Nitrous Oxide Dosing Calculator

Calculate N2O/O2 flow rates and gas consumption for pediatric dental sedation based on patient weight, target concentration, and procedure duration.

Patient weight (kg)

Target N2O concentration (%)

Procedure duration (min)

Sedation level

Tab to move between fields

Total gas flow (L/min)

N2O flow rate (L/min)1.8

O2 flow rate (L/min)4.2

Actual O2 percentage (%)70

N2O consumed (L)54

Total O2 needed (L)156

Titration steps to target1

Safety alert0

How to Use This Calculator

Enter the patient's weight in kg and the Target N2O concentration (20–50%) — typical pediatric dental sedation uses 30–40%.
Enter the expected Procedure duration in minutes and set Sedation level (1 = minimal anxiolysis, 2 = moderate sedation).
Review the Total gas flow (L/min), N2O flow rate (L/min), and O2 flow rate (L/min) to set your flowmeter.
Verify the Actual O2 percentage — this must remain ≥ 30%; if the Safety alert flag = 1, increase O2 flow before proceeding.
Note the Titration steps from 20% to your target concentration, N2O consumed (L), and Total O2 needed including the mandatory 5-minute post-procedure oxygen flush.

How the result changes with Patient weight (kg)

Patient weight (kg): Child's weight in kilograms.
Target N2O concentration (%): Desired nitrous oxide percentage (20–50%). Most pediatric cases: 30–40%.
Procedure duration (min): Expected procedure length in minutes.
Sedation level: 1 = Minimal (anxiolysis), 2 = Moderate sedation.

Total gas flow (L/min): Combined N2O + O2 flow rate in liters per minute.
N2O flow rate (L/min): Nitrous oxide delivery rate.
O2 flow rate (L/min): Oxygen delivery rate.
Actual O2 percentage (%): Oxygen percentage in the delivered gas mix (must be >= 30%).
N2O consumed (L): Total nitrous oxide consumed during the procedure.
Total O2 needed (L): Total oxygen needed including 5-minute post-procedure flush.
Titration steps to target: Number of 10% increments from 20% starting concentration to reach target.
Safety alert: 0 = Safe, 1 = Warning — O2 percentage below minimum 30% threshold.

Identify Input Parameters
4 parameters
Patient weight (kg) = 20, Target N2O concentration (%) = 30, Procedure duration (min) = 30, Sedation level = 1 = 4 input(s) provided
Calculate Total gas flow
Total gas flow
6 = 6
Calculate N2O flow rate
N2O flow rate
1.8 = 1.8
Calculate O2 flow rate
O2 flow rate
4.2 = 4.2