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Easily calculate concrete volume, slope, and ramp length with our free Concrete Ramp Calculator. Accurate, ADA-compliant, and supports all unit types.
Creating a concrete ramp requires precision, especially when it comes to calculating the right amount of material. Whether you're building a ramp for a home entrance, a wheelchair-accessible slope, or a loading dock, having the correct dimensions and volume is crucial for stability and safety. Our Concrete Ramp Calculator is designed to make your job easier. It simplifies the process of determining the volume of concrete needed, the slope ratio, and whether your ramp meets ADA (Americans with Disabilities Act) standards.
A concrete ramp is a sloped surface used to overcome a vertical height, usually replacing or accompanying stairs. It allows easier access for people using wheelchairs, trolleys, or carts. These ramps are commonly seen in homes, hospitals, offices, warehouses, and commercial buildings.
To construct a durable and safe concrete ramp, it's important to calculate the correct rise, run, ramp length, and volume of concrete. That’s where our calculator comes in.
To accurately calculate the amount of concrete required for a ramp, you need three basic measurements:
The shape of a ramp is essentially a triangular prism, and the formula to calculate the volume of concrete is:
Volume = (1/2 × Rise × Run) × Width
This formula gives you the volume in cubic units (such as cubic meters, feet, or yards), which you can then convert into the number of concrete bags or cubic meters needed.
Using our calculator is simple:
The calculator will instantly show you:
The depth or thickness of a concrete ramp depends on the purpose and the expected load. For light pedestrian use, 4 inches (10 cm) is usually sufficient. For heavier loads like vehicles or carts, the thickness should be 6 inches (15 cm) or more, possibly with rebar reinforcement.
Always ensure the sub-base is well-compacted to prevent cracks and settlement over time.
A 1:20 ramp slope means that for every 1 unit of vertical rise, there are 20 units of horizontal run. This is considered a very gentle slope, typically used for long access ramps. It translates to a 5% slope (1 ÷ 20 × 100) or roughly 2.86° in angle.
In contrast, the ADA maximum slope for a ramp is 1:12, or about 8.33%.
Here's the full set of formulas used in our calculator:
These calculations are used to determine the amount of concrete needed for your ramp and to ensure it meets slope safety standards.
Building a concrete ramp isn’t just about pouring cement. It’s about understanding slope, safety, accessibility, and durability. Our Concrete Ramp Calculator takes the guesswork out of your project. Whether you’re a homeowner, builder, or contractor, you can rely on accurate, unit-friendly results every time.
Simply enter your measurements, choose your slope input type, and let the calculator handle the math. You’ll get a quick and precise estimate of the ramp length, slope, and volume of concrete needed, helping you plan, purchase, and build smarter.
You’ll need to know the rise, run, and width of the ramp. Then use the formula:
(½ × Rise × Run) × Width
Yes! It’s suitable for any type of sloped surface residential, commercial, or industrial.
The ADA recommends a maximum slope of 1:12, which is about 8.33%.
No, it’s a very gentle slope ideal for long-distance access ramps or low-gradient paths.
Yes, you can switch between metric, imperial (feet), or yards for both input and output.