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How to Measure Noise with a Sound Level Meter

You can measure decibels with a dedicated sound level meter or a phone app. A few simple habits make your readings far more accurate.

📏 Distance & Loudness

Key points

  1. Use a sound level meter or a calibrated phone app set to dBA.
  2. Hold the microphone at arm’s length, pointed at the source, away from your body.
  3. Measure at the distance that matters — e.g. where your ears actually are.
  4. Take several readings and note both the average and the peak level.
  5. Remember sound drops about 6 dB each time you double the distance from the source.

FAQ

Are phone decibel apps accurate?

Good apps are within a few dB for general use, but they are not calibrated instruments. For legal or occupational measurements, use a certified meter.

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