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CALCULATOR
Same amount. Different units.
Convert between international units (IU) and micrograms (µg or mcg). This conversion is for vitamin D only.
Your result
This is arithmetic, not a recommendation for how much to take. A higher number does not mean a better choice.
How the calculation works
For vitamin D, multiply micrograms by 40 to get IU. Divide IU by 40 to get micrograms. Source: NHS vitamin D guidance.
For questions about your dose, medication or a blood test, speak to a pharmacist or clinician.
CALCULATOR
What does a pack cost per day?
Use the daily serving printed on the label. Compare products with suitable ingredients and strengths, not price alone.
Your result
A unit means one tablet, capsule or gummy. If directions give a range, calculate both ends. Delivery should be the amount allocated to this pack.
How the calculation works
Days per pack = units in pack ÷ units per day. Daily cost = (pack price + delivery) ÷ days per pack. A 60-unit pack at two units a day lasts 30 days.
SAVE FOR THE NEXT PACK
The supplement label checklist.
A practical reference from SupplementMe. Check the actual pack before use: product descriptions and prices can change.
- Start with the daily serving. Is the amount shown per tablet, per gummy or per daily serving? Two units a day means a 60-unit pack lasts 30 days.
- Keep the units consistent. Milligrams (mg) and micrograms (µg or mcg) are different. For vitamin D only, 1 µg = 40 IU. Do not apply that IU conversion to other vitamins.
- Read the full ingredient list. Check ingredients and allergen information on the pack. A nutrient name on the front does not tell you everything in the product.
- Check dietary suitability explicitly. Vegetarian does not mean vegan. Look for a clear suitability statement and ask the manufacturer if the source of an ingredient is unclear.
- Compare the full cost. Divide pack price plus relevant delivery by days per pack. Check whether a headline offer requires multiple packs, a subscription or a membership.
- Read directions and cautions. Follow the stated dose. If you take medication, have a medical condition or are unsure whether a supplement is appropriate, ask a pharmacist or clinician.
- Keep product facts separate from promises. A larger amount, a higher price or a customer testimonial does not establish that a product is better for you.
Keep reading
SupplementMe's full label-reading guide · Use the calculators
Sources and authorship
Published by SupplementMe, a brand that sells supplements. This checklist is general label-reading information, not a personalised recommendation or clinical review. Prepared 15 September 2026.
Made by SupplementMe.
We sell supplements, so this is a brand-published resource. The tools calculate the figures you enter. They do not choose a product or dose for you.
Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle. Calculator entries stay in your browser.