Enter Outside Radius (not diameter), unit height, width and side joint width and hit 'Calculate'. The calculator will calculate nearest (smaller) outer unit width to fit the circle.
Hit
or
to add or subtract units, varying the top and bottom widths. You can adjust the number of units and side joint size to best suit the size of your pavers.
With straight edges, check 'Circles' to draw inner (Green) and outer (Blue) bounding circles to see the bounds of each unit. For a better view of how the bounding circle dimensions fit, keep hitting '- Unit'
to widen units and clearly show the circles.
The running gauge points are square across the outside edge of each unit, and straight across side joints for straight edges and around the outer circle for curved edges.
Check all dimensions on-site before cutting.