Corid Dosage Calculator Chickens
A Corid dosage calculator for chickens turns your water volume and the severity of the outbreak into a dose: 1 gallon at the standard 0.012% level needs about 4.7 mL of 9.6% liquid Corid — roughly 1 teaspoon. Enter your gallons below and pick the treatment level.
Corid Dosage Calculator Chickens
Planning estimate. Figures vary by breed, strain, climate and management — see the sources cited on this page.
Key facts
- Standard treatment (0.012%): about 4.7 mL per gallon of 9.6% liquid Corid — roughly 1 teaspoon per gallon, or 8 fl oz per 50 gallons — for 3–5 days.
- Severe outbreak (0.024%): about 9.5 mL per gallon — roughly 2 teaspoons per gallon — for 3–5 days, then drop to the follow-up level.
- Follow-up (0.006%): about 2.4 mL per gallon — roughly half a teaspoon per gallon — for 1–2 weeks after treatment.
- Use the 9.6% liquid figures only. Corid 20% powder is a different strength with different amounts — do not mix the liquid and powder figures.
- Make it the only water source. Birds must drink only the treated water during treatment, or they will not get the full dose.
How the Corid dosage calculator works
Enter the gallons of water in your drinker and pick the treatment level, and the calculator multiplies gallons by the label dose for 9.6% liquid Corid: 4.7 mL per gallon at the standard 0.012% level, 9.5 mL per gallon at the severe 0.024% level, and 2.4 mL per gallon at the 0.006% follow-up level. It also shows the amount in teaspoons, because most keepers measure with a kitchen spoon.
Mix a fresh batch every day. Amprolium in drinking water loses strength over time and birds drink less of stale water, so a new batch each morning keeps the dose accurate. Measure with a syringe or a measuring spoon, not by eye — the difference between 1 teaspoon and 2 teaspoons per gallon is the difference between the standard and severe doses.
How long do I treat chickens with Corid?
Treat at the standard or severe level for 3–5 days, then follow with 1–2 weeks at the 0.006% follow-up level. Do not stop early because the birds look better — coccidia are still present in the gut, and stopping early lets the outbreak come back.
During treatment, the treated water must be the only water the birds can reach. Take away puddles, ponds and second drinkers, and keep the drinker clean so the birds actually drink. If a bird is too sick to drink, it is not getting the medicine — that bird needs a veterinarian, not a stronger dose in the water.
Why do Corid doses online disagree?
Blog posts and forums quote very different Corid doses — some say half a millilitre per pound of body weight a day, others say 2–3 teaspoons per gallon — and most of them do not say which product strength they mean. This calculator uses only the published poultry label figures for the 9.6% liquid solution, which is why its numbers may look lower than a forum post that was describing the 20% powder, or a dose worked out per bird instead of per gallon.
Never combine figures from different sources, and never raise the dose because a bird looks worse — a higher dose does not work faster and can cause harm. If the label figures do not match what you bought, check the strength printed on your bottle and ask a veterinarian before you mix anything. Read our coccidiosis in chickens guide for the symptoms that mean treatment is needed and the hygiene steps that stop it coming back.
What this calculator does not do
This calculator converts a water volume into a Corid dose from the published label; it does not diagnose coccidiosis, choose between treatments, or set the egg withdrawal period — those are decisions for a veterinarian, not a calculator. It only works for the 9.6% liquid solution, and it does not cover the 20% powder, other brands, or other medicines.
This calculator gives a planning estimate based on the published poultry label dose. It is not veterinary advice. Consult a veterinarian before treating your birds, especially for laying hens, chicks, or birds you plan to eat. Always weigh the risk, keep a record of each treatment, and ask your veterinarian about egg withdrawal before eating eggs from treated hens.
Frequently asked questions
How much Corid per gallon of water for chickens?
At the standard 0.012% level, about 4.7 mL of 9.6% liquid Corid per gallon — roughly 1 teaspoon per gallon, or 8 fl oz per 50 gallons. For a severe outbreak use about 9.5 mL per gallon (2 teaspoons), and for follow-up use about 2.4 mL per gallon (half a teaspoon).
How long do I give Corid to chickens?
Treat for 3–5 days at the standard or severe level, then follow with 1–2 weeks at the 0.006% follow-up level. Do not stop early because the birds look better — stopping early lets the outbreak come back.
Can I use Corid 20% powder at the same dose as the liquid?
No. Corid 20% powder is a different strength from the 9.6% liquid solution, so its amounts are different. This calculator covers the 9.6% liquid only — do not mix the liquid and powder figures, and check the strength printed on your product.
Do chickens need a vet to get Corid?
Corid is sold over the counter in many places, but this calculator is not veterinary advice. Consult a veterinarian before treating your birds, especially for laying hens, chicks, or birds you plan to eat, and ask about egg withdrawal.
Should sick chickens drink anything else while on Corid?
No. The treated water must be the only water the birds can reach during treatment, or they will not get the full dose. Remove second drinkers and keep birds away from puddles and ponds until treatment is finished.
The Coccidiosis in Chickens: Symptoms & Treatment guide covers this topic in more detail. The Chicken First Aid Kit: What to Keep and How to Use It guide covers this topic in more detail. Two related calculators worth checking next are the Chicken Worming Dosage Calculator and Chicken Water Calculator.