Clinical Tools / Live calculator

Veterinary CRI calculator

Convert a continuous-rate infusion plan into drug-per-hour and infusion-rate math. Optional dilution inputs show the final bag concentration needed over the planned duration. This tool is an arithmetic check only; verify the target rate, carrier fluid, and pump setup before clinical use.

Input

Enter the infusion plan

Enter the patient weight, selected dose rate, and stock drug concentration. Add total fluid volume and infusion duration only when you want the diluted bag concentration.

Body weight Weight unit

Dose rate Dose-rate unit

Drug concentration Concentration unit

Total fluid volume optional Infusion duration optional

Result

Infusion result

Enter weight, dose rate, and drug concentration to calculate hourly infusion math.

Awaiting calculation

Confirm the patient weight and selected kg/lb unit.
Enter the intended dose rate and its unit exactly as written.
Use the stock drug concentration printed on the vial or bag.

Formula

Formula audit trail

1. Convert body weight to kg when weight is entered in lb.

2. Normalize the dose rate to mg/kg/hr when the rate is entered as mcg/kg/min.

3. Drug required per hour = body weight x normalized dose rate.

4. mL/hr = mg/hr divided by stock concentration.

5. Final concentration = total drug for duration divided by total fluid volume when optional dilution inputs are supplied.

Rounding is for display only. Small infusion rates keep additional decimal places visible.

Calculation steps will appear here for verification.

Safety checks

Review before use

Arithmetic check only.
Verify the target rate, carrier fluid, and pump settings.
Confirm final dilution, line setup, and monitoring plan before starting the infusion.

Basis

Basis and limits

Calculation basis: weight-based CRI arithmetic for mg/kg/hr and mcg/kg/min with stock-concentration conversion to mg/hr, mL/hr, and mL/min.

This tool provides arithmetic estimates based on commonly used veterinary formulas and reference values. It does not select treatments or replace clinical judgment. Always verify values against current protocols and product labels before use.

Reference ranges and approaches align with standard veterinary resources (e.g., emergency and internal medicine references such as Merck Veterinary Manual and common clinical guidelines).