About
Skate Pour Calculator: Skatepark Concrete Calculator
Skate Pour Calculator works out how much concrete a skatepark feature actually takes, so you can order the right amount before you dig. Instead of guessing at the curved geometry of a transition or a conical corner, you enter the height, radius, length and width you plan to build, set your slab thickness, and the tool returns the surface area, the concrete volume in cubic yards or cubic meters, and the equivalent number of 80 lb and 60 lb bags. Every feature you price can be added to an order summary, which totals the volume across the whole build and can add a 10% waste buffer for spillage and over-excavation. Sliders cover both standard (feet and inches) and metric (meters and centimeters) so you can work in whatever your drawings use.
Open the CalculatorWho it's for
Skate Pour Calculator is built for the people who actually pour the concrete: DIY crews putting in a backyard quarter pipe or bowl, skatepark contractors pricing a full build, city parks departments budgeting a replacement transition, and community groups raising money for a new spot. It fits anyone who needs a defensible material quantity before a truck shows up, without hiring an estimator for a single feature.
Who builds it
Skate Pour Calculator is an independent tool, built and maintained by skatepark builders and concrete crews who got tired of estimating transitions by eye. The geometry behind every calculation is written out on this page so you can check the numbers yourself, and the calculator stays free to use. If a shape you build isn't covered yet, tell us through the contact page and we'll look at adding it.
How each shape is calculated
Every shape is treated as a shell of your chosen slab thickness measured along the riding surface, which is how skatepark flatwork is usually poured.
Quarter Pipe
Transition ramp
The riding surface is an arc of radius R that meets the ground at its base, so its length is R x sweep, where the sweep is the angle that reaches your ramp height. That arc length times the ramp width gives the surface area, and the area times your slab thickness gives the concrete volume. The deck lip is drawn at a fixed 1 ft (0.3 m) so the transition scale stays honest.
Bank Ramp
Flat incline
A straight sloped face: the incline length is the square root of height squared plus base length squared, and the same relation gives the incline angle in degrees shown on the diagram. Incline length times ramp width is the surface area, multiplied by slab thickness for the volume.
Cone Frustum
Conical corner
The corner of a bowl or snake run is a cone with its tip cut off. Slant height comes from the cone height and the difference between the base and top radii. Surface area is half the slant height times the sum of both circumferences, then multiplied by slab thickness for the volume.
Ledge (Flat Pad)
Flat slab
The simplest pour: length times width gives the slab area, and multiplying by thickness gives the volume. You can also trace the slab edge with your phone camera using AR Slab Trace and send the result straight to the order.
Where the numbers come from
- Volumes are shown in cubic yards and cubic meters, converted from the base unit you entered.
- Bag counts assume an 80 lb bag yields 0.6 ft3 (45 bags per cubic yard) and a 60 lb bag yields 0.45 ft3 (60 bags per cubic yard).
- The waste buffer adds 10% to the total for spillage, uneven subgrade and over-excavation.
- AR Slab Trace estimates a traced slab from your phone camera and is a field estimate, not a substitute for a tape measure.