Free Pediatric & Adult Drug Dose Calculator

Calculating weight-based pediatric doses under time pressure in a busy OPD or emergency is error-prone. PediaRx eliminates mental arithmetic so you can focus on your patient.

• Shows syrup volume in mL as the primary result — the number you actually write on the prescription
• Handles multiple syrup strengths (e.g. PCM 120, 125, and 250 mg/5mL)
• Automatically switches to tablet dosing after the appropriate age threshold
• Shows tablet dose in fractions (½ tab, 1½ tab, etc.)
• IV route: dose, volume to draw, diluent, and infusion time
• Estimates weight from IAP 50th centile chart when actual weight is unavailable
• Fuzzy search — works with typos and common abbreviations
• Adult mode with fixed and weight-based adult dosing
• Pregnancy categories when sex is set to female
• Live formulary synced from db.pediarx.com — always current
• Works fully offline after first load (PWA)

Plus a custom drug calculator for any drug not in the list.

PediaRx uses IAP (Indian Academy of Pediatrics) 50th centile growth chart reference weights for estimating doses when a scale is unavailable — common in rural and semi-urban settings.

All dosing is based on BNFc, IAP Drug Formulary, and WHO guidelines. Drugs banned in India (e.g. Ranitidine) are excluded.

PediaRx was built by Dr. Shounak Pal, MBBS — a practising physician — for his own clinical use. He is the founder, sole developer, and clinical author of the formulary, not an external “reviewer” of a third-party tool. The calculator has also been peer-tested with clinical colleagues.

Primary references: BNFc, IAP Drug Formulary, WHO guidance, and NNF schedules where applicable. Formulary region: India (IN). Always verify doses against your local protocol and product insert.

Related tools: FluidCalc — pediatric IV fluids (Holliday-Segar / 4-2-1, bolus, deficit).