Michaelis-Menten Equation Calculator

The Michaelis-Menten Equation Calculator solves the fundamental equation of enzyme kinetics — the relationship between substrate concentration and reaction speed — used in biochemistry, pharmacology, and drug development. Select what you want to Solve for (Reaction Velocity, Vmax, Km, or Substrate Concentration), then enter the known values to get your Calculated Value. Secondary outputs include Enzyme Saturation percentage and Velocity at Km.

μmol/min
μM
μM
μmol/min

Results

Calculated Value

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Enzyme Saturation

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Velocity at Km

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Frequently Asked Questions

What is the Michaelis-Menten equation?

The Michaelis-Menten equation describes enzyme kinetics: v = (Vmax × [S]) / (Km + [S]). It shows how reaction velocity changes with substrate concentration for enzyme-catalyzed reactions.

What does Km represent in enzyme kinetics?

Km is the Michaelis constant, representing the substrate concentration at which the reaction velocity is half of Vmax. Lower Km indicates higher enzyme affinity for the substrate.

How do I calculate Vmax from experimental data?

Vmax can be determined by measuring reaction velocities at various substrate concentrations and fitting the data to the Michaelis-Menten equation, or by using linearization methods like Lineweaver-Burk plots.

What does enzyme saturation mean?

Enzyme saturation occurs when all enzyme active sites are occupied by substrate. At saturation, increasing substrate concentration doesn't increase reaction velocity, which approaches Vmax.

How accurate is the Michaelis-Menten model?

The model is accurate for simple enzyme reactions with single substrates under steady-state conditions. It may not apply to complex reactions with multiple substrates or allosteric enzymes.

What units should I use for the calculations?

Common units include μM or mM for concentrations, and μmol/min or mol/s for reaction rates. Ensure all units are consistent throughout your calculations.