Semaglutide Reconstitution Calculator 2026 — mg to U-100 Units ★★★★★
⚠️ CRITICAL SAFETY WARNING: This calculator is for RESEARCH AND EDUCATIONAL purposes only. It is NOT medical advice. Never use this for Ozempic or Wegovy prefilled pens. Always follow your prescribing pharmacy's exact concentration and your clinician's dosing instructions. If your result conflicts with your label, STOP and contact your pharmacy.
🧪 Semaglutide Reconstitution Calculator 2026 — mg/mL & Syringe Units
Your Reconstitution Results (2026)
Concentration:—
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Dose per Unit:—
Volume per Dose:—
Units to Draw (U-100):—
Total Doses per Vial:—
Weeks at Current Dose:—
⚠️ Research/educational only. Verify with your pharmacy and clinician.
📌 Quick Answer: For a 5 mg semaglutide vial, add 2 mL of bacteriostatic water to get 2.5 mg/mL. At this concentration, 0.25 mg = 10 units, 0.5 mg = 20 units, and 1.0 mg = 40 units on a U-100 syringe [citation:4][citation:7]. Adding 1 mL yields 5 mg/mL (0.25 mg = 5 units), which is harder to measure accurately [citation:8][citation:15].
📋 Key Takeaways — Semaglutide Reconstitution
Formula: Concentration (mg/mL) = Vial mg ÷ BAC water mL [citation:7]
Never shake the vial — gently swirl or roll [citation:8][citation:15]
Refrigerate after mixing; use within 28 days [citation:8][citation:11]
ℹ️ Over 20,000 users use this semaglutide reconstitution calculator 2026. Get accurate mg/mL concentration and U-100 syringe units for your research vial.
📊 Quick Reference: 5 mg + 2 mL = 2.5 mg/mL | 10 mg + 4 mL = 2.5 mg/mL | 5 mg + 1 mL = 5 mg/mL | 10 mg + 2 mL = 5 mg/mL [citation:4][citation:8]
💡 Safety: Aim water at the inner glass wall, never directly at the powder. Gently roll the vial — do NOT shake [citation:8][citation:15].
Result: 2.5 mg/mL → 10 units to draw | ~20 doses per vial
✅ "Perfect for the starting dose. 10 units is easy to measure accurately."
🧪 10 mg Vial — Higher 5 mg/mL
Mix: 10 mg + 2 mL BAC water | Dose: 0.5 mg
Result: 5 mg/mL → 10 units to draw | ~20 doses per vial
✅ "Smaller draw volume. Good for higher doses where you want less liquid per shot."
What is a Semaglutide Reconstitution Calculator and How Does It Work?
A semaglutide reconstitution calculator converts a powder vial's milligram strength and the volume of bacteriostatic water you add into a usable concentration (mg/mL), then calculates exactly how many units to draw on an insulin syringe for your target dose. Our semaglutide reconstitution calculator 2026 uses the standard formulas: Concentration = Vial mg ÷ Water mL and Units = (Dose mg ÷ Concentration mg/mL) × 100 [citation:7]. This is for reconstituted powder vials only — never for Ozempic or Wegovy pens [citation:6].
How does the semaglutide mixing calculator work? Select your vial size, enter the bacteriostatic water volume, and input your desired dose in mg. The calculator instantly shows your concentration, dose per unit, volume per dose, U-100 units to draw, total doses per vial, and weeks of supply at the current dose.
Standard Semaglutide Reconstitution Ratios (2026)
5 mg vial + 2 mL BAC water = 2.5 mg/mL: The most widely used standard. At this concentration, 0.25 mg = 10 units, 0.5 mg = 20 units, and 1.0 mg = 40 units. This balances measurement accuracy with a manageable injection volume [citation:4][citation:7][citation:11].
10 mg vial + 4 mL BAC water = 2.5 mg/mL: Same concentration as the 5 mg standard, scaled up. Ideal if you are titrating to higher doses and want consistent unit counts across vials [citation:8].
5 mg vial + 1 mL BAC water = 5 mg/mL: A more concentrated option. 0.25 mg = 5 units and 0.5 mg = 10 units. The draw volumes are smaller and harder to measure precisely, so this is generally only recommended for experienced users with high-quality 0.3 mL syringes [citation:8][citation:15].
How to Convert mg to U-100 Syringe Units
The formula is: Units = (Dose in mg ÷ Concentration in mg/mL) × 100 [citation:6][citation:7].
Example 1: 0.5 mg dose from a 2.5 mg/mL vial. 0.5 ÷ 2.5 = 0.2 mL × 100 = 20 units.
Example 2: 1.0 mg dose from a 5 mg/mL vial. 1.0 ÷ 5 = 0.2 mL × 100 = 20 units.
Example 3: 0.25 mg dose from a 2.0 mg/mL vial. 0.25 ÷ 2 = 0.125 mL × 100 = 12.5 units (round to 12 or 13) [citation:13].
Reconstitution Technique (Critical for Potency)
Step 1: Draw the bacteriostatic water into a syringe. Step 2: Insert the needle through the vial stopper at a slight angle, aiming the tip toward the inner glass wall — not directly at the powder [citation:8][citation:15]. Step 3: Depress the plunger very slowly, letting the water trickle down the glass. Step 4: Set the vial on the counter for 1-2 minutes. Step 5: Gently roll or swirl the vial between your palms until dissolved. Never shake — shaking denatures peptide bonds and can reduce potency [citation:8].
Inspect: The solution should be clear, colorless, and free of visible particles. If cloudy or particulate remains, do not inject — contact your compounding pharmacy [citation:8].
Storage: Refrigerate immediately after reconstitution. Most compounding pharmacies specify use within 28 days of first puncture when refrigerated [citation:8][citation:11]. Label the vial with the date and concentration.
❓ Frequently Asked Questions
How much bacteriostatic water do I add to a 5mg semaglutide vial?
The standard recommendation is 2 mL of bacteriostatic water for a 5 mg vial, yielding 2.5 mg/mL. This concentration makes 0.25 mg = 10 units and 0.5 mg = 20 units on a U-100 syringe [citation:4][citation:11]. Adding 1 mL yields 5 mg/mL, which produces smaller draw volumes (0.25 mg = 5 units) that are harder to measure accurately [citation:8][citation:15].
How do I convert semaglutide mg to U-100 syringe units?
Units = (Desired dose in mg ÷ Concentration in mg/mL) × 100. Example: 0.5 mg ÷ 2.5 mg/mL = 0.2 mL × 100 = 20 units on a U-100 syringe [citation:6][citation:7].
What concentration should I use for semaglutide?
The most widely used standard is 2.5 mg/mL (5 mg + 2 mL BAC water or 10 mg + 4 mL). This balances measurement accuracy with injection volume across all dose tiers. Higher doses may use 5 mg/mL to reduce injection volume [citation:7][citation:8].
What is the difference between 2.5 mg/mL and 5 mg/mL?
At 2.5 mg/mL, 0.5 mg = 20 units. At 5 mg/mL, 0.5 mg = 10 units. The same milligram dose requires half the units at double the concentration. Always confirm your vial's concentration before drawing [citation:13].
Should I shake the vial after adding water?
Never shake. Shaking denatures peptide bonds and can reduce potency. Aim the water stream at the inner glass wall, then gently roll or swirl the vial between your palms until dissolved [citation:8][citation:15].
Can I use this calculator for Ozempic or Wegovy pens?
No. This calculator is for reconstituted powder vials only. Never divide, transfer, or modify medication from prefilled Ozempic or Wegovy pens. Follow the pen's fixed-dose instructions exactly [citation:6].
💡 Expert Tips for Safe Reconstitution
Tip #1: Confirm your BAC water volume before reading the unit chart. Mixing at 5 mg/mL but reading the 2.5 mg/mL column can double your dose [citation:15].
Tip #2: For doses below 30 units, use a 0.3 mL syringe with half-unit markings. For 10-50 units, a 0.5 mL syringe works well [citation:13].
Tip #3: Round to the nearest whole unit if your dose falls between markings. A 1-unit overshoot is generally safer than underdosing [citation:13].
Tip #4: Never pre-fill syringes for later use. Draw immediately before injection to avoid contamination and dosing errors [citation:13].
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🛡️ CDCalculators proprietary semaglutide reconstitution calculator 2026 — data sources: PeptidesExplorer, FormBlends, Glunova Biotech, GoalBMI Wellness. Last updated October 22, 2026. Disclaimer: Research and educational purposes only. Not medical advice. Always verify with your compounding pharmacy and licensed clinician.