Calculate fence post, panel and paling spacings, with post placement options.
Select Cut Last Panel to keep all panels at entered width, and adjust last panel to fit. If the last panel is too short or long, or to even up both ends, select Cut Both End Panels.

Select Fit All Panels Evenly to adjust all panel lengths and post spacings to fit evenly in Total Length, at nearest under entered Panel Width.

With 'Fit All Panels Evenly' selected, check Min Gap checkbox to maintain equal paling spacing, adjusting gaps to nearest above entered Gap.

Choose end post configuration to adjust panels and posts to suit. For full size panels (no palings) select Panels instead of Palings.

Select a paling gap from the Space to Fit selector to fit full palings evenly in the main panels.

For arched panel palings, enter Panel Width = into Arched Fence Picket Calculator (Main panel width minus end gaps)

For multiple different lengths and spacings in a fence, click to copy current diagram and add to bottom of page.