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 for accuracy by Daniel Agrici, Founder & Lead Developer
Acrylic Pour Calculator
Calculator
Adjust values & calculateEnter your values below. Every result is computed in your browser — no data is sent to any server.
Formula: Total Mix = (Canvas Area x Pour Depth x Overpour Factor) x 0.554 fl oz/cu in
Worked example — 25.1 fl oz total | 12.6 fl oz paint (8 tubes) | 12.6 fl oz medium | 12 silicone drops
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 Depth = 3mm = 0.118 inches Base volume = 320 x 0.118 = 37.8 cu in Overpour factor (dirty) = 1.20 Adjusted volume = 37.8 x 1.20 = 45.4 cu in Total mix = 45.4 x 0.554 = 25.1 fl oz (743 ml) Paint (1:1 ratio) = 25.1 / 2 = 12.6 fl oz Medium = 12.6 fl oz Per color paint = 12.6 / 4 = 3.1 fl oz (2 tubes each) Silicone = 3 drops per color x 4 = 12 drops Dry 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 Depth = 4mm = 0.157 inches Base volume = 452 x 0.157 = 71.0 cu in Overpour factor (flip) = 1.25 Adjusted volume = 71.0 x 1.25 = 88.8 cu in Total mix = 88.8 x 0.554 = 49.2 fl oz (1455 ml) Paint fraction = 0.67/1.67 = 40% Paint = 49.2 x 0.40 = 19.7 fl oz Medium = 49.2 x 0.60 = 29.5 fl oz Per color paint = 19.7 / 5 = 3.9 fl oz (2 tubes each) Silicone = 3 x 5 = 15 drops Dry 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.
What is the best paint to pouring medium ratio?
The ideal paint-to-medium ratio depends on the consistency and opacity you want, but a good starting point is one part paint to one part pouring medium (1:1 ratio). This produces a balanced mixture with good color intensity and proper flow characteristics. For more transparent, ethereal effects, use a 1:2 ratio (one part paint to two parts medium), which creates softer colors but flows more easily and produces more organic patterns. For bold, opaque colors with strong definition between layers, use a 2:1 ratio (two parts paint to one part medium), though this thicker mix is harder to work with and may not flow as freely. The target consistency should be similar to warm honey, where paint dripped from a stick creates a continuous stream that holds a brief peak before dissolving into the surface. Always test your mixture consistency before the actual pour.
What is pouring medium and why do I need it?
Pouring medium is a fluid acrylic polymer that thins paint without reducing its pigment concentration or adhesive properties. Unlike water, which weakens the paint film, pouring medium maintains the binder-to-pigment ratio essential for proper adhesion and long-term durability. Popular commercial pouring mediums include Liquitex Pouring Medium, Floetrol (a paint conditioner), Golden GAC 800, and DecoArt Pouring Medium. Each has slightly different properties affecting cell formation, drying time, and gloss level. Floetrol is the most budget-friendly option at about five dollars per quart and produces excellent cells. Liquitex Pouring Medium creates the smoothest, most self-leveling surface at about twelve dollars per sixteen ounces. Without pouring medium, acrylic paint is too thick to flow properly and dries with an uneven, chunky texture rather than the smooth, glossy finish that characterizes fluid art.
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.
How long does an acrylic pour take to dry and cure?
An acrylic pour is typically touch-dry within twenty-four to forty-eight hours, depending on thickness, humidity, and temperature. Standard three-millimeter pours in moderate conditions dry in about twenty-four hours. Thicker pours of five millimeters or more can take three to five days to become touch-dry. Full curing, where the paint reaches maximum hardness and durability, takes significantly longer at approximately three to four weeks for standard thickness. The optimal drying environment is sixty-five to seventy-five degrees Fahrenheit with forty to fifty percent relative humidity and good air circulation. Avoid direct sunlight during drying, as uneven heating causes the paint to dry faster on one side, creating cracking and crazing. Do not stack or varnish pours until fully cured. If the paint surface feels cool to the touch, it still contains moisture and is not fully dry, even if it feels firm when pressed.
How do I prevent cracks and crazing in acrylic pours?
Cracking and crazing are the most common problems in acrylic pouring, primarily caused by paint applied too thickly or dried too quickly. Keep pour depth to three to four millimeters maximum for best results. Thicker pours require significantly longer drying times and are more prone to cracking as the surface dries faster than the interior, creating tension. Avoid adding too much water to the paint mixture, as water weakens the acrylic binder and leads to adhesion failure. Use pouring medium instead of water for thinning. Ensure even paint thickness across the entire canvas by tilting slowly and methodically. Dry the piece in a stable environment away from drafts, heaters, air conditioning vents, and direct sunlight, all of which cause uneven drying. Covering the piece loosely with a box or container during the first twenty-four hours creates a controlled micro-environment that promotes even drying across the entire surface.
What should I do with paint that runs off the canvas?
Paint runoff is inevitable in acrylic pouring and should be planned for in advance. Elevate your canvas on push pins, cups, or dedicated canvas risers placed at each corner, with a catch surface underneath like a plastic sheet, aluminum foil, or a disposable roasting pan. The runoff paint that collects below can be repurposed in several ways. Drape string, fabric strips, or paper over a wire rack above the catch surface and pour excess paint over them to create interesting marbled effects. Collect the mixed runoff in a container and use it for future pours as a base color or neutral background tone. Some artists pour runoff paint onto small canvases, tiles, or ornaments for quick additional pieces. Never pour acrylic paint down the drain, as it can clog pipes when it dries and introduces microplastics into water systems. Let excess paint dry completely on your catch surface, then peel it off and dispose of it in regular trash.
How do I finish and protect an acrylic pour painting?
After the pour has fully cured for three to four weeks, apply a protective varnish to enhance colors, add a uniform sheen, and protect against UV damage, dust, and moisture. Liquitex or Golden brand acrylic varnish in gloss, satin, or matte finish is applied with a wide, soft brush in thin, even coats. Apply two to three coats, allowing four to six hours of drying between each coat, with alternating brush directions for even coverage. For the smoothest finish, lightly sand with 400-grit sandpaper between coats. If silicone oil was used for cells, it can create spots where varnish does not adhere properly. Before varnishing, wipe the dried surface with isopropyl alcohol on a lint-free cloth to remove silicone residue. Spray varnish provides a more even finish than brush-on for textured surfaces. Resin coating is the premium finishing option that creates a thick, glass-like surface with extraordinary depth and protection, but it requires careful mixing and application in a dust-free environment.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
Related Calculators
🧮Yarn Yardage Calculator
Calculate how much yarn you need for a project from gauge, dimensions, and stitch pattern.
🧮Gauge Swatch Calculator
Calculate required stitches and rows from gauge swatch measurements for pattern sizing.
🧮Blanket Yarn Calculator
Calculate total yarn needed for a blanket from dimensions, yarn weight, and stitch type.
🧮Sock Yarn Calculator
Calculate yarn needed for a pair of socks from foot size and yarn weight.
🧮Fabric Yardage Calculator for Sewing Patterns
Calculate fabric needed for sewing projects from pattern pieces and fabric width.
🧮Quilt Size Calculator
Calculate quilt dimensions, block count, and fabric yardage from bed size.
🧮Elastic Calculator
Calculate elastic length needed for waistbands, cuffs, and gathered items.