Sound Level Converter
Compare sound pressure, SPL, phon, and sone in one tool
音圧レベル変換
変換結果
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変換結果
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一括変換結果
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▶ 換算表
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メモ
About Sound Level Converter
The Sound Level Converter calculates by converting your input to a shared reference value, then recalculates all supported units from that basis.
Supported Units: - dB SPL (Sound Pressure Level): A logarithmic scale with 20 μPa as the reference (hearing threshold) - Pascal (Pa) and Micropascal (μPa): Direct physical sound pressure measurements - Phon (phon): Equal-loudness perception scale (frequency-dependent at 1 kHz reference) - Sone (sone): Subjective loudness perception (1 sone = 40 phons)
About Approximations: - Phon is approximated as equal to dB SPL (frequency dependence is not considered here) - Sone is estimated from phon using the standard formula: sone = 2^((phon−40)/10) - These results are educational approximations, suitable for acoustic design and rough comparisons
When a conversion is approximate, explanatory notes are included to keep the tool practical for learning and quick reference work.
How to use Sound Level Converter
- Enter the number you want to convert
- Choose the source unit from the dropdown list
- Review the converted values for all supported units in the results table
- Use batch mode to convert multiple values at once
Benefits of Sound Level Converter
- Shows all supported units side by side to reduce conversion mistakes
- Updates instantly as you type for quick comparison and adjustment
- Includes approximation notes when the relationship is not strictly linear
- Runs entirely in the browser with no data collection or installation required
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