Rf Value Calculator
🔋 Rates & Electrochemistry. Use the Rf value (chromatography) formula to find rf value, spot distance, solvent front distance: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Rf value | no unit |
| Spot distance | cm |
| Solvent front distance | cm |
Worked example
Find the rf value when Spot distance = 4.8 cm, Solvent front distance = 8 cm.
Using Rf = (distance moved by the spot)/(distance moved by the solvent): Rf value = 0.6.
Frequently asked questions
What is the formula for Rf value (chromatography)?
Rf = (distance moved by the spot)/(distance moved by the solvent).
What do the letters stand for, and what units are used?
Rf value, Spot distance in cm, Solvent front distance in cm.
How do you calculate rf value?
Put the values into Rf = (distance moved by the spot)/(distance moved by the solvent). For example, with Spot distance = 4.8 cm, Solvent front distance = 8 cm, rf value = 0.6.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (rf value, spot distance, solvent front distance) and fill in the others: it rearranges the formula for you.
