Pure minor third

Pure minor third · 6:5 → 440 × 6/5 = 528 Hz

Fix a reference frequency before comparing tunings. An octave doubles frequency. Convert a frequency ratio to cents with 1200 × log₂(ratio).

Example

Read the ratio alongside the worked calculation. · 6:5 / 440 × 6/5 = 528 Hz

Read the ratio alongside the worked calculation.

6:5 440 × 6/5 = 528 Hz

How does a frequency difference differ from a ratio?

Answer

Moving the same interval to another pitch preserves the ratio. The difference in hertz can change.

Subject-expert review pending.