Measure Rise, Run & Width Before The Pour
Use this Concrete Ramp Calculator to estimate concrete for a straight sloped ramp, ramp with landing, side curbs, or a complete ramp system. Enter rise, horizontal run, width and thickness to calculate slope length, percent grade, cubic feet, cubic yards, concrete bags and optional ready-mix cost.
Choose the ramp component that matches your project. Results remain closed until you press the Calculate button.
Estimate a straight sloped ramp slab using horizontal run, vertical rise, finished ramp width and slab thickness.
Level horizontal distance, not the sloped surface length.
Total elevation change from bottom to top.
Assumed thickness measured normal to the sloped surface.
Material quantity estimate only. Ramp slope, accessibility compliance, structural thickness, reinforcement, base preparation and drainage must follow the applicable project requirements.
Estimate a sloped ramp and a level rectangular landing as one concrete material total.
The landing is modeled as a flat rectangular slab using the ramp width as landing width. Separate pads, turn landings or irregular shapes should be calculated independently.
Estimate one or two rectangular concrete curbs that follow the sloped length of the ramp.
This calculator models each curb as a simple rectangular prism following the slope. Actual curb profiles, flares or wheel-edge details may require separate geometry.
Estimate a straight ramp slab, level top landing and one or two side curbs in one calculation.
The complete-system calculator is a planning model for simple geometry. Add separate footings, walls, drainage features, flared sides or other concrete components if present.
Convert horizontal run and vertical rise into the actual sloped ramp length.
See the rise-to-run relationship as percent grade, slope ratio and angle.
Estimate common 40 lb, 60 lb and 80 lb bag quantities from total cubic feet.
Enter a local price per cubic yard for a basic ready-mix material estimate.
Concrete ramp quantity depends on more than the footprint visible from above. A ramp rises from one elevation to another, so the finished concrete surface is longer than its horizontal run. The Concrete Ramp Calculator uses the Pythagorean theorem to calculate that sloped surface length from the horizontal run and vertical rise. It then multiplies the slope length by the ramp width and slab thickness to estimate material volume.
Start by measuring the horizontal distance from the ramp start to the upper landing or endpoint. Next, measure the total vertical rise. Enter the finished ramp width and the concrete thickness specified by your project. If the ramp includes a separate level landing, use the Ramp + Landing option. Side curbs can be estimated separately or included in the Complete Ramp calculator.
Record the level horizontal distance from ramp bottom to ramp top.
Record the total vertical elevation change between the two endpoints.
Use the finished concrete width and the specified slab thickness.
Include landings and curbs if they are part of the concrete work.
Compare cubic yards with bag yield, supplier increments and project plans.
A straight ramp forms the hypotenuse of a right triangle. The horizontal run is one leg, the vertical rise is the other, and the actual ramp surface length is the hypotenuse. This is why simply multiplying horizontal run × width × thickness slightly understates the concrete in a sloped slab when thickness is measured perpendicular to the ramp surface.
Convert rise to feet before using the formula.
The calculator then applies the selected ordering allowance.
Percent grade compares vertical rise with horizontal run. It is calculated as rise ÷ run × 100. A 30-inch rise over a 20-foot horizontal run equals 2.5 feet ÷ 20 feet × 100 = 12.5% grade. The calculator also shows a slope ratio and angle to make the geometry easier to review.
Rise and run must use the same units.
Assume a straight ramp has a 20-foot horizontal run, a 30-inch rise, a 4-foot width and a 5-inch concrete thickness. First convert 30 inches to 2.5 feet. The slope length is √(20² + 2.5²), or approximately 20.16 feet.
The concrete volume before waste is approximately 20.16 × 4 × (5 ÷ 12), which is about 33.60 cubic feet. Dividing by 27 gives approximately 1.24 cubic yards. A 10% ordering allowance increases the planning quantity to about 1.37 cubic yards. If a landing or curbs are present, their concrete must be added to that quantity.
This example demonstrates why the calculator keeps the geometric ramp volume, ordering allowance and accessory components separate. You can see where the total comes from instead of receiving only one final number.
The slope information shown by this calculator is useful for understanding the geometry of a proposed ramp, but it is not an accessibility approval tool. Accessible route requirements can regulate maximum running slope, cross slope, clear width, landings, handrails, edge protection and other details. Requirements also vary by jurisdiction and project type.
For U.S. accessibility information, consult the official 2010 ADA Standards for Accessible Design and the requirements adopted by the authority having jurisdiction. The calculator should be used to estimate concrete only after the ramp geometry has been established from the applicable design.
Do not lengthen or shorten a ramp solely to reduce concrete quantity. Ramp geometry affects safety and usability. Use approved dimensions, then use this page to convert those dimensions into material volume.
Many ramps terminate at a level landing. A landing is calculated like a conventional rectangular concrete slab: landing length × landing width × landing thickness. In the calculator, landing width is assumed to match the ramp width. The ramp volume and landing volume are calculated separately and then added together before the ordering allowance is applied.
If your design has an intermediate landing, turn landing or landing wider than the ramp, calculate each landing separately. The main Concrete Calculator can be used for additional rectangular slabs, while the Concrete Pour Calculator can help organize a larger multi-component pour.
Side curbs or raised edge elements can add concrete along one or both sides of the ramp. The curb calculator treats each curb as a rectangular prism following the same sloped length as the ramp. Enter curb width and curb height in inches, then select one or two curbs.
Curb width and height are converted from inches to feet.
Real ramp edge details can be more complicated. A curb may be tapered, integrated into a thickened slab edge, interrupted at landings or designed as a wheel guide rather than a full rectangular curb. If the actual cross-section differs, calculate the concrete from the dimensions shown on the plan.
Use the figure to distinguish horizontal run, vertical rise, sloped ramp length, slab thickness, landing and side curbs.
Bagged concrete may be practical for a very small ramp, curb repair or short transition. The calculator converts the adjusted cubic-foot volume into approximate 40 lb, 60 lb or 80 lb bag counts using generic planning yields.
Actual yield differs by product. Always check the manufacturer data printed on the bag before purchasing material.
A longer ramp, wide commercial ramp, full landing system or ramp with curbs can require enough concrete that ready-mix delivery becomes more practical. Ready-mix is commonly ordered in cubic yards, so the calculator provides the adjusted cubic-yard quantity.
Supplier minimum orders, short-load charges, delivery distance and waiting time can affect the final quantity and cost.
A geometric volume is an exact mathematical result for the dimensions entered, but jobsite conditions are rarely perfect. Forms can vary slightly, subgrade can be uneven, concrete can be lost during placement, and measurements may be rounded. The calculator offers optional 0%, 5%, 10% and 15% planning allowances so you can compare the raw quantity with a practical order quantity.
The correct allowance depends on site conditions, form accuracy, ramp complexity and supplier ordering increments. A straight formed ramp may need less extra material than a ramp with multiple landings, curb details and irregular transitions. The selected percentage is a planning input, not a structural or code requirement.
The optional cost field multiplies the adjusted cubic-yard total by the local ready-mix rate you enter. This produces a basic concrete-material estimate for the ramp quantity only. It does not automatically include excavation, base material, reinforcement, formwork, finishing, curing, pump charges, delivery surcharges, handrails, tactile surfaces, demolition, permits or labor.
Concrete pricing varies by region, mix design, supplier, order size and delivery conditions, so this page intentionally asks you to enter your local price instead of assuming a nationwide rate. For additional planning, compare the result with the Concrete Pour Calculator if the ramp is one part of a larger concrete placement.
The calculator derives slope length from horizontal run and rise. Entering the already-sloped length as the run makes the calculated ramp longer than it really is.
A rise entered in inches must be converted to feet before comparing it with a run measured in feet. The calculator handles this conversion automatically.
A level landing can add meaningful concrete volume, especially when it is wider or deeper than the ramp.
Raised concrete edges may run the full slope length and can add measurable volume to the order.
Crushed stone, compacted subbase or excavation depth is not the same as finished concrete slab thickness.
Slope and grade outputs help describe geometry, but the calculator does not verify compliance with ADA standards, local codes or project-specific requirements.
The calculator uses standard geometric formulas, so its arithmetic accuracy depends on the dimensions entered. A straight ramp with uniform width and thickness is straightforward. Curved ramps, flared approaches, changing widths, sloped landings, thickened edges or variable slab sections should be divided into simpler measurable shapes.
The ramp slab calculation assumes the stated slab thickness is measured perpendicular to the sloped surface. Some construction drawings describe slab geometry differently, so use the actual section shown on the plans when available. Bag counts use approximate generic yields; manufacturer data should always take priority for purchasing.
For concrete technical resources, visit the American Concrete Institute and the National Ready Mixed Concrete Association. For general concrete quantities beyond ramps, use the Concrete Calculator or return to the Concrete Ramp Calculator above.
Common questions about ramp concrete volume, rise, run, slope, grade, landings, curbs, cubic yards and concrete bags.