IV Infusion Flow Rate Calculator (mL/hour)
Calculates infusion pump rate in mL/hr from total infusion volume (mL) and duration (hours or minutes).
⚠️ Educational Calculation & Clinical Safety Safeguard: Monitor fluid balance and cardiopulmonary status in heart failure, renal impairment, and paediatric patients. Educational calculations do not replace clinician assessment, patient-specific laboratory monitoring, or institutional prescribing protocols.
Interactive Calculator
Allowed physiological/compounding range: 1 to 10000 mL
Allowed physiological/compounding range: 0.08 to 168 hours
Calculated Output (mL/hr)
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Step-by-Step Mathematical Derivation & Explanation:
Validated Formula & Conversion Rules
Infusion Rate (mL/hr) = Total Volume (mL) / Infusion Time (hours)Worked Clinical Example
1000 mL Normal Saline over 8 hours: Rate = 1000 / 8 = 125.0 mL/hr.
Rounding Rules, Clinical Interpretation, Assumptions & Known Limitations
- 1. Purpose: Calculates infusion pump rate in mL/hr from total infusion volume (mL) and duration (hours or minutes).
- 2. Required Inputs & Validated Units: Total Infusion Volume (mL, range 1–10000), Infusion Duration (hours, range 0.08–168)
- 3. Output Unit:
mL/hr - 4. Result Interpretation Notes: Converts total infusion volume (mL) and duration (hours) into volumetric infusion pump rate (mL/hr).
- 5. Rounding Guidance: Round standard volumetric infusion pump settings to nearest whole mL/hr (or 0.1 mL/hr for syringe pumps).
- 6. Mathematical & Clinical Assumptions: Assumes constant-rate zero-order intravenous infusion.
- 7. Known Limitations & Contraindications to Formula Use: Verify central vs peripheral line osmolarity limits and vesicant safety before starting infusion.
- 8. Supporting Compendial & Clinical References: Indian Pharmacopoeia (IP 2022), National Formulary of India (NFI), British National Formulary (BNF), and NCBI Bookshelf Clinical Pharmacology Compendia.