Why the right starting amount matters
While a worm population will grow to fit its environment, starting with the right amount is key to a smooth beginning. Too few worms can be slow to process your food scraps, while too many can lead to competition for food before the bin is fully established. Our calculator uses the surface area of your bin—the primary space where worms feed—to find that sweet spot.
Surface area: The key metric
The most reliable way to calculate the initial worm population is by using the surface area (length x width) of your bin. This is because composting worms are surface-feeders, living and eating in the top layers of bedding. A larger surface area can support more worms and process food scraps faster. Our calculator uses this industry-standard metric to give you a reliable estimate.
Worm calculator
Enter the dimensions of your worm bin in the calculator below to get an estimated starting weight for your composting worms. This will give your new system a balanced and healthy start.
Please enter the dimensions (length and width in cm) of your continuous flow vermicomposter in the fields above to see the calculations.
Understanding your composting worms
The success of your bin depends on using the right species. Composting worms, like Red Wigglers, are surface-dwellers that thrive in a contained environment, unlike common garden worms. They are nature’s most efficient recyclers. Our detailed guide introduces you to these essential workers and explains how to care for them.
Bonter One fits into daily life
Step 1 – Add
Drop your daily fruit and veggie scraps into the top opening of Bonter One.
Step 2 – Transform
Worms and microbes get to work. Silently, without electricity or odor.
Step 3 – Give back
Harvest rich, living compost to feed your plants or share with others.
Frequently asked questions
What if my bin is round or an unusual shape?
Is it better to have more or fewer worms than recommended?
Will this number change over time?
Perfect for lush indoor plants, the garden, or sharing with the community.
Vegetables
From peels to stems, most vegetable scraps are a perfect meal for your composter.
Fruits
Cores, peels, and rinds provide the energy needed for a healthy, active system.
Household items
Coffee grounds, tea bags, and eggshells add valuable nutrients to your final compost.