Example 1
- Vial: 5 mg
- Diluent: 2 mL
- Dose: 250 mcg
- Units/mL: 100
0.1000 mL, 10.0 units, 2.5000 mg/mL
5 / 2 = 2.5 mg/mL, and 0.250 mg / 2.5 gives 0.1000 mL and 10.0 units.
Peptide calculator
Type milligrams in the vial, milliliters of diluent, and micrograms to convert. The calculator divides masses by volumes. 5 mg in 2 mL at 250 mcg is 0.1000 mL.
Concentration = mg / mL, volume = (mcg / 1000) / concentration. Paper arithmetic. Another kcal sketch: calorie deficit.
Result
Amount in the vial (mg), Diluent (mL), Dose you want (mcg) and Syringe units per 1 mL (blank = 100). Dose volume shows up here.
How it works
This calculator does concentration arithmetic. You divide milligrams in the vial by milliliters of diluent and get milligrams per milliliter. You divide micrograms by 1000 to get milligrams, then divide by concentration to get milliliters. Syringe units are those milliliters times how many ticks fall on 1 mL.
A blank units field inserts 100. 5 mg in 2 mL is 2.5 mg/mL. 250 mcg is 0.250 mg, 0.250 / 2.5 = 0.1000 mL and 10.0 units on a 100 scale.
People come here looking for a clinic dose. The calculator does not pick a substance, does not judge safety, and does not describe a needle, a site, or sterility. You type three numbers for division, and maybe a syringe scale. 10 mg in 1 mL and 500 mcg give 0.0500 mL and 5.0 units. 2 mg in 2 mL and 200 mcg give 0.2000 mL and 20.0 units. 5 mg in 1 mL and 100 mcg give 0.0200 mL and 2.0 units.
Every quantity except the scale must be greater than zero. An empty vial, empty diluent, or empty mcg stops the math. The calculator does not guess 5 mg and 2 mL. Volume keeps four decimals, units one, concentration four, so 0.0200 mL does not vanish as zero. The metric or US switch does not turn milliliters into ounces.
A different scale changes only the ticks, not the milliliters. 10 mg in 2 mL and 250 mcg is 5 mg/mL and 0.0500 mL. At 50 ticks per milliliter that is 2.5 units. 10 mg in 4 mL and 200 mcg is 2.5 mg/mL and 0.0800 mL. On a 40 scale that is 3.2 units. 5 mg in 2.5 mL and 500 mcg is 2 mg/mL and 0.2500 mL, 25.0 units at 100. 1 mg in 1 mL and 100 mcg with a blank scale is 0.1000 mL and 10.0 units.
Treat 0.1000 mL as a denominator exercise for class, not as a clinical protocol. Type 5, 2, and 250, click Calculate, and check 2.5000 mg/mL and 0.1000 mL. Then leave units blank to see the inserted 100.
How to use
- Type milligrams in the vial and milliliters of diluent, both greater than zero. A comma and a period both parse.
- Type the micrograms whose volume you want. That field is a number for the formula, not a clinic recommendation.
- Leave units per 1 mL blank to use 100, or type 40 or 50 if that is the scale.
- Read concentration in mg/mL, volume in milliliters to four places, and units to one place.
- Check 5 mg, 2 mL, and 250 mcg: 2.5000 mg/mL, 0.1000 mL, and 10.0 units at 100. Division, not administration steps.
Formula
concentration (mg/mL) = vial mg / diluent mL
volume (mL) = (dose mcg / 1000) / concentration
syringe units = volume mL × units per 1 mL (blank = 100)
Every quantity > 0. This is concentration arithmetic, not a medical dose and not injection instructions.
mcg, concentration, and syringe units
Milligrams in the vial divided by milliliters of diluent. 5 mg in 2 mL is 2.5 mg/mL; 250 mcg is 0.1000 mL and 10.0 units at a scale of 100.
- concentration
- Vial mg / diluent mL. 5 / 2 = 2.5000 mg/mL. Arithmetic, not a clinic dose.
- mcg
- Micrograms of the dose you want, divided by 1000 before concentration. 250 mcg is 0.250 mg, and 0.250 / 2.5 = 0.1000 mL.
- diluent
- Milliliters of solvent in the vial field. 2 mL with 5 mg sets 2.5 mg/mL; the calculator does not convert beer glasses or droppers.
Examples
Example 2
- Vial: 10 mg
- Diluent: 1 mL
- Dose: 500 mcg
- Units/mL: 100
0.0500 mL, 5.0 units, 10.0000 mg/mL
10 mg per 1 mL and a 0.500 mg dose gives 0.0500 mL, which is 5.0 ticks on U-100.
Example 3
- Vial: 2 mg
- Diluent: 2 mL
- Dose: 200 mcg
- Units/mL: 100
0.2000 mL, 20.0 units, 1.0000 mg/mL
Concentration 1 mg/mL and 200 mcg gives 0.2000 mL, because 0.200 / 1 = 0.2.
Example 4
- Vial: 5 mg
- Diluent: 1 mL
- Dose: 100 mcg
- Units/mL: 100
0.0200 mL, 2.0 units, 5.0000 mg/mL
0.100 mg at 5 mg/mL gives 0.0200 mL and 2.0 units on a 100-tick-per-milliliter scale.
Example 5
- Vial: 10 mg
- Diluent: 2 mL
- Dose: 250 mcg
- Units/mL: 50
0.0500 mL, 2.5 units, 5.0000 mg/mL
Volume 0.0500 mL at 50 units per mL gives 2.5 ticks, and concentration stays 5 mg/mL.
Example 6
- Vial: 1 mg
- Diluent: 1 mL
- Dose: 100 mcg
- Units/mL: blank (= 100)
0.1000 mL, 10.0 units, 1.0000 mg/mL
Blank units fill 100, so 0.1000 mL gives 10.0 on the syringe.
Example 7
- Vial: 5 mg
- Diluent: 2.5 mL
- Dose: 500 mcg
- Units/mL: 100
0.2500 mL, 25.0 units, 2.0000 mg/mL
5 / 2.5 = 2 mg/mL, and 0.500 / 2 gives 0.2500 mL and 25.0 units.
Example 8
- Vial: 10 mg
- Diluent: 4 mL
- Dose: 200 mcg
- Units/mL: 40
0.0800 mL, 3.2 units, 2.5000 mg/mL
Concentration 2.5 mg/mL and 0.200 mg gives 0.0800 mL, and 0.0800 × 40 gives 3.2 units.
Frequently asked questions
What do I get at 5 mg, 2 mL, and 250 mcg on a 100 scale?
Concentration 2.5000 mg/mL, volume 0.1000 mL, and 10.0 units. 0.250 mg / 2.5 = 0.1.
Does the calculator pick a dose or say how much to take?
No. We do not judge a substance and we do not plan administration. You type numbers, we divide milligrams by milliliters.
What does a blank units-per-mL field do?
It inserts 100. 1 mg in 1 mL and 100 mcg then gives 0.1000 mL and 10.0 units. Typed 0 is not a useful scale, so the field stays blank or positive.
What is 10 mg, 1 mL, and 500 mcg?
10.0000 mg/mL, 0.0500 mL, and 5.0 units at 100. 0.500 / 10 = 0.05.
How does a 40 scale differ from 100 at 0.0800 mL?
Milliliters stay 0.0800, because they come from concentration and mcg. 0.0800 × 40 = 3.2 units. At 100 it would be 8.0.
What if the vial, diluent, or mcg field is empty?
The math stops. Those three quantities must be greater than zero. The calculator does not guess 5 mg and 2 mL.
What is 5 mg in 2.5 mL and 500 mcg?
2.0000 mg/mL, 0.2500 mL, and 25.0 units at 100. 5 / 2.5 = 2, and 0.500 / 2 = 0.25.
Are syringe units the same as milliliters?
No. A milliliter is volume. Units are ticks on a scale, which is why there is a separate field.
What is 10 mg in 2 mL and 250 mcg on a 50 scale?
5.0000 mg/mL and 0.0500 mL. 0.0500 × 50 = 2.5 units. Concentration does not depend on the scale.
Does US mode turn 0.1000 mL into ounces?
No. A milliliter stays a milliliter, a milligram a milligram. The header does not convert this arithmetic.
Knowledge sources
Concentration and volume are paper arithmetic. This is not a prescribed dose.
Page updated in 2026.