If the second peak results in a value of 502.68, for example, the value for J would be 2.02 Hz. To calculate J for a duplet, simply subtract the lower value from the higher.
If we used a 500 mHz NMR machine, our peaks are at 2130 Hz and 2123.5 respectively. To get Hz, just multiply these values by the field strength in mHz. Suppose we have one peak at 4.260 ppm and another at 4.247 ppm. 3 How is MestreNova j coupling calculated?Ĭalculation of Coupling constant: The trick is that J is measured in Hz, not ppm.
