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Heparin Units Per Hour Calculator

Work out heparin units per hour instantly with clear inputs, formula shown and shareable results.

About Heparin Units Per Hour Calculator

Converts a heparin bag concentration and pump rate into units per hour, then indexes it to body weight for comparison with the protocol rate.

Formula

Heparin delivery

Concentration = bag units / bag volume; units per hour = concentration x pump rate; units/kg/h = units per hour / weight

Worked example

With the default values below, Heparin Units Per Hour Calculator returns Heparin delivered of 1,200.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Units in the bagaccepts 100–100,000 units
25,000 units
Bag volumeaccepts 10–1,000 mL
250 mL
Pump rateaccepts 0.1–100 mL/h
12 mL/h
Body weightaccepts 1–250 kg
80 kg

Results

Heparin delivered
1,200.0 units/h
Heparin per kilogram
15.000 units/kg/h
Bag concentration
100.00 units/mL
Heparin over 24 hours
28,800 units

Step by step

  1. 1Values used
  2. 2Heparin delivery
  3. 3Heparin delivered= 1,200.0 units/h
  4. 4Heparin per kilogram= 15.000 units/kg/h
  5. 5Bag concentration= 100.00 units/mL
  6. 6Heparin over 24 hours= 28,800 units

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What starting rate is typical?

About 18 units/kg/h after an 80 units/kg bolus for venous thromboembolism.

How is it monitored?

APTT ratio or anti-Xa six hours after starting and after every rate change.

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