EC50 Calculator
EC50 Calculator
Calculate EC50 from concentration–response data using four-parameter logistic regression.
⚙️ Calculation Settings
📘 4PL Model
The calculator fits a four-parameter logistic dose-response model:
Y = Bottom + (Top − Bottom) / [1 + (EC50 / X)Hill Slope]
EC50 is the concentration producing 50% of the maximal response between the fitted Bottom and Top values.
📊 Concentration–Response Data
| # | Concentration | Response (%) | Action |
|---|
📈 Results
EC50
—
Hill Slope
—
Top
—
Bottom
—
R²
—
50% Response
—
Data Points
—
Model
4PL
📉 Dose–Response Curve
The x-axis is displayed on a logarithmic concentration scale.
Points represent experimental observations and the curve represents
the fitted 4PL model.