Michaelis-Menten KineticsChemistry
Michaelis-Menten Enzyme Kinetics & Catalytic Efficiency Calculator
Calculate initial enzyme reaction velocity (v0), turnover frequency (kcat), and catalytic efficiency (kcat/Km) from substrate concentration [S], Km, and Vmax.
Calculated Result
Initial Velocity (v0)
60μM/s
Calculator Inputs
μM/s
Quick select:
μM
Quick select:
μM
Quick select:
Initial Velocity (v0)
60μM/s
Turnover Number (kcat)
2,000 s⁻¹
Fraction of Vmax Achieved (%)
60 %
High Enzyme Saturation ([S] >= Km): Operates above half-maximal speed, transitioning toward zero-order substrate-independent kinetics.
Enzyme Substrate Saturation Profile
Velocity v0
60 μM/s(38%)
vmax_rate
100(63%)
Standard biochemistry and molecular pharmacology tool for hyperbolic enzyme kinetics and saturation modeling.
Calculation Methodology
Michaelis-Menten Equation: v0 = (Vmax * [S]) / (Km + [S]). When [S] = Km, v0 = 0.5 * Vmax. Turnover Number: kcat = Vmax / [E]total. Catalytic Efficiency = kcat / Km (M^-1 s^-1).
Frequently Asked Questions
A low Km indicates very high binding affinity for its substrate, meaning the enzyme achieves maximum catalytic rates even at trace substrate concentrations.
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