Anesthesia Dose Quick Reference

Calculator

Sex used in weight formulas

Height

cmTotal inches

FeetInches

Weight

kglb

Enter height and weight to calculate.

TBW—Total body weight

IBW—Ideal body weight

PBW—Predicted body weight

LBW—Lean body weight

AdjBW—Adjusted body weight

BMI—Body mass index · kg/m²

Initial dose & ventilation reference

Results appear after valid height and weight are entered.

Reversal & dosing notes

Sugammadex uses actual body weight: 2 mg/kg at reappearance of T2; 4 mg/kg at 1–2 post-tetanic counts with no TOF response; 16 mg/kg for immediate reversal approximately 3 minutes after rocuronium 1.2 mg/kg. These are different indications, not interchangeable doses. Not recommended in severe renal impairment (CrCl <30 mL/min).

Use quantitative neuromuscular monitoring. Rocuronium RSI here uses AdjBW, matching the original tool; protocols may use another scalar. Titrate anesthetics to response and account for age, comorbidities, and concurrent drugs.

6–8 mL/kg PBW is a ventilation reference, not a complete ventilator prescription; ARDS protocols generally start at 6 mL/kg PBW and require pressure-based adjustment.

Drug weight reference

Drug	Weight	Note
Ventilation
Tidal volume	PBW	6–8 mL/kg; ARDS 6
Hypnotics
Propofol induction	LBW	Titrate induction to effect; TBW dosing may cause hypotension
Propofol infusion	TBW / AdjBW	Titrate to clinical response and depth of anesthesia
Etomidate	LBW	Limited data
Ketamine	LBW / IBW	Limited data
Midazolam	Bolus TBW, infusion IBW	Use small increments, particularly with OSA
Dexmedetomidine	LBW / AdjBW	Limited data
Opioids
Fentanyl, sufentanil	LBW
Remifentanil	LBW	TBW → bradycardia, hypotension
Morphine, hydromorphone	IBW / AdjBW	Monitor if OSA
Neuromuscular blockers
Succinylcholine	TBW	1 mg/kg
Rocuronium	IBW / LBW	TBW → prolonged block
Rocuronium RSI	AdjBW / TBW	1.2 mg/kg; IBW = slower onset
Vecuronium	IBW
Cisatracurium, atracurium	IBW / LBW	Use TOF
Reversal
Sugammadex	TBW	2 / 4 / 16 mg/kg according to block depth and indication; see reversal notes above
Neostigmine	Capped	0.03–0.07 mg/kg, max 5 mg
Other
Local anesthetics	IBW / LBW	Respect absolute max
Volatiles	None	ET / MAC
Phenylephrine, norepinephrine	Titrate	To MAP; check pump weight if μg/kg/min
Epinephrine	Fixed	Route and dose depend on indication; follow the relevant resuscitation protocol
Cefazolin	Fixed	2 g; 3 g if ≥ 120 kg
Vancomycin	TBW	15 mg/kg
Heparin (UFH)	TBW	Follow ACT

Weights & formulas

TBW Total body weight: Measured weight in kg. 1 lb = 0.45359237 kg.
IBW Ideal body weight: Male: 50 + 2.3 × (height in inches − 60)
Female: 45.5 + 2.3 × (height in inches − 60)
PBW Predicted body weight: Male: 50 + 0.91 × (height in cm − 152.4)
Female: 45.5 + 0.91 × (height in cm − 152.4)
Used for tidal volume. The rounded inch and centimeter coefficients give slightly different results; IBW and PBW are calculated separately here.
LBW Lean body weight · Janmahasatian: Male: 9270 × TBW ÷ (6680 + 216 × BMI)
Female: 9270 × TBW ÷ (8780 + 244 × BMI)
AdjBW Adjusted body weight: IBW + 0.4 × (TBW − IBW)
BMI Body mass index: TBW ÷ height in meters². 1 inch = 2.54 cm.

TCI models have model-specific weight and BMI limits. Check the selected pump model and its instructions; do not substitute a calculated weight unless that model explicitly requires it.

Use without an internet connection

Open this page in Safari. Tap Share → Add to Home Screen. Keep Open as Web App enabled if shown.
Open the new Anesthesia Dosing icon while online. Wait for Ready for offline use.
Turn on airplane mode and reopen the icon to confirm offline access.

The calculator, reference tables, formulas, and patient records work offline. Source links and the personal homepage need a connection. Updates require a connection; clearing website data or system storage eviction can remove offline files and records.

Sources

Original obesity dosing reference adapted for this site. Source links open online.