Use the reconstitution calculator

On the web

• In a chat: select Dose calculator in the message box. It is also in the + menu.
• Calculator in the sidebar opens the same calculator on a full page, which also handles vials that hold more than one compound.
• Recent calculations, under the calculator on that page, lists the calculations in your chats, including the ones ChatPEP worked out in an answer. Select one to open that chat with the calculator on those numbers.
• On the ChatPEP website: Calculators in the top menu lists calculator pages for individual compounds. These pages work without an account.
• In an answer: when ChatPEP works out the math for you, the answer includes the calculator, and you can change its numbers right there.

On iPhone and on Android

Tap Calculator in the sidebar, or Dose calculator in the message box. When an answer includes a calculation, tap Adjust in calculator to open it with those numbers.

• Vial: how much is in the vial, from its label, in mg. For a vial labeled in IU, the amount is in IU, and on the web this field reads Vial potency.
• BAC water: how much water was added, in ml.
• Dose: the amount you want converted into syringe units. Choose mcg, mg, or IU beside it.

On the website's compound pages, the unit is set for that compound. In the iPhone and Android apps, the unit buttons sit above the three fields.

• Concentration: how much of the compound is in each syringe unit.
• The large number: how many units hold the amount you entered, followed by the same volume in ml.
• Doses per vial: how many times that amount fits in the vial, rounded down to a whole number.

The calculator counts on a 100-unit syringe scale, where 100 units equal 1 ml.

Above the fields, choose Water to add instead of Units to draw. The BAC water field becomes Units per dose: enter how many units you want the amount to fill, and the large number becomes the water to add, in ml. The rest of the result is worked out from that water.

It is the same arithmetic run backwards. For a 5 mg vial and 250 mcg filling 10 units, the water is 2 ml. Like every number here, that only shows the math.

Under the result, the calculator draws a syringe filled to the number of units. Choose 1 ml, 0.5 ml, or 0.3 ml to match the barrel you are looking at. All three hold 100 units per ml, so the size only changes the drawing, never the number of units. When the result is more than the chosen syringe holds, the caption under the drawing says so. In the iPhone and Android apps, the app remembers the size you chose.

The calculator does not offer U-40 or U-50 syringes. Those count units differently, so the same amount would read as a different number of units.

The numbers below only show the arithmetic. They are not a suggestion.

1. A 10 mg vial holds 10,000 mcg, since 1 mg is 1,000 mcg.
2. Adding 2 ml of water makes 200 units of liquid, since each ml is 100 units.
3. The concentration is 10,000 mcg divided by 200 units, which is 50 mcg per unit.
4. For an amount of 1,000 mcg, divide by the concentration: 1,000 divided by 50 is 20 units, or 0.2 ml.
5. The vial holds 10,000 mcg, so it contains that amount 10 times.

For a vial labeled in IU, the amount is also in IU, so there is no mg to mcg step.

Changing between mcg, mg, and IU can reset the numbers to their starting values. Check all three fields after you switch.

On the web, the calculator opens with the numbers you last set in that browser. In a chat, it opens in the unit that fits the compound the chat is about, and it only reuses your last numbers when their unit matches. In the iPhone and Android apps, it opens with starting values, or with the numbers from the calculation you opened it from.

Note: The calculator only does arithmetic on what you enter. It does not know what is in the vial, it does not check whether an amount makes sense, and it never tells anyone what to take. ChatPEP is for research only.

The result is only as accurate as the numbers you enter, so check them against the vial label. To ask ChatPEP about a result, see Add a calculation to a message.