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Intranasal Spray Calculator

A concentration and a per-actuation volume give what one spray comes to. The per-actuation volume is your device's own figure and is asked for rather than assumed: metered nasal pumps are sold in a range of delivery volumes, so a single built-in number would mis-state every bottle that did not match it.

Last reviewed: September 21, 2026

A vial strength and a water volume give a concentration; the volume your device delivers per actuation gives what one spray comes to.

Your device's figure, not a general one — metered nasal pumps are sold in a range of delivery volumes. It is printed by the pump manufacturer.

How the arithmetic works

  • Concentration (mcg/mL) = vial strength (mg) × 1000 ÷ water volume (mL)
  • Per actuation (mcg) = concentration (mcg/mL) × volume per actuation (mL)
  • Actuations in the bottle = water volume (mL) ÷ volume per actuation (mL)

The volume one actuation delivers belongs to the device, not the solution, and this page does not state a figure for it — it is a required input, read off the device or its packaging. A spray bottle’s labeled volume is not always its water-fill volume either; where the two differ, the water volume actually added is the number this arithmetic uses.

Worked example

A 10 mg vial reconstituted with 5 mL of water, through a device stated by its own manufacturer to deliver 0.1 mL per actuation — an illustrative figure, not a typical or recommended one:

Concentration10 mg × 1000 ÷ 5 mL = 2000 mcg/mL
Per actuation2000 mcg/mL × 0.1 mL = 200 mcg (0.2 mg)
Actuations in the bottle5 mL ÷ 0.1 mL = 50, before priming losses

Enter the same three numbers into the calculator above and it returns the same figures.

What changes the answer

  • Per-actuation volume. The single most consequential input on this page, and the one most likely to differ from a reader’s assumption — two different pumps on chemically identical solutions can deliver meaningfully different mcg per spray. It is printed by the device manufacturer, not general knowledge to be estimated.
  • Water volume. More water lowers the concentration and the mcg per actuation, and raises the number of actuations the bottle holds; less water does the reverse.
  • Priming losses. The actuation count above is before any volume lost filling the pump mechanism on its first few presses — the device manufacturer states that figure separately, and it is not modeled here.

FAQ

How many mcg per spray is a 10 mg nasal vial?
It depends on the water volume and the device's own per-actuation volume, which this calculator needs as inputs — there is no fixed answer without both. A 10 mg vial in 5 mL of water, through a device delivering 0.1 mL per actuation, comes to 200 mcg per spray (0.2 mg). A different bottle volume or a different device changes the figure.
How much liquid does one nasal spray actuation deliver?
It varies meaningfully from one metered nasal pump to another, and this page does not state a figure for it — the exact volume for any specific device is printed by its manufacturer, on the pump or its packaging. This calculator takes that volume as an input rather than a built-in constant, because a hard-coded figure would silently mis-state every bottle that used a different pump.
How many sprays are in a nasal bottle?
The bottle's water volume divided by the device's per-actuation volume. 5 mL of solution through a device delivering 0.1 mL per actuation holds 50 actuations, before any priming losses — the volume lost filling the pump mechanism before the first usable spray, which the device manufacturer states separately.
intranasal spray calculator peptide
This page's calculator takes a vial strength, the water volume in the bottle, and the volume your specific device delivers per actuation, and returns the concentration, the mcg (and mg) delivered per actuation, and how many actuations the bottle holds.
Why do I need to know my device's actuation volume?
Because it isn't the same across devices, and this calculator doesn't assume one. The per-actuation volume belongs to the pump, not the solution — the same 10 mg vial in the same water volume delivers a different mcg per spray through a device that dispenses 0.07 mL per actuation than through one dispensing 0.1 mL. That figure is printed by the pump's manufacturer.

For a compound’s injectable reconstitution arithmetic instead, see the general peptide dosage calculator.