Model specificity constants, shifts, and turnover behavior. Enter inputs, export reports, and inspect saturation curves. Build stronger decisions with reliable catalytic performance estimates today.
The chart shows Michaelis-Menten saturation across the selected substrate unit.
| Sample | kcat (s^-1) | Km (uM) | Efficiency (M^-1 s^-1) | Interpretation |
|---|---|---|---|---|
| Catalyst A | 80 | 40 | 2.00e+6 | Strong substrate handling |
| Catalyst B | 12 | 120 | 1.00e+5 | Moderate efficiency |
| Catalyst C | 250 | 10 | 2.50e+7 | Very high performance |
| Catalyst D | 3 | 300 | 1.00e+4 | Low-end catalytic response |
kcat / Km
Vmax = kcat × [E]t
v0 = (Vmax × [S]) / (Km + [S])
Turnover Time = 1 / kcat
[S] at half Vmax = Km
All concentration inputs are converted to molar units internally. Output rates are converted back to the chosen substrate unit for easier reading.
It measures how effectively a catalyst converts substrate at low substrate concentration. The value combines turnover speed and substrate affinity through kcat divided by Km.
A high turnover number alone can mislead. If Km is also high, the catalyst may need much more substrate before operating efficiently.
The curve approaches Vmax. Once most active sites are occupied, more substrate gives smaller gains in velocity, producing a saturation shape.
Km is the substrate concentration that gives half the maximum rate. It is often used as a practical indicator of effective substrate demand.
Diffusion sets a physical upper bound for how quickly molecules can find each other. Comparing against that ceiling helps contextualize performance.
No. It uses the initial rate as a short-interval estimate. As substrate depletes or product accumulates, the real average rate usually drops.
Yes. The calculator converts all concentration units to molar values internally, then returns display values in the selected substrate unit.
Use it as a screening aid, not a final verdict. Experimental conditions, inhibition, temperature, and measurement quality still matter.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.