Ball Bungee Calculator
How Many Ball Bungees Do I Need for My Tarp?
If you’re asking how many ball bungees you need for a tarp, the answer depends on how many grommets are on your tarp. This tarp grommet calculator estimates the number of grommets around the perimeter of a rectangular tarp using your tarp size and grommet spacing.
This tool is helpful for estimating grommets and ball bungees for vinyl tarps, poly tarps, canvas tarps, custom tarps, truck tarps, mesh tarps, and other heavy duty tarps.
Important: This is an estimate only. Manufacturers may adjust spacing near corners and may add an extra grommet close to a corner even if it’s not perfectly on-spacing. To account for that, this calculator adds 4 extra grommets per tarp.
Tarp Grommet & Ball Bungee Calculator
How this estimate works
- Perimeter is calculated as 2 × (width + length)
- Perimeter is divided by your chosen spacing and rounded up
- Adds +4 extra grommets per tarp to account for real-world corner/edge placement
- Ball bungees are estimated at 1 per grommet and rounded up to the next 10
Most people use 1 ball bungee per grommet. We recommend ordering a few extras in case some are lost, damaged, or needed for overlaps.