How long to fill a pool with a hose?

At ~9 GPM, about 37 hours per 20,000 gallons. Enter your numbers and real hose flow for an estimate.

How can I fill faster?

Use multiple hoses, a larger-diameter hose, or ask about a bulk water-delivery service for big pools.

Pool Fill Time Calculator — How Long to Fill Your Pool (Free)

Pool Fill Time Calculator

Filling a new pool or topping off after a drain? Enter your volume and hose flow to estimate the time.

Balance your whole pool at once →Enter all your readings on one screen and get an ordered dosing plan — the full Water Report.

Add this calculator to your site — free

Paste it anywhere on your site. It includes a small credit link back to the full tool.

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<p style="font:13px system-ui,sans-serif;margin:6px 0 0">Free <a href="https://poolchemlab.com/pool-fill-time-calculator/">Pool Fill Time Calculator</a> by <a href="https://poolchemlab.com/">PoolChemLab</a></p>

How to use it

Measure your hose's flow: time filling a 5-gallon bucket, then GPM = 5 ÷ minutes.
Enter that and the gallons to fill.
Don't leave a filling pool fully unattended overnight on a meter you don't want to overrun.

Tips for filling

Two hoses roughly halve the time. If you're on metered water, ask your utility about a pool-fill credit (some waive sewer charges for water that doesn't enter the sewer). Add a hose filter to keep metals out of fresh fill water.

Frequently asked questions

How long to fill a pool with a hose?: At ~9 GPM, about 37 hours per 20,000 gallons. Enter your numbers and real hose flow for an estimate.
How can I fill faster?: Use multiple hoses, a larger-diameter hose, or ask about a bulk water-delivery service for big pools.

Related calculators

Built & reviewed by a working pool-service pro. Target ranges follow CDC MAHC, PHTA, and Taylor guidance. Doses are starting estimates — add a little less than the max, re-test, and confirm against your product label. Educational tool, not a substitute for a water test or professional advice.