# dB Calculator Plus — Sound Pressure Intensity Level

> Sound Pressure Intensity Level (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/db-calculator-plus/id1409328777 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 13 · 1 MB
- Languages: American English
- Released: 2018-07-29
- Data updated: 2026-05-30
- User reviews in markdown: https://appshunter.io/ios/app/db-calculator-plus/id1409328777/reviews.md

## What is dB Calculator Plus?

dB Calculator is a physics/math calculator designed to find sound pressure level (SPL) and sound intensity level (SIL) in decibels quickly and easily.

Features:
- Instant calculation.
- Results are copyable to other apps.
- Formulas are included as a reference.
- Support up to 16 decimal places.
- Works seamlessly on both iPhone and iPad.
- Lightweight, compact app optimized for everyday use.
- Ad-free and built with privacy in mind.

Sound pressure level (SPL)
SPL is a ratio of the absolute sound pressure to a reference level, usually the Threshold of Hearing, or the lowest intensity sound that can be heard by most people. SPL is measured in decibels (dB) due to the broad range of intensities we can hear.

Formula:
SPL = 20 * log (P/Pref)

Where:
SPL - is the sound pressure level in dB
P - is the sound wave pressure, measured in pascals
Pref - is the reference value of sound pressure, typically assumed to be equal to 0.00002 Pa

Sound intensity level (SIL)
Sound intensity is defined as the sound power per unit area, typically measured in the air at a listener's location. The basic units are watts/m² or watts/cm².

Formula:
SIL = 10 * log (I/Iref)

Where:
SIL - is the sound intensity level in dB
I - is the sound intensity in watts per squared meter
Iref - is the reference value of sound intensity, typically assumed to be equal to 10⁻¹² W/m²

Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.


## Version history (last 4 releases)

### 1.3 — 2026-03-08

- Updated for the newest devices.
- Minor bugs fixed.

### 1.2 — 2024-01-11

- Updated for the newest devices.
- Minor UI update.
- Minor bugs fixed.

### 1.1 — 2020-11-13

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-07-17

No release notes.

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All apps by Nitrio: https://appshunter.io/developer/321121189

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-30.*