Partition coefficient to log P
Type a value in P to get it in log P instantly.
0.301log P
That's 2.3× as greasy as caffeine, while aspirin is 7.7× greasier. About 66.67% of it ends up in the oily layer.
Convert the other way: log P to P
What it means
Where does it go?
Log P is for the neutral molecule. For anything that ionizes, log D at a stated pH is the figure that matters in the body.
The math
How to convert P to log P
Log P is a logarithm of the ratio: P = 10^(log P), and the share in octanol is P ÷ (1 + P) × 100 percent. The free energy of transfer is −5.708 × log P kJ/mol.
Example: 2 P = 0.30103 log P.
Every unit
Your partition in every unit
Tables
P to log P conversion table
| P | log P |
|---|---|
| 0.001 P | -3 log P |
| 0.01 P | -2 log P |
| 0.1 P | -1 log P |
| 1 P | 0 log P |
| 10 P | 1 log P |
| 100 P | 2 log P |
| 1,000 P | 3 log P |
| 10,000 P | 4 log P |
| 100,000 P | 5 log P |
| 1,000,000 P | 6 log P |
| 100,000,000 P | 8 log P |
log P to P conversion table
| log P | P |
|---|---|
| -3 log P | 0.001 P |
| -2 log P | 0.01 P |
| -1 log P | 0.1 P |
| 0 log P | 1 P |
| 1 log P | 10 P |
| 2 log P | 100 P |
| 3 log P | 1,000 P |
| 4 log P | 10,000 P |
| 5 log P | 100,000 P |
| 6 log P | 1,000,000 P |
| 8 log P | 100,000,000 P |
Quick answers
Quick answers
- How many log P is 1 P?
- 1 P is 0 log P.
- How many log P is 10 P?
- 10 P is 1 log P.
- How many log P is 2 P?
- 2 P is 0.30103 log P.
The units
About these units
Partition coefficient (P)
The plain ratio: how many times more sits in the octanol.
Log P (log P)
The base-ten logarithm of the octanol–water ratio.
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