Standard Doses (Adult, IBW):
Propofol Induction: 1.5–2.5 mg/kg | Maintenance: 50–150 mcg/kg/min
Fentanyl: 1–2 mcg/kg (induction) | Rocuronium: 0.6–1.2 mg/kg
Pediatric: Use actual weight <40 kg; adjust for obesity.
Anesthesia Dose Calculator 2025: Safe Dosing for Induction & Maintenance
Anesthesia dosing requires precision. Our calculator provides weight-based doses for propofol, fentanyl, rocuronium, and more. Includes pediatric adjustments and MAC values.
Key Principles
- IBW for obese patients: Use in lipophilic drugs (propofol, fentanyl)
- LBW for neuromuscular blockers: Rocuronium, succinylcholine
- Pediatric: Higher mg/kg due to larger ECF
Drug-Specific Dosing
| Drug | Adult Dose | Pediatric | Notes |
|---|---|---|---|
| Propofol | 1.5–2.5 mg/kg | 2.5–3.5 mg/kg | Reduce in elderly |
| Fentanyl | 1–2 mcg/kg | 1–3 mcg/kg | Titrate slowly |
| Rocuronium | 0.6 mg/kg (intubation) | 0.6–1.2 mg/kg | Reversal: Sugammadex |
| Sevoflurane MAC | 1.8–2.0% | 2.5–3.0% | Age-adjusted |
Special Populations
- Elderly: Reduce propofol 20–30%
- Obese: Use IBW for induction, TBW for maintenance
- Liver/Renal failure: Adjust fentanyl, rocuronium
MAC Calculator
MAC decreases ~6% per decade after 40. Sevoflurane MAC: 2.0% (adult), 2.8% (infant).
Epidural Dosing
- Lidocaine 1.5%: 15–20 mL (T10 level)
- Bupivacaine 0.5%: 10–15 mL
- Test dose: 3 mL lidocaine + epinephrine
Reversal Agents
- Sugammadex: 2–4 mg/kg (rocuronium)
- Neostigmine: 0.04–0.07 mg/kg + glycopyrrolate
Limitations
- Not for TIVA or target-controlled infusion
- Does not replace clinical judgment
- Verify allergies, drug interactions
Pro Tips
- Preoxygenate 3–5 min before induction
- Use processed EEG (BIS) for propofol
- Document all doses and times
FAQs
Can I use TBW for propofol in obese? No — use IBW to avoid overdose.
What if patient is <1 year? Use age-specific MAC, higher mg/kg.
How to calculate IBW? Men: 50 + 0.91×(cm−152.4) | Women: 45.5 + 0.91×(cm−152.4)
Conclusion
Our 2025 Anesthesia Dose Calculator ensures safe, accurate dosing. Always confirm with local protocols and anesthesiologist supervision.
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