Conversor de mcg para mg
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
1 mg = 1000 mcg
About this calculator
The mcg to mg Converter is a free online tool that instantly converts values from micrograms (mcg) to milligrams (mg). Since 1 milligram equals 1000 micrograms, the conversion is done by dividing the mcg value by 1000. For example, 5000 mcg equals 5 mg. This calculator is useful for healthcare professionals, patients, nutritionists, and anyone who needs to handle dosages of medications, supplements, or lab tests.
The formula is simple: mg = mcg ÷ 1000. Just enter the value in micrograms and click 'Convert'. The result appears in milligrams with precision. The tool can also perform the reverse conversion (mg to mcg) by multiplying by 1000. Micrograms and milligrams are metric mass units commonly used in pharmacology and nutrition to quantify small amounts of active substances.
You should use this converter whenever you need to interpret medication labels, prescriptions, or supplement labels that use micrograms (mcg) and you want the equivalent in milligrams (mg). For instance, if a vitamin B12 supplement contains 1000 mcg, that equals 1 mg. Or if a medication prescribes 0.5 mg, you can verify that it is 500 mcg. The tool prevents calculation errors that could compromise proper dosing.
Important precautions: always double-check that the input unit is correct (mcg or mg). Conversion errors can lead to underdosing or overdosing, especially with high-potency medications. Remember that 1 mg = 1000 mcg, not the reverse. For very small values like 0.1 mcg, the result will be 0.0001 mg. Use the tool carefully and consult a doctor or pharmacist if you have dosage questions.
Frequently asked questions
How many mcg are in 1 mg?
1 mg equals 1000 mcg. To convert mg to mcg, multiply by 1000.
How do I convert 2500 mcg to mg?
Divide 2500 by 1000: 2500 mcg = 2.5 mg.
Can this calculator be used for medications?
Yes, it is ideal for converting medication and supplement dosages from mcg to mg, but always consult a healthcare professional.
What is the difference between mcg and mg?
Mcg stands for microgram (one-thousandth of a milligram) and mg stands for milligram (one-thousandth of a gram). 1 mg = 1000 mcg.
Can I convert mg to mcg with this tool?
Yes, simply enter the value in mg and multiply by 1000 mentally, or use the reverse function if available.