# Infusion Rate Calculator (mL/hr) Calculate the infusion pump rate in mL/hr = Total volume / Infusion time. Time may be hours+minutes or minutes; also reports mL/min and the decimal duration. Verify pump units match the order, confirm line patency, and sum channels for restricted patients. Derived from Macklin 2011, NICE CK174 2017, Phillips 2007, and ISMP. Not medical advice. > Canonical page: https://elysiatools.com/en/tools/infusion-rate-ml-hr - **Category:** Health - **Keywords:** infusion rate, mL/hr, pump rate, volumetric pump, syringe pump, mL/min, IV rate, infusion calculation, nursing, maintenance fluid, antibiotic admixture ## Overview The Infusion Rate Calculator determines an infusion pump rate in mL/hr from the total volume and infusion time. Enter time as hours, minutes, or both to also see the equivalent mL/min and decimal duration. Verify the result against the order and pump settings; this tool is not medical advice. ## Inputs - **Volume (mL)** (number): Total volume to infuse (mL). - **Time (hours)** (number): Infusion time, hours component. May be combined with minutes. Either hours or minutes (or both) must be > 0. - **Time (minutes)** (number): Infusion time, minutes component (0–59). Combined with hours if given. - **Decimal Places** (number) ## When to use - Calculate a pump rate for a known volume infused over a specified time. - Convert a short infusion entered in minutes into mL/hr and mL/min. - Check the expected rate for maintenance fluids or an antibiotic mini-bag before verifying it against the prescription. ## How it works - Enter the total infusion volume in mL. - Enter the duration using hours, minutes, or both; the calculator converts the total time to decimal hours. - The rate is calculated as total volume divided by infusion time. - The result reports mL/hr, mL/min, decimal duration, and a calculation category. ## Use cases - Set a volumetric pump rate for a 1,000 mL maintenance infusion over 8 hours. - Calculate the rate for a 100 mL antibiotic piggyback administered over 30 minutes. - Review mL/hr and mL/min values when checking infusion calculations or syringe-pump settings. ## Frequently asked questions ### What formula does the calculator use? It uses mL/hr = total volume in mL ÷ infusion time in hours. ### Can I enter only minutes? Yes. Enter the duration in the minutes field, such as 30 minutes for a 100 mL infusion. ### What does the calculator output? It reports the pump rate in mL/hr, the equivalent mL/min, the duration in decimal hours, and the calculation method. ### How many decimal places can I choose? You can set the decimal places from 0 to 8. The default is 1. ### Is this calculator medical advice? No. Verify the result, pump units, line patency, and prescription using applicable clinical procedures. ## Related tools - [Serum Anion Gap (AG) Calculator](https://elysiatools.com/en/tools/anion-gap-calculator): Calculate the serum Anion Gap (AG) to classify metabolic acidosis. Standard formula AG = Na⁺ − Cl⁻ − HCO₃⁻ (mmol/L), or AG = Na⁺ + K⁺ − Cl⁻ − HCO₃⁻ with optional potassium. 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