Cephalexin for Dogs Dosage Calculator
Convert a veterinarian-prescribed dose.
Weight examples only — no automatic medicine or dose recommendation.
Prescription & Medicine Inputs
Dose Conversion Summary
Example calculation4.40 mL of 50 mg/mL suspension
Prescription Reference Check
AAHA skin infection reference: 22–30 mg/kg, q12h
Prescription Conversion
× 22 mg/kg
= 220 mg
÷ 50 mg/mL
= 4.40 mL
st stcalculator.online
Illustrative medicine image; read your dispensed label. Not a calibrated measuring device.Tablet/capsule equivalents are arithmetic only. Do not round, split or open a product without veterinary instructions.
This tool converts a prescribed dose; it does not select treatment. Confirm formulation, interval and dosing with your veterinarian.
Clinical Reference & Administration Checks
- 1Confirm the prescribed rate and interval
- 2Verify label strength and measure the liquid
- 3Follow your veterinarian’s course and recheck plan
Treatment varies by infection and patient; no universal regimen.
Formula & Worked Example
Dose (mg) = weight (kg) × prescribed rate (mg/kg)
Liquid (mL) = dose (mg) ÷ concentration (mg/mL)
220 ÷ 50 = 4.40 mL
Frequently Asked Questions
Does this tool prescribe a dose?
No. Enter the rate, interval and formulation prescribed for this particular dog. The initial 10 kg, 22 mg/kg and 12-hour values are a worked example, not a recommended treatment.
How do I read mg per 5 mL?
Divide the milligrams on the medicine label by the stated milliliters. For example, 125 mg per 5 mL equals 25 mg/mL. Check the actual dispensed formulation; different strengths are not interchangeable by volume.
Can I split a tablet or capsule?
Tablet or capsule equivalents are arithmetic only. Do not round to a tablet fraction, open a capsule, or split a product unless the prescribing veterinarian or dispensing pharmacist confirms a suitable preparation and the exact instructions.
What if my prescription differs?
Use the actual prescription and contact your veterinarian if its rate, interval or formulation is unclear. Published references differ by infection and patient. A numerical comparison cannot establish safety or diagnose an overdose.
More calculation questions
What does this calculator calculate?
Milligrams per administration, milliliters or unit equivalents per administration, and the arithmetic total over 24 hours from the entered interval. It does not select an antibiotic or treatment duration.
Which values should I enter?
Enter a positive current weight, a prescribed positive mg/kg per-dose rate, the prescribed interval, and the medicine label strength. Do not enter a daily mg/kg total in the per-dose rate field.
What formula is used?
Dose mg = weight kg × prescribed mg/kg per dose. Liquid concentration mg/mL = label mg ÷ label mL. Liquid mL = dose mg ÷ concentration. Arithmetic daily mg = dose mg × 24 ÷ interval hours.
Why might another calculator show a different answer?
Check pounds versus kilograms, per-dose versus per-day rates, label concentration, interval and rounding. This tool does not determine whether a prescription is clinically appropriate.
Do results update immediately?
Yes. Weight, units, prescribed rate, interval and formulation update the conversion immediately. Invalid or incomplete fields clear the results and disable copying.
Is the reference band a universal safety limit?
No. The bar compares the entered rate with AAHA’s 2023 canine skin-infection table (22–30 mg/kg every 12 hours). The 2025 ISCAID pyoderma guideline lists 22–25 mg/kg every 12 hours in its own context. Neither is a personalized prescription or universal toxicity threshold.
How should a suspension be measured?
Follow the preparation and measuring-device instructions for the dispensed medicine and prescription. Read its actual strength, including mg per mL versus mg per 5 mL. This photo is not a calibrated syringe.
Is this useful for budgeting or planning?
It can summarize the arithmetic daily amount of the prescribed medicine. It does not determine course length, a purchase quantity, clinical efficacy or safe administration for a particular patient.
Sources & References
AAHACanine skin infection antimicrobial guidance
Plumb’s Veterinary Drug HandbookVeterinary drug reference · subscription accessReference information is not institutional endorsement.
Convert a veterinarian-prescribed canine cephalexin rate and label strength to mg, liquid mL or arithmetic tablet/capsule equivalents.