Electronics · Free Calculator
Non Inverting Op Amp Amplifier Calculator
Find the gain and output voltage of a non inverting op amp stage, or choose Rf for a target gain.
Gain = 1 + Rf/RgOutput voltageHigh input impedanceResistor design
V
V
Voltage gain5.7
Gain in dB15.12 dB
Output voltage2.85 V
How this result was calculated
- Av = 1 + Rf ÷ Rg = 1 + 47 kΩ ÷ 10 kΩ = 5.7
- Vout = 2.85 V
Advertisement
Non Inverting Amplifier Formula
Av = 1 + Rf ÷ Rg
Vout = (1 + Rf ÷ Rg) × Vin
Vout = (1 + Rf ÷ Rg) × Vin
Rg goes from the inverting input to ground, Rf from the output to the inverting input. With Rf = 0 and Rg open the stage becomes a unity gain voltage follower.
Worked example
Rf = 47 kΩ and Rg = 10 kΩ give a gain of 5.7. A 0.5 V input produces 2.85 V.
Key insight: the input goes straight to the op amp pin, so input impedance is very high, ideal for thermocouple, pH and other high impedance sensors.
Advertisement
Frequently Asked Questions
What is the gain of a non inverting amplifier?
1 + Rf/Rg. The output is in phase with the input.
What is the minimum gain?
1, as a voltage follower with Rf shorted and Rg removed.
How do I get a gain of 10?
Use Rf = 9 × Rg, for example 90.9 kΩ and 10 kΩ (E96 values).
You May Also Like
Learn more on the blog
Voltage follower (unity gain buffer) explained
A practical, field focused guide on instrumentationblog.in that explains the theory behind this calculator and how engineers apply it on real plants.
Read Full ArticleMore Electronics Calculators
SMD Resistor Code Calculator3 digit (472), 4 digit (1002)Capacitor Code Calculator3 digit code, Tolerance letterStandard Resistor Values Calculator (E Series)E6 and E12, E24 (5 %)Inductors in Series and Parallel CalculatorSeries, ParallelAir Core Coil Inductance CalculatorWheeler formula, Single layer coilResistor Power Rating CalculatorP = V²/R, P = I²RCurrent Divider CalculatorTwo or three branches, Branch currentWheatstone Bridge CalculatorBalance condition, Output voltageRC and RL Filter Cutoff Frequency CalculatorLow pass, High passRLC Circuit Impedance CalculatorSeries RLC, Parallel RLCLED Series and Parallel Array CalculatorLEDs per string, String resistorTransistor Base Resistor CalculatorBJT switch, SaturationInverting Op Amp Amplifier CalculatorGain = −Rf/Rin, Output voltageOp Amp Differential Amplifier CalculatorVout = (R2/R1)(V2 − V1), Four resistorsOp Amp Summing Amplifier CalculatorOp amp adder, Weighted sumInstrumentation Amplifier Gain Resistor CalculatorAD620, AD8221, INA128, INA333Op Amp Gain Bandwidth and Slew Rate CalculatorGBW ÷ gain, Slew rate555 Timer Astable CalculatorFrequency, Duty cycle555 Timer Monostable Calculatort = 1.1 RC, One shotCrystal Load Capacitor CalculatorC1 = C2, Load capacitanceFrequency to Period CalculatorHz to seconds, Period to HzPWM Duty Cycle CalculatorDuty cycle %, Average voltageLM317 Voltage Regulator CalculatorVout = 1.25(1 + R2/R1), R2 for targetZener Diode Series Resistor CalculatorSeries resistor, Zener powerLinear Regulator Power Dissipation CalculatorPower dissipation, Junction temperatureHeat Sink Thermal Resistance CalculatorθSA in °C/W, Junction temperatureBuck Converter CalculatorDuty cycle, Inductor valueBoost Converter CalculatorDuty cycle, Inductor valueRectifier Filter Capacitor CalculatorSmoothing capacitor, Ripple voltagePCB Trace Width Calculator (IPC 2221)IPC 2221, External and internalPCB Trace Resistance CalculatorCopper resistance, Voltage dropBinary, Decimal, Hex and Octal ConverterBinary, HexadecimalBattery Life Calculator for Electronic DevicesmAh capacity, Sleep currentdBm to Watts CalculatordBm to mW, Watts to dBmResistor Color Code Calculator4 band, 5 bandLED Resistor CalculatorSingle LEDVoltage Divider CalculatorOutput and resistor valuesResistors in Series and ParallelTotal resistanceOhm's Law CalculatorV, I, R and PRC Time Constant CalculatorCharge and dischargeReactance CalculatorXL and XCLC Resonant Frequency CalculatorTank circuitsCapacitors in Series and ParallelTotal capacitanceCapacitor Energy CalculatorJoules and chargeDecibel CalculatorPower and voltage ratiosADC Resolution CalculatorBits and LSB size
More Calculator Categories
Temperature Measurement15 live toolsInstrumentation Signal4 live toolsPLC Digital Signal3 live toolsFlow Measurement19 live toolsLevel Measurement12 live toolsPressure Measurement13 live toolsControl Valve12 live toolsCalibration10 live toolsSafety and SIL7 live toolsAnalytical8 live toolsElectrical37 live toolsUnit Converters76 converters, 700+ units