Converting a known concentration to volume
This tool starts with concentration, not total vial mass. Enter mg/mL or mcg/mL exactly as documented, then enter an independently established target in mg or mcg. It calculates volume and the equivalent U-100 marking without choosing the target.
If you know only total mass and final volume, first use the concentration worksheet. A label reading 10 mg total is not the same as 10 mg/mL. No amount count is shown here because the tool does not know total vial contents.
One calculation, two mass units
Arithmetic example: 0.25 mg ÷ 5 mg/mL = 0.05 mL. Entering 250 mcg and 5,000 mcg/mL produces the same volume. On a confirmed U-100 scale, 0.05 mL corresponds to 5 marked units. These example values are not suggested amounts.
target mg ÷ mg/mL = mL; mL × 100 = U-100Verify mass before reading markings
Reverse the calculation: 0.05 mL × 5 mg/mL = 0.25 mg. Changing only the number while leaving the wrong mass unit can introduce a thousand-fold error. Check both concentration units and target units before comparing results.
Limits and measurement precision
U-100 is a volume scale, not peptide activity. A result above 1 mL exceeds the modeled 100-unit capacity. Very small values use scientific notation rather than displaying zero; this does not mean a device can measure them. No dose, schedule, device or rounding decision is provided.
Questions and answers
Does this choose a dose?
No. The target remains your input. Medical suitability, product instructions and schedules require qualified guidance outside this calculator.
Why are vial mass and water absent?
They are unnecessary when concentration is already known. This avoids calculating concentration again from different or assumed inputs.
peptide dosage calculator formulas, sources, and limits
The sources below support the unit definitions or product-specific limitations discussed on this page. They do not endorse this website or validate an input. Check the current source and product documentation before relying on a calculation.
Updated 2026-10-23. Check the equations in our calculation methodology. Read the medical disclaimer before using any output in a health-related context.