Skip to content
    Inner Circle LabsICL Labs
    Research tools

    Peptide dosing calculators

    Four practical tools — reconstitution to insulin-syringe units, click-dial pen conversions, mg ↔ mcg ↔ IU conversion, and how long a vial lasts. For research and education; not medical advice.

    Medically reviewed byICL Medical TeamLast reviewed 23 May 2026Medical disclaimer

    Reconstitution calculator

    Mix a lyophilized vial with bacteriostatic water and find out how many units to draw on an insulin syringe for your target dose.

    Concentration
    5 mg/mL
    5,000 mcg/mL
    Volume per dose
    0.05 mL
    Draw on syringe
    5 units
    of 100 max

    Math: units = (target mcg ÷ (mg ÷ mL ÷ 1000)) × 100. Assumes a standard U-100 insulin syringe (1 mL = 100 units).

    Pen calculator

    For click-dial pens (e.g. compounded retatrutide, semaglutide, tirzepatide). Pick a preset or enter your pen's mg and total units, then it figures out the click count for any target dose.

    Clicks to dial
    20 clicks
    200 mcg per click
    Doses per pen
    10
    at 4 mg / dose
    Total clicks in pen
    200
    Concentration
    13.33 mg/mL

    Math: mg per click = reference mg ÷ reference clicks. Clicks for a new dose = target mg ÷ mg per click. Always confirm against the pen's actual labeling — click ratios vary by manufacturer.

    Unit converter

    Convert between mg, mcg, and IU. IU only applies to peptides with a defined IU/mg (e.g. growth hormone ≈ 3 IU/mg).

    mg
    1
    mcg
    1,000
    IU
    3

    Vial duration

    How long a single vial lasts at your dosing schedule. Useful for planning reorders and cycle length.

    Doses per vial
    40
    Lasts
    5.7 weeks
    ≈ 40 days
    Per-dose cost share
    —
    Multiply weeks by your vial price

    Safety note. These calculators only do arithmetic — they don't know anything about your specific protocol, vial purity, sterility, or contraindications. Always confirm dosing with a qualified clinician before any human use.