Terrarium Tools & Calculators
Free, practical calculators for building and maintaining a glass garden — layer ratios, vessel volume, plant count, humidity, moss coverage, and drainage.
Substrate Layer Ratio Calculator
Enter your container's height and whether it's open or closed to get the drainage, charcoal, substrate, and top-dressing depths for a healthy stack
Jar & Vessel Volume Calculator
Pick the shape closest to your container — cylinder, sphere, bell jar, or rectangular tank — and get its total and usable substrate volume
Plant Count Calculator
Give the floor area and a plant's mature spread, choose a density, and see how many plants will comfortably fit
Terrarium Humidity Guide
Choose your vessel type and plant category and get a target humidity range plus a suggested misting cadence for your room
Moss Coverage Calculator
Enter the floor area, pad size, and coverage now to see how many pads you need and how long a sparser planting takes to fill in
Drainage Layer Calculator
Work out the drainage material height and volume needed from floor area, substrate depth, and whether the pot has a drainage hole