Use the free Tumbler Compost Planner below, right in your browser. No sign-up, no software to install, and nothing is sent to a server.
A tumbler promises fast compost with easy turning, and it delivers when you treat it as a batch system rather than a bottomless bin. A tumbler compost planner turns your tumbler size and your weekly scraps into a fill time, a curing period, and a total batch time you can put on a calendar. That single change, stopping additions and letting a batch cure, is what separates tumbler owners who harvest compost from owners who just spin a drum of old scraps.
The batch rule is the heart of tumbler composting. Fill the drum over several weeks, adding browns with every load of scraps, and when it reaches about four fifths full, stop. No more additions, however tempting the next bucket of peelings looks. Turn regularly for three more weeks of curing, and only then empty it. If you keep adding fresh material during curing, the batch clock restarts and the compost never finishes evenly.
Fill speed depends on your household, and the planner makes it visible. A small household adding ten litres of scraps a week fills a two-hundred-litre tumbler in about sixteen weeks, while a larger household fills the same drum in half the time. Knowing the fill time helps you plan: start a batch in spring and it may be ready for autumn beds, or start in autumn and it may feed spring planting. Either way, the calendar date keeps you honest.
Turning a tumbler is easier than turning a heap, but it still needs a routine. Five to ten turns every two to three days while filling mixes fresh material into the working core and keeps air moving. During curing, turn daily if the batch cools early, since a tumbler loses heat faster than a big heap. If the drum feels heavy and hard to turn, it is probably too wet or too full, and browns plus a rest will fix both.
Browns are even more important in a tumbler than in a heap, because a sealed drum cannot dry itself out. Every load of kitchen scraps should be matched with shredded cardboard, dry leaves, or straw, roughly two parts browns to one part scraps by volume. Without browns, a tumbler quickly becomes a wet, smelly drum that is hard to turn and slow to finish. With browns, it stays crumbly, airy, and pleasant to spin.
Moisture checks in a tumbler mean opening the drum and squeezing a handful, just like a heap. The target is the same: damp like a wrung-out sponge, holding shape with one or two drops. A tumbler that drips when turned is too wet, and needs browns and a few days with the air vents open. A tumbler that looks dusty needs water added a little at a time while you turn. Do not trust the outside of the drum to tell you anything about the inside.
Two-chamber tumblers solve the batch problem neatly. Fill one chamber while the other cures, then swap roles, and you always have a batch finishing while the next one fills. If you have a single-chamber tumbler, keep a holding bucket or a small heap for scraps during the three-week cure, so nothing tempts you to restart the batch. The planner batch time still applies, and the second container is just a waiting room.
What to put in a tumbler matches a normal compost pile, with a few extras to avoid. Fruit and vegetable scraps, coffee grounds, eggshells, leaves, and shredded paper all work well. Avoid meat, fish, oils, and cooked food, which attract pests and smell in a small drum, and avoid woody branches that jam the turning mechanism. Chop scraps small before adding them, because small pieces break down much faster in a tumbler limited volume.
Harvest day is satisfying when the batch has cured properly. Finished tumbler compost is dark, crumbly, and earthy-smelling, with few recognisable pieces left. Sieve out any stubborn bits and return them to the next batch as a starter. Spread the finished compost two to five centimetres thick on beds, or mix it into potting mix at about one part compost to three parts mix for containers.
Tumblers have limits worth knowing. They hold less than a heap, they cool faster in winter, and they cannot handle large garden waste like branches or big leaf falls. In cold weather, site the tumbler in sun, insulate it with an old blanket on frosty nights, and expect batches to take longer. In summer, check moisture more often, since a dark drum in full sun can dry a batch surprisingly fast.
Try the tool above with your tumbler size and weekly scraps, then write the fill and ready dates on a calendar. A tumbler run as a batch system is one of the tidiest ways to compost in a backyard, and the planner turns its simple drum into a reliable, repeatable routine.
Versión en español: Planificador de Compostera Giratoria Para Patios