Surface area = pi x 12^2 = 452 sq in\nDepth = 4mm = 0.157 inches\nBase volume = 452 x 0.157 = 71.0 cu in\nOverpour factor (flip) = 1.25\nAdjusted volume = 71.0 x 1.25 = 88.8 cu in\nTotal mix = 88.8 x 0.554 = 49.2 fl oz (1455 ml)\nPaint fraction = 0.67/1.67 = 40%\nPaint = 49.2 x 0.40 = 19.7 fl oz\nMedium = 49.2 x 0.60 = 29.5 fl oz\nPer color paint = 19.7 / 5 = 3.9 fl oz (2 tubes each)\nSilicone = 3 x 5 = 15 drops\nDry time = ~32 hours | Cure = ~12 days
Result:49.2 fl oz total | 19.7 fl oz paint (10 tubes) | 29.5 fl oz medium | 15 silicone drops
Frequently Asked Questions
How much paint do I need for an acrylic pour?
The amount of paint depends on your canvas size, desired pour thickness, and the number of colors. A standard sixteen-by-twenty-inch canvas with a three-millimeter pour depth requires approximately five to seven fluid ounces of total mixed paint. This total includes both acrylic paint and pouring medium combined. Always prepare fifteen to twenty-five percent extra material beyond the calculated canvas coverage because paint flows over the edges during the pouring process and some remains in your mixing cups. For your first pour, err on the side of more paint rather than less, as running out mid-pour creates visible lines and dry patches that cannot be fixed once the paint begins to set. A general rule of thumb for quick estimation is one fluid ounce of mixed paint per twenty square inches of canvas surface.
How do I create cells in an acrylic pour?
Cells form when paint layers of different densities interact, causing lighter pigments to push through heavier ones. The most reliable method for creating cells is adding one to three drops of silicone oil (such as dimethicone or treadmill lubricant) to each color cup before pouring. Stir the silicone gently, leaving some unmixed for varied cell sizes. A torch or heat gun passed quickly over the wet surface (six to eight inches away for one to two seconds per area) brings cells to the surface by warming the top layer and allowing silicone-separated colors to rise. Different pigment weights naturally create cells without silicone: titanium white is very heavy, while colors like phthalo blue are lighter. Using a color with high specific gravity next to a lighter color enhances cell formation. Too much silicone creates uniformly sized cells that look artificial, while two to three drops per cup produces a more natural, varied pattern.
What are the different types of acrylic pour techniques?
The dirty pour involves mixing all colors into a single cup in layers and then pouring the entire cup onto the canvas at once, creating organic swirls and cells where colors interact. The flip cup technique layers colors in a cup, places the canvas face-down on top, then flips the whole assembly so the cup sits inverted on the canvas and is lifted to release the paint. This produces a concentrated central design that is then tilted to cover the canvas. The puddle pour applies each color separately in concentric puddles on the canvas, building up layers that create bull's-eye patterns. The swipe technique pours colors side by side, then drags a damp paper towel or palette knife across the surface to reveal cells and create dramatic color stretching. The tree ring pour uses a funnel with colors layered inside, creating concentric ring patterns as paint flows through the narrow opening.
What surfaces can I use for acrylic pouring?
Stretched canvas is the most popular surface for acrylic pours because it is lightweight, readily available, and the paint wraps beautifully around the edges for a finished gallery look. Pre-primed canvas works fine, though some artists prefer to apply an additional coat of gesso for better paint adhesion. Wood panels and MDF boards create a rigid, non-flexing surface that prevents cracking as thick pours dry, making them ideal for pieces with heavy paint application. Always seal raw wood with two coats of gesso before pouring. Ceramic tiles produce stunning coasters and decorative pieces and require no preparation before pouring. Glass, vinyl records, and furniture pieces can also serve as pour surfaces with proper priming. Avoid porous surfaces like unfinished wood or fabric that absorb the pouring medium and cause the paint to sink and lose its glossy finish. For beginners, inexpensive canvas boards from craft stores are perfect for practice.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy