Calculator
Perlite mixing calculator
Calculate how much perlite and potting soil you need for a mix with your chosen perlite share.
Choose the total amount of mix and the share of perlite to see how much of each to combine.
How to use the result
Typical shares: 10–20% for most houseplants, 20–30% for plants that like airy mixes, up to 50% for succulents and cuttings.
Perlite creates stable air pockets, reduces compaction and helps excess water drain.
Moisten perlite before mixing and wear a mask when handling it dry to avoid dust.