Free calculator ·
Ashwagandha Dosage Calculator
Add up how much ashwagandha you take each day from your product label, including withanolides, and see how it compares with the amounts used in research.
Quick answer
Multiply the amount per serving by your servings per day. For example, 2 capsules of 300 mg extract is 600 mg a day, the top of the 300 to 600 mg range used in most studies. At 5% withanolides, that is 30 mg of withanolides. Root powder is measured in grams and can't be compared with extract milligrams.
Your daily total
Extract per day
600 mg
2 servings × 300 mg
Withanolides per day
30 mg
5% of 600 mg
Within the studied range
Within the 300 to 600 mg a day of root extract used in most studies.
This adds up what your label says. It is not a dose recommendation, and the math stays in your browser.
Worked examples
The same math for common labels. A stronger extract can sit below the milligram range while providing as many withanolides as a standard one.
Daily ashwagandha totals compared with the 300 to 600 mg extract range
| Label and servings | Per day | Withanolides | Compared with studies |
|---|---|---|---|
| 1 × 300 mg extract at 5% withanolides | 300 mg | 15 mg | Within the studied range |
| 2 × 300 mg extract at 5% withanolides | 600 mg | 30 mg | Within the studied range |
| 1 × 500 mg extract at 5% withanolides | 500 mg | 25 mg | Within the studied range |
| 2 × 500 mg extract at 5% withanolides | 1,000 mg | 50 mg | Above the studied range |
| 2 × 125 mg extract at 10% withanolides | 250 mg | 25 mg | Below the studied range (stronger extract) |
| 2 × 1.5 g root powder | 3 g | Not listed | Not comparable (powder) |
How the calculator works
- Daily total = amount per serving × servings per day.
- Withanolides = daily total × withanolide % ÷ 100.
- Studied range: most trials of standardized root extract used 300 to 600 mg a day for 8 to 12 weeks. One 2012 trial gave 300 mg twice a day for 60 days, and a 2019 trial compared 250 mg and 600 mg a day for 8 weeks.
The extracts behind that range are often standardized to about 5% withanolides, which works out to roughly 15 to 30 mg of withanolides a day. If your label lists 10% or more, compare withanolides rather than milligrams.
Powder is different. Traditional root powder is far less concentrated, so the calculator keeps it in grams. See ashwagandha powder vs capsules for how the forms compare, and the ashwagandha dosage guide for ranges by goal.
Sources
- National Center for Complementary and Integrative Health. Ashwagandha
- Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine, 2012
- Salve J, Pate S, Debnath K, Langade D. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double-blind, randomized, placebo-controlled clinical study. Cureus, 2019
Frequently asked questions
How do I calculate my daily ashwagandha dose?
Multiply the amount in one serving by the number of servings you take each day. Two 300 mg capsules a day is 600 mg. If the label lists withanolides, multiply the daily total by that percentage: 600 mg at 5% is 30 mg of withanolides.
How much ashwagandha is used in studies?
Most studies of standardized root extract used 300 to 600 mg a day, usually for 8 to 12 weeks. That is a research range, not a personal recommendation.
What are withanolides?
Withanolides are natural compounds in ashwagandha root that are used to standardize extracts. A label that says 5% withanolides means 5 mg of withanolides in every 100 mg of extract.
Can I convert ashwagandha powder to extract milligrams?
No. Root powder is much less concentrated than extract, so a gram of powder is not the same as 1,000 mg of extract. Traditional use often describes about 1 to 6 grams of powder a day.
Is 1,000 mg of ashwagandha a day too much?
It is above the 300 to 600 mg a day used in most studies, and higher amounts are less studied. Talk with a doctor or pharmacist before taking more than your product label suggests.
Does this calculator recommend a dose?
No. It adds up what your label says and shows how that compares with amounts used in research. Ask a doctor or pharmacist what is right for you, especially if you are pregnant, take medication, or have a thyroid or autoimmune condition.
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