1. Top width: Measure the width of the top of your container; only measure the plantable area. Match this to the drop-in planter width without going over. See the first measurement for the product description above.
2. Bottom width: Measure the narrowest width inside your container. Make sure that it is larger than the width of the bottom of your drop-in planter. See the second measurement in the product description above.
3. Height: Measure down to the height of your drop-in. Now, measure the width in your container at the height of the drop-in product. Make sure that it is larger than the width of the bottom of your drop-in planter. This ensures that your drop-in will not stick out above your container. The third measurement is the height in the product description above.