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Sound Insulation Calculator

Science & Engineering

Mass law R = 20lg(mf) - 48, single/double leaf with air gap

Quick Answer

Sound Insulation Calculator: Mass law R = 20lg(mf) - 48, single/double leaf with air gap. Sound Insulation Calculator uses standard science & engineering formulas to compute accurate results instantly.

Panel & wave

kg/m²
Hz
Sound reduction R33.42 dB

Below the 45dB party-wall requirement — thicken or build double leaf

Calculation

  1. 1R = 20·lg(m·f) − 48
  2. 2= 20·lg(23.55 × 500) − 48
  3. 3≈ 33.42 dB
Mass law (random-incidence empirical form): doubling surface density adds ~6dB, doubling real thickness ~4.5dB. Typical densities: 12mm gypsum 9.5, 10mm glass 25, 3mm steel 23.55, 20mm wood 13, 240mm brick wall ≈432 kg/m². Double-leaf cavities add 5-10dB; even a 1mm gap can drop a 45dB wall below 30dB — seal everything. The law overestimates heavy walls; rely on measured Rw. Coincidence-effect dips reduce insulation near critical frequency.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Sound Insulation Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Sound Insulation Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Mass law R = 20lg(mf) - 48, single/double leaf with air gap.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Sound Insulation Calculator formula

Sound Insulation Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Sound Insulation Calculator?
Open the page and fill in the input fields — results update automatically. Mass law R = 20lg(mf) - 48, single/double leaf with air gap.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Sound Insulation Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/soundproof

Results provided by this tool are for reference only and do not constitute professional advice.