For a typical home foot soak, a common guideline is to use about ½ cup of Epsom salt in a standard basin of warm water deep enough to cover your feet up to the ankles.

Quick Scoop: Basic Ratio

  • For a standard foot basin (around 3–4 liters / about 1 gallon): use about ½ cup (roughly 120 g) of Epsom salt.
  • For a larger tub or bucket: you can go up to 1 cup per gallon of water for a stronger soak, as long as your skin tolerates it.
  • Water should be warm, not hot, and high enough to cover your feet and ankles.

How to Do the Soak

  1. Fill a basin with warm water (enough to cover your feet up to the ankles).
  1. Stir in about ½ cup of Epsom salt until it fully dissolves.
  1. Soak your feet for 15–20 minutes.
  1. Pat feet dry and apply a moisturizer so the skin doesn’t dry out.

Some medical and clinic instructions use a lighter mix, such as 2 tablespoons of Epsom salt per quart of warm water, especially after foot procedures or for sensitive skin.

Safety Notes

  • Start with ½ cup per basin the first time; if your skin feels dry or irritated, reduce the amount next time.
  • Avoid very hot water, which can irritate or dry the skin.
  • If you have diabetes, poor circulation, open wounds, or a serious foot condition, check with a healthcare professional before using Epsom salt soaks.

TL;DR: Most people use about ½ cup of Epsom salt in a warm ankle‑deep basin for 15–20 minutes, adjusting up or down depending on basin size and skin sensitivity.

Information gathered from public forums or data available on the internet and portrayed here.