Mean Arterial Pressure Calculator

Mean Arterial Pressure Formula

Worked Example

A blood pressure of 120/80 mmHg:

1. MAP ≈ DBP + (SBP − DBP) ÷ 3
2. MAP = 80 + 40 ÷ 3 = 93.33333333 mmHg

Alternative estimate DBP + 0.412 PP: 96.48 mmHg · MAP in kPa: 12.44342283 kPa

GATE tip

Total peripheral resistance follows from MAP and CO like Ohm’s law: TPR = (MAP − CVP)/CO. With MAP 93 mmHg, CVP 3 mmHg and CO 5 L/min, TPR = 18 mmHg·min/L.

More Bioinstrumentation and Physiology Calculators

• Cardiac Output Calculator

  CO = SV × HR, CO = VO₂ / (CaO₂ − CvO₂)

  cardiac index CI = CO / BSA; BSA (Mosteller) = √(height cm × weight kg / 3600)

  Example: A stroke volume of 70 mL at 72 beats per minute (170 cm, 70 kg): Cardiac output CO = 5.04 L/min.

  Open the cardiac output calculator →

• ECG Heart Rate Calculator

  HR = 60 / RR (s) = 1500 / small squares = 300 / large squares

  QTc (Bazett) = QT/√RR, (Fridericia) = QT/∛RR, RR in seconds

  Example: An R–R interval of 800 ms with a QT of 400 ms: Heart rate = 75 bpm.

  Open the ecg heart rate calculator →

• Poiseuille Flow Calculator

  Q = π r⁴ ΔP / (8 μ L)

  resistance R = 8μL/(πr⁴); valid for steady laminar flow of a Newtonian fluid

  Example: Blood (3.5 mPa·s) through a 2 mm radius, 10 cm vessel with 100 Pa pressure difference: Flow rate Q = 1.7952 mL/s.

  Open the poiseuille flow calculator →

• Nernst Equation Calculator

  E = (RT/zF) ln([C]ₒᵤₜ/[C]ᵢₙ)

  R = 8.314 J/(mol·K), F = 96,485 C/mol, z the ion’s valence; 61.5 mV per decade at 37 °C for z = 1

  Example: Potassium with 5 mM outside and 140 mM inside the cell at 37 °C: Equilibrium potential E = -89.0587 mV.

  Open the nernst equation calculator →

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.