basic

Hot Tub Fill Time Calculator

Minutes to fill a spa from a garden hose.

Estimate how long it takes to fill a hot tub from a garden hose, given the tub volume and the typical hose flow rate (5-9 GPM for a standard 5/8" hose).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

gal
GPM

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Minutes = tub_gallons / hose_gpm

In depth

Estimate how long it takes to fill a hot tub from a garden hose, given the tub volume and the typical hose flow rate (5-9 GPM for a standard 5/8" hose).