Calculators
Each tool is one formula with the working shown. They share the same inputs, so a number from one carries straight into the next.
Reconstitution calculator
Vial mg + water mL + amount per draw → mg/mL, mL and syringe units. The main tool.
mg ÷ mL, then amount ÷ concentration
Open →Syringe units converter
mL to units and units to mL on U-100 and U-40 scales, with barrel sizes.
mL × 100 = U-100 units
Open →Concentration calculator
mg/mL, mcg/mL and mcg per unit from a vial mass and a solvent volume.
mg ÷ mL = mg/mL
Open →Vial yield
How many draws of a given amount one vial holds, the exact fraction and the leftover.
vial mg ÷ mg per draw
Open →Cost per mg and per draw
Compare vials and multi-vial packs on price per milligram with shipping folded in.
(price + shipping) ÷ vials ÷ mg
Open →How much water to add
Work backwards from a target concentration or a target unit count to the mL to add.
mg ÷ target mg/mL = mL
Open →Blend calculator
Two peptides in one vial: units for the first and how much of the second comes with it.
each mass ÷ shared mL
Open →Which tool when
Start with the reconstitution calculator if you have a vial, a volume and an amount in mind; it answers the whole question at once. Use the water calculator when you want to choose the volume so that a given amount lands on a round unit count. Use vial yield and cost per mg when comparing sizes and packs before an order, and the blend calculator for vials that carry two peptides on one label.