Free supplement calculators
Make sense of
the small print.
Different units, serving sizes and prices. A few useful tools to put them on equal terms.
Compare supplement prices Free to use. No sign-up. The maths is always shown.Convert a label
Mcg to mg converter
Put two labels in the same units. Edit either box to convert between mcg and mg.
Mg to mcg converter
Put two labels in the same units. Edit either box to convert between mg and mcg.
Grams to mg converter
Put two labels in the same units. Enter an amount in g to see its equivalent in mg.
Mg to grams converter
Put two labels in the same units. Enter an amount in mg to see its equivalent in g.
Vitamin D IU to mcg converter
Match vitamin D labels across units. Convert IU to mcg using 1 microgram = 40 IU, for both D2 and D3.
Vitamin D mcg to IU converter
Match vitamin D labels across units. Convert mcg to IU using 1 microgram = 40 IU, for both D2 and D3.
Plan your protein
Compare the cost
Protein powder cost calculator
Different scoops. Different tubs. Compare two powders by the cost of the same 25 g of actual protein.
Supplement cost per serving calculator
Turn the bottle price into a cost per serving, a 30-day budget and the number of days it will last.
Creatine supply & cost calculator
See how long a tub of pure creatine will last and what it costs at your planned daily amount.
Omega-3 EPA + DHA cost calculator
Count EPA and DHA, not the weight of the oil. Find what a bottle costs per gram of these two omega-3s.
Put the numbers to work
Find the better-priced supplement.
Our catalog compares Amazon listings using consistent amounts of active ingredient.