BioDeviceHub

Biomedical Engineering calculators

Calculations tied to the equipment and the measurements around it. Centrifuge speed, k-factor and pelleting time; heart rate and QTc from an ECG; body mass index and surface area; infusion, flow and drip rates; pressure, temperature and general unit conversion; battery run time; and the signal side of instrumentation, from frequency and sampling rate to decibels, signal-to-noise ratio and converter resolution.

The measurement-quality tools cover sensor sensitivity, calibration error, percent error, accuracy and precision. The clinical calculators are educational arithmetic, stated as such on the page, and are not for patient care; each links to the equipment it applies to and to the bench simulators.

RCF to RPM Centrifuge CalculatorConvert between rpm and × g for any rotorOpen calculatorNyquist Sampling Rate CalculatorMinimum sampling rate and alias frequencyOpen calculatorOhm's Law CalculatorVoltage, current, resistance and powerOpen calculatorCentrifuge k-Factor and Pelleting Time Calculatork-factor, pelleting time, and run time between rotorsOpen calculatorECG Heart Rate CalculatorHeart rate from the R-R interval, grid boxes or a counted stripOpen calculatorQTc Calculator (Bazett, Fridericia and more)Heart-rate-corrected QT by four published formulasOpen calculatorBMI CalculatorBody mass index with the WHO adult categoriesOpen calculatorBody Surface Area CalculatorBSA by the Mosteller, Du Bois, Haycock and Gehan-George formulasOpen calculatorIV Flow Rate CalculatormL per hour from a volume and a time, or time and volume from a rateOpen calculatorDrip Rate CalculatorDrops per minute for a gravity infusion setOpen calculatorWeight-Based Infusion Rate CalculatorPump rate from a dose per kg per minute and a concentrationOpen calculatorPressure Unit ConvertermmHg, kPa, cmH₂O, psi, bar, atm and moreOpen calculatorTemperature ConverterCelsius, Fahrenheit, Kelvin and RankineOpen calculatorLaboratory Unit ConverterVolume, mass, length, time, pressure, electrical units and moreOpen calculatorDevice Battery Life CalculatorRun time, battery size, and energy use of a deviceOpen calculatorFrequency and Period CalculatorHertz, period, angular frequency and cycles per minuteOpen calculatorSampling Frequency CalculatorSampling rate, record size and frequency resolutionOpen calculatorSignal-to-Noise Ratio CalculatorSNR in dB from amplitudes, powers or mean and standard deviationOpen calculatorDecibel CalculatorRatios to dB, dB to ratios, and dBm to powerOpen calculatorSensor Sensitivity CalculatorSlope, offset and non-linearity from calibration pointsOpen calculatorCalibration Error CalculatorError at each point, as % of reading and of full scale, against a toleranceOpen calculatorPercent Error CalculatorPercent error of a measured value against an accepted oneOpen calculatorAccuracy and Precision CalculatorBias, standard deviation, %RSD and total error from repeatsOpen calculatorADC Resolution CalculatorLSB size, ideal SNR, bits needed, and effective bitsOpen calculator

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Service documentation, failure modes and parts for the instruments these calculations are used with.

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