Decibel Distance Calculator
Solve L₂ = L₁ − 20·log₁₀(r₂/r₁) step by step — free decibel distance calculator with worked examples, real-world defaults and instant answers.
Sound level fall-off with distance.
About Decibel Distance Calculator
The Decibel Distance Calculator solves L₂ = L₁ − 20·log₁₀(r₂/r₁) for you with the full working shown — every substitution, every unit, every step, exactly the way a good teacher writes it on the board. 100 dB at the speaker stack is ~76 dB thirty metres back — every doubling of distance shaves 6 dB for free, the cheapest hearing protection there is.
How to use Decibel Distance Calculator
- 1Enter your known values in the input fields (sensible real-world defaults are pre-filled).
- 2The tool substitutes them into L₂ = L₁ − 20·log₁₀(r₂/r₁) and recomputes live.
- 3Read the answer in the result box, then expand the step-by-step solution to see the full working.
- 4Copy the method into your notebook, or change inputs to explore how the result behaves.
Why use Decibel Distance Calculator?
- ✓Solves L₂ = L₁ − 20·log₁₀(r₂/r₁) instantly as you type — no submit button, no waiting
- ✓Step-by-step solution shown for every calculation, not just the final answer
- ✓Realistic example values pre-loaded so you can see a worked example immediately
- ✓100% free, no sign-up, runs entirely in your browser — your numbers never leave your device
- ✓Mobile-friendly and fast enough to use mid-homework or mid-lesson
Frequently asked questions
What formula does the Decibel Distance Calculator use?+
It uses L₂ = L₁ − 20·log₁₀(r₂/r₁). The steps section shows the formula with your actual numbers substituted, so you can follow (and verify) every stage of the calculation rather than trusting a black box.
What should I keep in mind when using this calculator?+
100 dB at the speaker stack is ~76 dB thirty metres back — every doubling of distance shaves 6 dB for free, the cheapest hearing protection there is. The law breaks indoors (reflections prop the level up) and for line sources like highways, which fade at a gentler 3 dB per doubling.
Is the Decibel Distance Calculator free to use?+
Completely free, with no sign-up or limits. All computation happens client-side in your browser, so it is fast, private, and works even on slow connections once the page has loaded.
Can I use this for homework, teaching or exam prep?+
That is exactly what it is built for. The step-by-step working mirrors how solutions are presented in class, so you can check homework, build worked examples for teaching, or practise method recall before exams.
Embed Decibel Distance Calculator on your website
Want Decibel Distance Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/decibel-distance-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Decibel Distance Calculator — ToolJolt" loading="lazy"></iframe>Related Science tools
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