How Long Does It Take To Fill A Pool - Fill Time Calculator

Want to know how long it will take to fill up your swimming pool or spa? Enter your pool dimensions and water flow rate below to calculate your pool fill time!

Pool Fill Time Calculator

Time Taken To Fill: 0.00 hours (0.0 days)

Why Calculate Pool Fill Time?

Initial Fill After Construction

If you've just finished construction of your brand new swimming pool or spa, you'll probably want to fill it up and go for a dip as soon as possible!

However, once you start filling your pool with your garden hose, you'll quickly realise that it's going to take a lot longer than you thought to fill it up!

By using this fill rate calculator, you can quickly get a feel for how long it will take to fill up your pool and have it ready for swimming! If it's going to take a lot longer than you thought, you might want to look into paying someone to deliver a truckload of water to your house so that you can fill it instantly.

Refilling The Pool After Draining

Occasionally, you'll want to drain your pool so that you can pressure or acid wash the walls and clean any stains that have accumulated.

Or perhaps you've let your pool go over winter and it's too far gone to recover so you're better off draining it and refilling it.

This calculator will give you a good feel for how long it will take to refill.

Topping Up Your Pool After Evaporation

Over a long dry spell, your swimming pool can lose a surprising amount of water to evaporation. This calculator can let you know how long it will take to refill the pool back up to its normal water level.

How Long Does It Take To Fill A Pool With A Garden Hose?

From Empty

The average backyard swimming pool in Australia has dimensions of 8m length, 4m width and 1.7m depth. To fill this up from empty requires about 54,000 L of water.

According to the NT government, the typical supply to a house is around 0.25 L/s (litres per second).

At this flow rate , it will take about 218 hours (9.1 days) to fill your pool up.

Topping Up

For the same 54,000 L pool above, if you need to top it up with 10cm of water to make up for evaporation loss, you will need just 3,200 L of water, which will take about 13 hours at a flow rate of 0.25 L/s.


I hope this pool fill time calculator (in litres) proves useful for you!

Please keep in mind that this calculator doesn't consider water losses to evaporation - to do that you'll need to use this pool evaporation calculator.

Have you noticed any issues or have any features you want me to add? Get in touch over at the contact page!

Louis from Pool Advisor


A chemical engineer by trade, Louis is committed to debunking myths in the pool industry by explaining the underlying chemistry and making it accessible to all.