Speed of Light Calculator
⚛ Modern physics. Use the Speed of light formula to find frequency, wavelength λ: pick the value you want, type the others, and the answer updates as you go.
Frequency6 × 10¹⁴ Hz
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 |
|---|---|
| Frequency | Hz |
| Wavelength λ | nm |
Worked example
Find the frequency when Wavelength λ = 500 nm.
Using c = fλ: Frequency = 6 × 10¹⁴ Hz.
Frequently asked questions
What is the formula for Speed of light?
c = fλ.
What do the letters stand for, and what units are used?
Frequency in Hz, Wavelength λ in nm.
How do you calculate frequency?
Put the values into c = fλ. For example, with Wavelength λ = 500 nm, frequency = 6 × 10¹⁴ Hz.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (frequency, wavelength λ) and fill in the others: it rearranges the formula for you.
