Clinical Tools / Live calculator

Veterinary fluid calculator

Estimate maintenance, dehydration deficit, ongoing losses, and an hourly fluid rate for dogs and cats using transparent arithmetic. This tool is a planning check only. Verify the final fluid plan against the current patient assessment and treatment goals.

Input

Enter the fluid plan

Use the editable maintenance preset or enter your own rate, then add dehydration, ongoing losses, and the intended replacement period.

Species Weight unit

Body weight Dehydration percentage

Ongoing losses per day Replacement period

Maintenance requirement Default preset

Maintenance unit Replacement-period unit

Result

Fluid result

Enter weight, dehydration, and replacement inputs to calculate a fluid plan and hourly rate.

Awaiting calculation

Confirm species and current body weight.
Enter the dehydration percentage you intend to replace.
Adjust the maintenance preset if your plan uses a different target.

Formula

Formula audit trail

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

2. Maintenance per day = body weight x maintenance rate.

3. Fluid deficit = body weight x dehydration percentage x 10.

4. Ongoing losses over the selected period = daily losses x hours / 24.

5. Total over the selected period = maintenance over period + deficit + losses over period.

6. mL/hr = total volume over the selected period divided by replacement hours.

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

Calculation steps will appear here for verification.

Safety checks

Review before use

Arithmetic check only.
Confirm the dehydration estimate, maintenance target, and ongoing losses.
Adjust the final fluid plan to current perfusion, monitoring, and reassessment findings.

Basis

Basis and limits

Calculation basis: maintenance per day = body weight x entered maintenance rate. Fluid deficit = body weight x dehydration percentage x 10. Ongoing losses are added separately as a daily volume.

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).