How To Convert Milligrams To Teaspoons: 7 Steps (with Pictures)

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Convert Milligrams to Teaspoons Reviewed by Anne Schmidt

Last Updated: January 27, 2026 Fact Checked

  • Converting Milligrams to Milliliters
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  • Converting Milliliters to Teaspoons
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This article was reviewed by Anne Schmidt. Anne Schmidt is a Chemistry Instructor in Wisconsin. Anne has been teaching high school chemistry for over 20 years and is passionate about providing accessible and educational chemistry content. She has over 9,000 subscribers to her educational chemistry YouTube channel. She has presented at the American Association of Chemistry Teachers (AATC) and was an Adjunct General Chemistry Instructor at Northeast Wisconsin Technical College. Anne was published in the Journal of Chemical Education as a Co-Author, has an article in ChemEdX, and has presented twice and was published with the AACT. Anne has a BS in Chemistry from the University of Wisconsin, Oshkosh, and an MA in Secondary Education and Teaching from Viterbo University. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 115,705 times.

A milligram is a measure of mass in the SI (metric) system, while a teaspoon is a measure of volume in the English system. Therefore, this conversion from milligrams to teaspoons requires two stages. First you will need to find the density of the material you are measuring. You will use the density to convert from mass to volume, or milligrams to milliliters. You will then convert from the SI volume measurement milliliters to the English system measurement teaspoons.

Steps

Part 1 Part 1 of 2:

Converting Milligrams to Milliliters

  1. Step 1 Find the density of the material you are measuring. 1 Find the density of the material you are measuring. Because you are trying to convert mass into volume, you need to know the density of the material. Density is a measurement of how much mass fits in a given volume for any substance. Materials that we consider "heavy" have a high density, while "light" materials have a low density.[1]
    • Density tables exist online or in many text books for a wide range of substances. You can find a table of density values by searching for “density table,” “liquid density table,” or “solid density table.”
    • The density of pure water is set at 1000 kg per cubic meter. This is the same as 1000 mg/ml.
    • For comparison, some other common liquids have the following densities:[2]
      • Alcohol = 800 kg/m3=800 mg/ml
      • Gasoline = 737 kg/m3=737 mg/ml
      • Milk = 1050 kg/m3=1050 mg/ml
      • Mercury = 13590 kg/m3=13590 mg/ml
  2. Step 2 Check with your pharmacist for medication densities. 2 Check with your pharmacist for medication densities. If you are trying to convert amounts for a prescription, you should check with your pharmacist. A pharmacist is in the best position to provide you with the correct density of whatever compound you need to measure.
    • You may find the density of your substance printed on the bottle. You might check that before contacting the pharmacist.
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  3. Step 3 Prepare to convert from mass to volume. 3 Prepare to convert from mass to volume. Recall that density is equal to an item’s mass divided by its volume. Rearranging this formula.[3]
    • Volume = mass density {\displaystyle {\text{Volume}}={\frac {\text{mass}}{\text{density}}}} .
  4. Step 4 Perform the conversion. 4 Perform the conversion. When you know the density of the material and the measurement of the sample you wish to convert, perform the division to convert from mass to volume of your substance.[4]
    • For example, suppose you wish to convert 20,000 milligrams each of water, alcohol, gasoline, milk and mercury into milliliters. 20,000 milligrams is equal to 20 grams, which is about the weight of 20 paper clips. The conversions for these five liquids are as follows:
      • Water: ( 20 , 000  mg ) / ( 1000  mg/ml ) = 20  ml water {\displaystyle (20,000{\text{ mg}})/(1000{\text{ mg/ml}})=20{\text{ ml water}}}
      • Alcohol: ( 20 , 000  mg ) / ( 800  mg/ml ) = 25  ml alcohol {\displaystyle (20,000{\text{ mg}})/(800{\text{ mg/ml}})=25{\text{ ml alcohol}}}
      • Gasoline: ( 20 , 000  mg ) / ( 737  mg/ml ) = 27.137  ml gasoline {\displaystyle (20,000{\text{ mg}})/(737{\text{ mg/ml}})=27.137{\text{ ml gasoline}}}
      • Milk: ( 20 , 000  mg ) / ( 1050  mg/ml ) = 19.048  ml milk {\displaystyle (20,000{\text{ mg}})/(1050{\text{ mg/ml}})=19.048{\text{ ml milk}}}
      • Mercury: ( 20 , 000  mg ) / ( 13590  mg/ml ) = 1.4717  ml mercury {\displaystyle (20,000{\text{ mg}})/(13590{\text{ mg/ml}})=1.4717{\text{ ml mercury}}}
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Part 2 Part 2 of 2:

Converting Milliliters to Teaspoons

  1. Step 1 Learn the conversion factor. 1 Learn the conversion factor. Because milliliters and teaspoons are both measurements of volume, the density of the different materials no longer makes a difference. Converting from milliliters to teaspoons is fairly easy because the conversion factor is just 5 to 1. That is, 5 ml = 1 tsp.[5]
    • If you know a measurement in milliliters, you can convert to teaspoons by just dividing by 5.
  2. Step 2 Perform the conversion. 2 Perform the conversion. Using the five samples from above, prepare for the conversion to teaspoons.
    • Water: 20,000 mg = 20 ml/5 = 4 teaspoons
    • Alcohol: 20,000 mg = 25 ml/5 = 5 teaspoons
    • Gasoline: 20,000 mg = 27.137 ml/5 = 5.4274 teaspoons
    • Milk: 20,000 mg = 19.048 ml/5 = 3.8096 teaspoons
    • Mercury: 20,000 mg = 1.4717 ml/5 = 0.29434 teaspoons
  3. Step 3 Review the results. 3 Review the results. Pure water is set as the standard for conversion density, with a density of 1.0 grams per milliliter. The densities of all other substances are set in relation to the density of water. Notice that mercury, with an extremely high density, converts to only about a quarter teaspoon for the same mass of water that equals one teaspoon.[6]
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Community Q&A

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  • Question How many teaspoons are in 10 mg of fiber? Donagan Donagan Top Answerer As indicated above, you have to know the density of the material before you can answer that question. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 6 Helpful 6
  • Question How many teaspoons is 400 mg of turmeric? Donagan Donagan Top Answerer There are roughly 2,267 mg of turmeric in a teaspoon, so 400 mg would be about 0.176 tsp (one-sixth of a teaspoon). (A teaspoon is slightly different in Australia.) Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 5 Helpful 20
  • Question How do I convert milligrams to meters? Donagan Donagan Top Answerer Milligrams measure mass, and meters measure length, so one does not convert to the other. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 5 Helpful 3
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Tips

  • After you get good at converting, you can perform this conversion quite quickly. Divide the number of milligrams by the density (in mg/ml), then divide by 5 to get teaspoons. Thanks Helpful 0 Not Helpful 0
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References

  1. ↑ https://www.inchcalculator.com/convert/milligram-to-teaspoon/
  2. ↑ https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_Slurry_Transport_(Miedema)/11%3A_Appendices/11.02%3A_Appendix_B-_List_of_Liquid_Densities
  3. ↑ https://www.omnicalculator.com/physics/volume-to-mass
  4. ↑ https://www.thecalculatorsite.com/articles/units/convert-mg-to-ml.php
  5. ↑ https://www.omnicalculator.com/conversion/ml-tsp-converter
  6. ↑ https://www.sfu.ca/phys/demos/demoindex/fluids/fl2b/density.html

About This Article

Anne Schmidt Reviewed by: Anne Schmidt Chemistry Instructor This article was reviewed by Anne Schmidt. Anne Schmidt is a Chemistry Instructor in Wisconsin. Anne has been teaching high school chemistry for over 20 years and is passionate about providing accessible and educational chemistry content. She has over 9,000 subscribers to her educational chemistry YouTube channel. She has presented at the American Association of Chemistry Teachers (AATC) and was an Adjunct General Chemistry Instructor at Northeast Wisconsin Technical College. Anne was published in the Journal of Chemical Education as a Co-Author, has an article in ChemEdX, and has presented twice and was published with the AACT. Anne has a BS in Chemistry from the University of Wisconsin, Oshkosh, and an MA in Secondary Education and Teaching from Viterbo University. This article has been viewed 115,705 times. 92 votes - 25% Co-authors: 3 Updated: January 27, 2026 Views: 115,705 Categories: Conversion Aids In other languages Portuguese Spanish German Japanese
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Anne Schmidt Reviewed by: Anne Schmidt Chemistry Instructor 92 votes - 25% Click a star to vote 25% of people told us that this article helped them. Co-authors: 3 Updated: January 27, 2026 Views: 115,705

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