Skip to main content
Calcimator

Avian Medication Dosing Calculator

Calculate drug doses for birds based on body weight, medication type, and drug concentration.

About this calculator

This calculator converts a documented mg/kg dose rate for seven common avian medication entries into a per-administration and per-day dose and volume, based on the bird's body weight in grams and the concentration of the drug solution or suspension you have on hand. Dosing figures here are general reference points drawn from published avian veterinary guidance (including the Merck/MSD Veterinary Manual's pet-bird dosing tables and peer-reviewed avian pharmacology reviews) rather than a single universal standard -- real avian dosing varies by species, individual bird health, and the specific formulation, so these numbers are a starting point for discussion with an avian veterinarian, not a replacement for a prescription. Bird weight is the dominant factor in every dose calculation here, since dose scales linearly with body weight and birds span an enormous weight range in this calculator (5 g to 50,000 g) -- a small error in weighing a budgerigar (roughly 35 g) has a much larger proportional impact than the same absolute error would for a macaw (roughly 1,000 g), which is why using an accurate gram scale matters more in avian medicine than in most other veterinary dosing contexts.

Each medication's dosing-frequency options are restricted to the interval its mg/kg rate was actually documented at -- Meloxicam and both Itraconazole entries, for example, only offer once-daily dosing here, because pairing any of their per-dose rates with a twice-daily schedule would roughly double the intended daily total. Itraconazole gets particular caution and its own dedicated species-specific entry: African grey parrots are documented in avian veterinary literature (the Merck/MSD Veterinary Manual specifically notes African greys "should be dosed at 5 mg/kg/day") to tolerate the standard 10 mg/kg once-daily rate poorly, with reported toxicity including anorexia and weakness, so this calculator offers a separate "Itraconazole (African grey/sensitive)" option computed at the reduced 5 mg/kg rate rather than requiring you to manually halve the standard result -- always confirm species-specific dosing with an avian veterinarian regardless of which entry you select.

Inputs

Results

Dose per administration (mg)

6

Volume per dose (mL)

0.6

Total daily dose (mg)12
Total daily volume (mL)1.2
Dose rate (mg/kg)15
Est. BMR (kcal/day)40.21

Figures current as of 2026. Source: Merck/MSD Veterinary Manual, "Mycotic Diseases of Pet Birds" — Aspergillosis treatment section

How to Use This Calculator
  1. Enter the bird's weight in grams, weighed on a gram scale rather than estimated — avian dosing is weight-sensitive and small birds tolerate very little margin for error.
  2. Select the Medication from the list; each option shows its documented per-dose mg/kg rate. Itraconazole has two separate entries — use "African grey/sensitive" for that species, not the standard rate halved by hand.
  3. Enter the Drug concentration (mg/mL) from the product label of the specific formulation you have on hand.
  4. Select Doses per day — only intervals verified for the selected medication are offered, so this list changes depending on which medication you picked.
  5. Review Dose per administration and Volume per dose for what to give at each administration, and Total daily dose / Total daily volume for the full day's total.
  6. Always confirm the dose, concentration, and frequency with the prescribing avian veterinarian before administering — this calculator provides general reference figures only, and any species-specific dosing not covered by a dedicated entry (such as the African grey itraconazole option) still needs veterinary confirmation.

How the result changes with Bird weight (grams)

Bird weight (grams)Dose per administration (mg)Volume per dose (mL)
20030.3
3004.50.45
60090.9
1,000151.5

What each input means

Bird weight (grams)
Body weight in grams. Budgerigar ~35g, Cockatiel ~90g, Amazon parrot ~400g, Macaw ~1000g.
Medication
0 = Enrofloxacin (15 mg/kg), 1 = Meloxicam (0.5 mg/kg), 2 = Doxycycline (25 mg/kg), 3 = Metronidazole (25 mg/kg), 4 = Itraconazole standard (10 mg/kg, once daily), 5 = Butorphanol (2 mg/kg), 6 = Itraconazole African grey/sensitive (5 mg/kg, once daily). African grey parrots are not well tolerated at the standard itraconazole rate — select the dedicated 'African grey/sensitive' option for that species so the computed dose reflects the reduced 5 mg/kg/day rate directly, rather than manually halving the standard result.
Drug concentration (mg/mL)
Concentration of the drug solution or suspension in mg per mL.
Doses per day
Dosing frequency: SID = 1, BID = 2, TID = 3, QID = 4. Only intervals verified for the selected medication are offered — e.g. Itraconazole only offers once daily (SID), since its per-dose rate above was not verified at a twice-daily interval.

What each result means

Dose per administration (mg)
Amount of drug in milligrams per single dose.
Volume per dose (mL)
Volume of drug solution to administer per dose.
Total daily dose (mg)
Total milligrams administered per day across all doses.
Total daily volume (mL)
Total volume of drug solution per day.
Dose rate (mg/kg)
Standard dose rate for the selected medication.
Est. BMR (kcal/day)
Estimated basal metabolic rate using allometric scaling (non-passerine).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Bird weight (grams) = 400, Medication = 0, Drug concentration (mg/mL) = 10, Doses per day = 2 = 4 input(s) provided
  2. Calculate Dose per administration
    Dose per administration = selected.mgPerKg * weightKg
    6 = 6
  3. Calculate Volume per dose
    Volume per dose = dosePerAdminMg / concentrationMgPerMl
    0.6 = 0.6
  4. Calculate Total daily dose
    Total daily dose = dosePerAdminMg * frequencyPerDay
    12 = 12
  5. Calculate Total daily volume
    Total daily volume = volumePerDoseMl * frequencyPerDay
    1.2 = 1.2

Figures and sources

Engine last updated . Checked against 4 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Why does this calculator restrict which dosing frequency I can select for each medication?

Each medication's mg/kg figure was documented in veterinary literature at a specific dosing interval -- Meloxicam and both Itraconazole entries are dosed once daily (SID) at the rates used here, while Enrofloxacin, Doxycycline, and Metronidazole are typically dosed twice daily (BID). Some general avian sources describe Meloxicam and Itraconazole as tolerating once-to-twice-daily dosing depending on the specific reference and formulation, but this calculator deliberately restricts both to the more conservative once-daily interval its rate was verified at, since allowing a once-daily rate to be paired with a twice-daily schedule could silently double the computed daily total -- a real overdose risk rather than just an inconvenience.

Why does Itraconazole need extra caution, especially for African grey parrots?

Itraconazole is generally well tolerated by most psittacine species at the standard 10 mg/kg once-daily rate, but African grey parrots are specifically documented in the Merck/MSD Veterinary Manual to be unusually sensitive to it, with reported toxicity signs including anorexia, regurgitation, and weakness at the standard dose -- that source specifically recommends African greys be dosed at 5 mg/kg/day instead. Because a generic weight-based calculation can't know your bird's species on its own, this calculator lists "Itraconazole (African grey/sensitive)" as its own selectable entry at the reduced 5 mg/kg rate, so choosing it directly computes the safer dose rather than requiring you to manually halve the standard result -- always confirm the correct entry and dose with an avian veterinarian before treating an African grey.

Why does bird weight matter so much more here than in dosing for larger animals?

Dose scales directly and linearly with body weight in this calculator, and birds span an unusually wide weight range -- from a budgerigar around 35 grams to a macaw around 1,000 grams or larger species beyond that -- so a small absolute weighing error represents a much larger proportional dosing error in a small bird than the same error would in a larger one. Because avian patients generally have less physiological buffer for dosing mistakes than larger mammals, always weigh the bird on an accurate gram scale immediately before calculating a dose rather than using a remembered or estimated weight.

Does this calculator replace a veterinary prescription?

No -- this calculator provides general reference dosing figures drawn from published avian veterinary literature, not an individualized prescription. Actual dosing should always be confirmed by an avian veterinarian who can account for the bird's specific species, health status, concurrent medications, and the exact concentration of the formulation being used, since generic reference tables like this one cannot capture species-specific sensitivities such as the itraconazole caution in African grey parrots.

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

More in Family, Parenting & Pets.