# Garden Water Tank Calculator

Estimate usable storage, daily consumption and refill interval.

[Open this tool](https://whatson.pk/gardening-tank-days-calculator/)

Category: Gardening

A water tank provides storage days only in relation to the garden's daily draw.

Enter usable storage and a constant consumption estimate, then compare the refill interval.

## Inputs and controls

* Tank capacity (L). Allowed range: 0.1 to 100000000
* Unavailable reserve (%). Allowed range: 0 to 99.99
* Garden water use (L/day). Allowed range: 0.001 to 100000000
* Other daily draw (L/day). Allowed range: 0 to 100000000

## How to use

* Enter tank capacity and unavailable reserve.

* Enter garden water use and other daily draw.

* Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

The result distinguishes tank capacity from the number of watering days it can support.


## Before relying on the result

Assumes constant daily draw and no incoming water. Stored rainwater and drinking water need separate suitability checks.


## Tool limitations

Assumes constant daily draw and no incoming water. Stored rainwater and drinking water need separate suitability checks.

## Questions

### Is incoming water included?

No. The model assumes no incoming supply during the counted period.

### What should I check before using Garden Water Tank Calculator?

Check Tank capacity, Unavailable reserve, Garden water use and Other daily draw. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T13:08:12+00:00

This profile describes the tool. It does not execute it or supply a professional certification.