dBFS to dB SPL Converter
Convert between dBFS (digital full scale) and dB SPL (sound pressure level) using a calibration offset.
Conversion Settings
The dB SPL level that equals 0 dBFS on your monitoring chain. Typical range: 85 – 110 dB.
Enter a digital audio level (e.g. -18, -12, 0).
Enter an acoustic level (e.g. 85, 94, 110).
Reference Conversion Table
Common dBFS values at your calibration offset.
| dBFS | dB SPL | Typical Use |
|---|
What is dBFS?
dBFS (decibels relative to full scale) measures digital audio amplitude. 0 dBFS is the absolute maximum a digital system can represent — clipping occurs above it. All practical levels are negative numbers.
What is dB SPL?
dB SPL (sound pressure level) measures acoustic loudness in the real world. 0 dB SPL is the threshold of human hearing (~20 μPa). Normal speech is ~60 dB SPL; a live concert is ~110 dB SPL.
The Conversion Formula
The calibration offset is specific to your monitoring chain. Measure it with a calibrated SPL meter placed at the listening position while playing a reference sine wave (e.g. -20 dBFS pink noise). Common standards: EBU R68 (18 dB headroom, offset ~103 dB) and SMPTE (20 dB headroom, offset ~105 dB).
Summary
Convert between dBFS (digital full scale) and dB SPL (sound pressure level) using a calibration offset.
How it works
- Enter a dBFS value (typically -60 to 0) or a dB SPL value.
- Set your calibration offset — the dB SPL level that corresponds to 0 dBFS on your monitoring chain.
- The converter calculates the equivalent value using: dB SPL = dBFS + Calibration Offset.
- A reference table shows common dBFS values converted at your chosen offset.
- Typical calibration offsets range from 85 to 100 dB for studio monitors.
Use cases
- Calibrate studio monitors to a target listening level.
- Verify that a mix will play at the intended loudness on a specific system.
- Convert SPL meter readings back to dBFS headroom for gain staging.
- Understand the relationship between digital levels and acoustic output.