Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Peak one frequency (Hz)

Required number input.

Peak two frequency (Hz)

Required number input.

Peak separation (Hz)

Optional number input.

Compute the scalar coupling constant in Hz either from a validated peak separation or from two distinct peak frequencies. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Coupling constant (Hz)

The resulting coupling constant returned as a number.

• NMR shifts, integrations, and couplings depend on nucleus, field, solvent, temperature, referencing, pulse sequence, relaxation, exchange, and spectral processing. A compact calculation does not assign a structure or resolve overlapping signals.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Chromatographic Resolution

  Compute chromatographic resolution Rs as twice the retention time separation divided by the summed baseline peak widths.

• First Order Half-Life

  Compute the half-life of a first order reaction as the natural logarithm of two divided by the rate constant.

• Integration Ratio

  Normalize two NMR integrals so the smaller value becomes one and report the proton ratios rounded to two decimals.