A growing library of free GC calculators built for chromatographers, instrument engineers, and lab users. These free tools help you work faster, cut manual steps, and improve accuracy across your daily GC workflow.
Detection Limit (LOD) Calculators
Calculators to compute LOD and LOQ using different analytical approaches.
By S/N Ratio & Peak Height
Calculate LOD from noise level, concentration and peak height of a known standard
By S/N Ratio & Peak Area – Peak Width
Calculate LOD from noise level, peak area and peak width of a known standard
By Standard Deviation of Blanks
Calculate LOD using 3 standard deviations from a series of blank runs and calibration curve
By Standard Deviation of a Standard
Calculate LOD using 3 standard deviations from a series of known standard runs
By Residual Standard Deviation
Calculate LOD using residual standard deviation and slope of a calibration curve
FID Relative Response Factor (RRF) Calculators
Calculators to compute RRF by Mole, Mass, Volume and other calculators related to RRF
FID RRF for Gas Samples
Calculate RRF with number of carbon atoms, hydrogen atoms, molecular weight and compressibility
FID RRF for Liquid Samples
Calculate RRF with number of carbon atoms, hydrogen atoms, molecular weight and (relative) density
FID RRF for Unknown Peaks
Calculate response factor and concentration of unknown GC peaks using FID relative response factors
FID RRF Verification
Compare the difference between Experimental RRF and Theoretical RRF
FID Peak Area Normalization
Calculate amount% for up to 6 compounds using peak area and relative response factor
FID Methanizer RRF Calculator
Determines relative response factors between CO, CO₂, and CH₄ using concentration and peak area data
Column Evaluation Calculators
Calculators for column evaluation such as resolution, theoretical plates, skewness, index…
Average Linear Gas Velocity Calculator
This calculator determines average linear gas velocity (cm/s) and outlet flow (mL/min)
Resolution Calculator
Computes peak resolution (Rs) using retention times and peak widths at half height for two adjacent peaks
Skewness Calculator
Use this calculator to determine chromatographic peak asymmetry from left and right time segments
Number of Theoretical Plates Calculator
Use this calculator to determine column efficiency from retention time and peak width at half height
Retention Factor Calculator
Use this calculator to determine the retention factor (k) from gas holdup time and analyte retention time
Retention Index Calculator
Use this calculator to determine Kovats retention index (RI) or predict retention time (RT)
Relative Polarity Calculator
Determines the polarity difference between two compounds using their retention index (RI) values
McReynolds Polarity Calculator
Determine relative polarity constants (x, y, z, u, s) from retention index data and calculate the total constant
Column Flow Calculators
Calculates column flow with different configurations
Single Column Flow Calculator
Determines outlet column flow, average linear gas velocity, and hold-up time for a single capillary column
2 x Columns in Series
Estimates the carrier gas flow across two columns in series and the pressure at the mid point
3 x Columns in Series
Estimates the carrier gas flow across three columns in series and the pressure at the mid points
2 x Columns in Series with Mid-Pressure
Estimate column flow across two column connected in series with a mid-point pressure supply
3 x Columns in Series with Mid-Pressure (1)
Estimates the carrier gas flow across three columns in series and the pressure at the mid points
3 x Columns in Series with Mid-Pressure (2)
Estimates the carrier gas flow across three columns in series and the pressure at the mid points
2-way splitter without make-up supply
Estimates the carrier gas flow across three columns in a 2 way-splitter without make-up supply configuration
2-way splitter with make-up supply
Estimates the carrier gas flow across three columns in a 2 way-splitter with make-up supply configuration
2-way combiner without make-up supply
Estimates the carrier gas flow across three columns in a 2 way-combiner without make-up supply configuration
2-way combiner with make-up supply
Estimates the carrier gas flow across three columns in a 2 way-combiner with make-up supply configuration
Other Utility Calculators
Essential utility calculators for everyday gas chromatography work.
Molar Mass Calculator
Calculate molecular weight by combining up to four different atoms and their quantities
Gas Sample Loop Calculator
Calculate how long of a tubing to cut to achieve a specific loop volume using ID or OD-Wall
Gas Cylinder Duration Calculator
This gas cylinder duration calculator estimates how long a gas cylinder will last
4-20 mA Converter
This converter allows you to convert transmitter current signals (4–20 mA) into engineering values
Pt100&Pt1000 Temperature Calculator
Estimate temperature from resistance or calculate resistance from temperature for Pt100 and Pt1000 RTD sensors
Unit Converters
Converters to convert common units (temperature, pressure, volume, length…) used in GC work
Temperature Unit Converter
Convert a temperature value instantly between Celsius, Fahrenheit, and Kelvin
Pressure Unit Converter
Convert pressure values instantly using this pressure unit converter for psi, kPa, MPa, and bar
Length Unit Converter
Convert length values instantly for millimeters, centimeters, meters, inches, and feet
Volume Unit Converter
Convert volume values instantly using this volume unit converter for µL, mL, L, cm³, ft³ and m³
Mass Unit Converter
This mass unit converter lets you quickly convert between ng, µg, mg, g, kg, and lb
Flow Rate Converter
This flow rate converter allows you to quickly convert between mL/min, L/min, mL/h, L/h, sccm, and scfm
Weight Concentration Converter
Fast conversion between Weight Fraction, Weight %, ppm (wt), ppb (wt), mg/kg, µg/kg, µg/g, and mg/g
Mole Concentration Converter
Fast conversion between Mole Fraction, Mole %, ppm (mol), ppb (mol), mmol/mol, µmol/mol and nmol/mol
Volume Concentration Converter
Fast conversion between Volume Fraction, Volume %, ppm (vol), ppb (vol), mL/L, µL/L and µL/mL
Solution Concentration Converter
Fast conversion between mg/mL, µg/mL, mg/L, µg/L, g/100 mL, mol/L, mmol/L and µmol/L
Density Unit Converter
Use this converter for fast conversion between g/mL, kg/L, kg/m³, g/L, lb/ft³ and Specific Gravity
Want to understand the theory behind these calculators?
Explore the GC Knowledge Hub for step-by-step guides and explanations.