How to set a watering routine
Combine plant type, pot size and light into a starting schedule.
Identify the plant
Choose the closest plant type and note whether it stores water in its leaves.
Check the pot and light
Small pots in bright light dry fastest; large pots in low light stay wet longest.
Enter the last watering
Use the date you last watered to get the next reminder and a starting volume.
What does this tool do?
Watering frequency depends on the plant, the pot and the light it receives, and most houseplants fail from too much water rather than too little. This calculator turns those factors into a rough interval and a water volume, then dates the next watering from the last one.
The Formula
Interval = base days by plant type × light factor × season factor; volume ≈ 15% of pot volumeFrequently Asked Questions
Should I water on a fixed schedule?
Use the interval as a reminder, then check the soil first. Water when the top few centimetres are dry rather than on the calendar alone.
Why does pot size change the interval?
A larger pot holds more soil and water, so it dries more slowly. Small pots may need water every few days while large ones can go weeks.