A free AI tool for golf courses and equestrian facilities. Upload the report from your lab or supplier and see your gradation curve against the recommended range, before you buy a single ton.
Free. A first check only, see the note below.
Lab and supplier sieve analyses, metric or imperial, passing or retained. Or type the values in.
The numbers become an easy-to-read gradation curve, with Cu and Cc calculated for you.
Against the USGA greens range or our equestrian range.
Compare suppliers, or check how your sand changes over time.

Or type in the values from your lab or supplier.

Drawn in seconds, with Cu and Cc.

Against the range for your use, saved for next time.
Type in or upload your numbers. You add your name and email only when you want to see the results.

Fine particles fill the pores water needs to drain through, so a few percent of silt and clay can turn a free-draining sand into a wet one. A very uniform sand stays loose; a wide mix packs firm. And sand changes after it's installed, as fines wash in and grains break down.
In Capillary bunkers and arenas, the Capillary Wash Box removes fine particles from the installed sand without removing it, bringing it back towards its original curve.
How much water the sand holds at different depths.
How fast water moves through the sand.
Yes. No sign-up to start. Enter your numbers, then add your name and email to see your results.
Lab and supplier sieve analyses, in metric or imperial, as passing or retained percentages. You can also type the values in.
The USGA recommended range for putting green root zones, used as a reference for bunkers too, and CapillaryFlow's equestrian range.
No. It is a first check. Grain shape, firmness, infiltration and chemistry still need an accredited lab.
It takes a minute, and you only add your email when you want to see the results.

The recommended ranges are based on industry experience and research and do not guarantee how a sand will perform. Always confirm results with an accredited soil testing laboratory or your sand supplier before ordering or installing sand. CapillaryFlow accepts no responsibility for decisions made on the basis of the calculator's results.