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Medication Dose/Rate Calculator (mg/kg/hr etc.)

· Last updated：2026-08-09

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Convert bidirectionally between a prescribed clinical dose and an infusion-pump rate (mL/hr). Supports weight-based (mcg/kg/min, mg/kg/hr, units/kg/hr) and flat (units/hr) dosing. Two directions: Dose → Rate and Rate → Dose. ALL high-alert infusions require independent double-checking (ISMP). Derived from Macklin 2011, ISMP, Royal Marsden 9th ed. 2015, and MDCalc. Not medical advice.

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Tool usage guide

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Key facts

Category
Health
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Medication Dose/Rate Calculator converts between a prescribed medication dose and an infusion-pump rate in mL/hr. It supports weight-based units such as mcg/kg/min, mg/kg/hr, and units/kg/hr, plus flat dosing in units/hr. This tool is not medical advice, and high-alert infusions require an independent double-check.

When to use

  • Calculate the pump rate needed for a prescribed weight-based or flat medication dose.
  • Verify the delivered dose from an infusion pump rate and bag concentration.
  • Check infusion calculations for medications such as dopamine or heparin before clinical review.

How it works

  1. 1Choose Dose → Rate to calculate mL/hr from a prescribed dose, or Rate → Dose to verify a running infusion.
  2. 2Select the dose unit and concentration unit, then enter the total drug amount and bag volume.
  3. 3Enter patient weight for mcg/kg/min, mg/kg/hr, or units/kg/hr calculations; weight is not used for units/hr.
  4. 4Enter the prescribed dose or pump rate and choose the number of decimal places for the result.

Use cases

  • Set an infusion pump rate for weight-based vasoactive medication dosing.
  • Verify a flat-rate heparin or other units/hr infusion from its current pump rate.
  • Review concentration, dose, weight, and rate calculations during nursing or critical-care workflows.

Examples

1. Calculate a dopamine pump rate

Critical-care nurse

Background

A dopamine bag contains 400 mg in 250 mL. The prescribed dose is 5 mcg/kg/min for a 70 kg patient.

Problem

Convert the prescribed weight-based dose into a pump rate in mL/hr.

How to use

Select Dose → Rate, choose mcg/kg/min and mg/mL, then enter 400 for drug amount, 250 mL for volume, 70 kg for weight, and 5 for dose.

Decimal places: 2

Outcome

The calculator reports a rate of 13.13 mL/hr.

2. Verify a heparin infusion dose

Nurse verifying a running infusion

Background

A heparin bag contains 25,000 units in 250 mL, and the infusion pump is running at 15 mL/hr.

Problem

Confirm the delivered flat dose in units/hr without using patient weight.

How to use

Select Rate → Dose, choose units/hr and units/mL, then enter 25,000 for drug amount, 250 mL for volume, and 15 mL/hr for the pump rate.

FAQ

What can this calculator convert?

It converts between a medication dose and an infusion-pump rate in mL/hr.

Which dose units are supported?

The calculator supports mcg/kg/min, mg/kg/hr, units/kg/hr, and units/hr.

When is patient weight required?

Weight is required for weight-based units and is ignored for flat dosing in units/hr.

What concentration units can I use?

You can enter concentrations in mg/mL, mcg/mL, or units/mL.

Is this calculator medical advice?

No. Confirm the result against the prescription, medication label, and local protocol. High-alert infusions require an independent double-check.

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Decimal places: 2

Outcome

The calculator reports a delivered dose of 1,500 units/hr.