Herbal Infusion Strength Calculator

Herbal infusions are water-based preparations of herbs, what most people call “tea.” Different intended uses call for different ratios and times: a light beverage tea uses much less herb than a medicinal nourishing infusion of the same plant.

Standard herb-to-water ratios:

Light beverage (1-3 min): 1 teaspoon dried herb per 1 cup water. The classic “cup of tea” ratio.

Moderate medicinal (10-15 min): 1 tablespoon dried herb per 1 cup water. Used for traditional remedy teas like chamomile for sleep, ginger for nausea, peppermint for digestion.

Strong infusion (30 min - 4 hours): 1 ounce (28 g, about a loosely packed cup) of dried herb per 1 quart (4 cups) of water. The strength used for serious medicinal work: mullein for respiratory, oat straw for nervous system, red raspberry leaf for women’s health.

Nourishing infusion (4-8 hours): the same 1 ounce per quart, steeped for 4-8 hours (usually overnight). The nutrient-extraction approach popularized by Susun Weed for nettle, oat straw, red clover, and other mineral-rich plants. Long steeping pulls calcium, magnesium, and water-soluble vitamins that short steeps miss entirely.

Form adjustments:

Fresh herbs: use about 3× the dried amount (about 3 tablespoons fresh = 1 tablespoon dried). Fresh herbs are mostly water by weight.

Roots and barks (ginger, valerian, marshmallow root, slippery elm): decocted, meaning simmered for 20 to 45 minutes, rather than infused. Hard plant material gives its compounds up slowly.

The ratio is not the same as an infusion, and this is where a lot of recipes online go wrong. A decoction runs at about 1 part herb to 8 parts water by weight. Even the strong overnight infusion above is only about 1:33. So the same 28 grams of material that would flavor a full quart as an infusion goes into roughly a cup of water as a decoction. Four times the concentration, and a different method. Use the decoction calculator for those.

Delicate leaves (peppermint, lemon balm, chamomile): keep steep times shorter (5-10 minutes max) to avoid bitter tannins. Cover the cup or pot during steep to retain volatile aromatic oils.

Worked example: nourishing infusion of nettle for minerals.

• 1 oz (about 1 cup loose) dried nettle leaves
• 1 quart (4 cups) boiling water
• Pour over nettles in a quart jar, cover with a lid
• Steep at room temperature for 4-8 hours (overnight is easy)
• Strain. Drink chilled or warmed throughout the next day.

The result is dark green, slightly grassy, mineral-rich. Tastes very different from a 5-minute nettle “tea”, and it carries 5-10× more calcium and other minerals.

Why steep time matters more than people realize:

• Volatile aromatics (lavender, peppermint, chamomile): peak around 5 minutes; longer extracts more bitter compounds
• Tannins (most leaves): build with longer steep, contributing astringency and slight bitterness
• Minerals (calcium, magnesium): require hours to extract significantly
• Mucilaginous compounds (marshmallow, slippery elm): extract better in cold water over hours

For specific herbs, traditional usage often dictates the method. Don’t apply nourishing infusion times to delicate aromatic herbs. You will get a bitter, unpleasant result. Don’t use light beverage method for mineral-rich plants either. You will waste 90% of what they offer.

Storage: prepared infusions keep 24-36 hours refrigerated. After that, fermentation begins (mostly harmless but flavor degrades). For longer storage, prepare daily or freeze in ice cube trays.