Concrete Stoop Calculator

Calculator built by BuilderToolkits | Updated February 2026

A concrete stoop is the small landing platform at your front or back door, typically 4–6 feet wide by 3–5 feet deep. Most stoops are 4–6 inches thick, requiring 0.4–0.8 cubic yards of concrete.

This calculator estimates concrete volume for rectangular stoops in cubic yards, cubic feet, and 80-lb bag counts. Enter your stoop dimensions and the calculator handles waste automatically. For cost planning, see the concrete cost per yard guide.

For stoops with steps, calculate the landing platform here, then use the concrete steps calculator for the stair section. Most stoops need rebar — use the rebar estimator for reinforcement planning.

Inputs

Length (ft)

Width (ft)

Height (ft)

Waste (%)

Small porch guidance: A compact stoop often ranges from 3–6 ft wide by 4–6 ft deep, depending on door clearance and steps.

Frost depth note: If your area freezes, footings should extend below frost depth per local code.

Common Stoop Sizes & Concrete Needed

Stoop Size	Thickness	Concrete (yd³)	80-lb Bags	Typical Use
3×4 ft	4 in	0.15 yd³	7 bags	Small back door
4×5 ft	4 in	0.25 yd³	11 bags	Standard side door
5×6 ft	6 in	0.55 yd³	25 bags	Front entry (no steps)
6×6 ft	6 in	0.67 yd³	30 bags	Large landing platform
4×6 ft	8 in	0.59 yd³	27 bags	Heavy-duty entry

Estimates include 10% waste. Does not include steps — calculate steps separately with the steps calculator.

Results

Concrete volume

0.49 yd³

13.2 ft³ total

Includes 10% waste.

80-lb bags (rough)

23 bags

Assumes ~0.6 ft³ yield per 80-lb bag (varies by mix).

Assumptions

Stoop is a rectangular block with uniform dimensions.
Waste factor covers spillage, form loss, and finish overage.
80-lb bag yield is an approximation; verify product labels.

Next Steps

✓Round up to the nearest 0.25 yd³ for ready-mix orders.

✓Estimate reinforcement with the rebar estimator.

✓Use the gravel base calculator for subbase planning.

Example

A 6 ft × 4 ft stoop at 0.5 ft height with 10% waste needs about 0.49 yd³ of concrete.

How to Calculate a Concrete Stoop (Formula)

Volume (ft³): Length (ft) × Width (ft) × Height (ft)

Cubic yards: Volume (ft³) ÷ 27 × (1 + Waste %)

FAQ

How thick should stoop be?

Many stoops are 4–6 inches thick, with thicker sections or footings for heavy loads or frost conditions. Verify local requirements for your area. For small pours, price bag mix with the concrete bag calculator.

Do I need rebar?

Most concrete stoops benefit from reinforcement to control cracking. Use the rebar estimator for quantity planning and follow local code for spacing.

How long to cure before walking?

Light foot traffic is often possible after 24–48 hours, but full cure takes weeks. Protect the surface and follow mix guidance for timing.

Do I need footings?

Footings are commonly required for stoops in frost regions or where loads are high. Footings should reach below frost depth per local code, and base prep can be planned with the gravel base calculator.

How much does a concrete stoop cost?

Costs vary by size, finish, and labor. Use this volume estimate to price concrete, then add formwork, reinforcement, and finishing costs.

Related Concrete Tools

Concrete Estimating Guide

Concrete Calculation Guide