Fire Pit Paver Calculator
A round fire pit is a stack of paver rings. The number of pavers in one ring is the circumference at the wall centerline (pi times the mean diameter) divided by the paver width. The number of rings, or courses, is the wall height divided by the paver height. Multiply the two for the total block count. This calculator works from your mean ring diameter, paver width, paver height, and wall height using nothing but circle geometry, then rounds up so partial blocks become whole purchases.
Fire pit paver formula
Circumference = pi * mean diameter
Pavers per course = ceil(circumference / paver width)
Courses = ceil(wall height / paver height)
Total pavers = pavers per course * courses
The circumference is taken at the wall centerline using the mean diameter. Pavers per course and courses are each rounded up because partial blocks and partial rows require whole units. Multiplying gives the total block count for the ring.
Fire pit build notes
- The mean diameter is measured to the centerline of the wall, between the inner and outer faces.
- Circumference equals pi times diameter, the exact perimeter of a circle.
- A typical above-ground wall is 12 to 18 inches tall, about 3 to 4 courses of standard pavers.
- A steel fire ring insert protects the blocks from direct heat and is a separate purchase.
- Buy a few spare blocks because a round course rarely divides into an exact whole number.
Fire pit pavers: frequently asked questions
How many pavers do I need for a round fire pit?
Find the ring circumference at the center of the wall: pi times the mean diameter. Divide that by the paver width to get pavers per course, then multiply by the number of courses (wall height divided by paver height). For a 36 inch mean diameter ring using 8 inch wide, 4 inch tall pavers, that is 15 pavers per course times 3 courses, or 45 pavers.
Which diameter should I use, inside or outside?
Use the mean diameter measured to the centerline of the wall, halfway between the inner and outer faces. Using the centerline circumference gives the most accurate paver count because trapezoid or rectangular blocks are spaced along that line. This calculator asks for the mean ring diameter directly.
How tall should a fire pit wall be?
A common above-ground fire pit wall is about 12 to 18 inches tall, which is roughly 3 to 4 courses of standard wall pavers. Local codes and the fire pit insert size also matter. Enter your planned wall height and paver height and the calculator computes the number of courses.
Do I need a metal insert or fire ring?
Many builders add a steel fire ring inside the pavers to protect the blocks from direct heat and prolong their life. The insert is a separate item not counted here. This calculator counts only the paver blocks forming the ring wall based on your diameter and block dimensions.
Should I round the paver count up?
Yes. Pavers per course is rounded up because a partial block still requires a whole one, and the total is rounded up too. Buy a couple of spare blocks for breakage and to dry-fit the ring before mortaring or stacking, since round courses rarely divide into an exact whole number.
Official sources
- U.S. Consumer Product Safety Commission: Outdoor fire safety guidance.
- U.S. National Institute of Standards and Technology: Unit conversion (inch).
Reviewed by the CalculatorHub team, edited by James Graham, 16 June 2026. See our methodology.