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dB Calc

by Black Cat Systems

  • Reference
  • Paid
  • Zombie
View on the App Store
Rating
0.0
0 ratings · Laos storefront
Last update
Jul 9, 2025
Version 3.0
Size
1 MB
Category
Reference
Tracked since
Oct 10, 2026

Estimated revenue

A model estimate with a likely range, not a reported figure.

No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.

How this estimate is made

Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.

Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.

Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.

Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.

Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.

Full method

Screenshots

As shown on the App Store listing.

About this app

Text from the App Store listing.

Need to quickly convert between various RF signal measurement units? dB Calc performs lots of decibel related conversions:

Decibel / Neper / Ratio Conversions:
Enter in either the dB, Np (nepers), power or voltage ratio, and the other values will be calculated.

Decibel / Power / Voltage Calculations:
Enter in the one known value, and the others will be calculated. Select the correct units before entering in the value. You can change the units of the displayed (calculated values) by selecting the new units. Enter in the resistance before entering in the known value.

The following units are available:
dBmW - dB ref to 1 mW power
dBuV - dB ref to 1 uV
dBu - dB ref to 0.7746 V (audio)
dBV - dB ref to 1 V

uW - microwatts
mW - milliwatts
W - watts

uV - microvolts
mV - millivolts
V - volts

RMS Waveforms Conversions:
Conversion between rms, peak, peak-peak voltage and current values for a user entered resistance. Sine, square, and triangle waveforms are supported.

Get your copy of dB Calc today, and take the hassle out of dB related conversions.

What’s new

Release notes for the latest version, as written by the developer.

v3.0

Changes and improvements for new iOS updates.

Rank history

Daily position in the Italy charts. #1 is at the top.

Best rank
#4
Current rank
#4
Days charting
1 of 7

On the charts today

Small & simple score

How realistic it is for a small team to build something like this.

61/100

Not flagged as small & simple

  • Developer size0% · 25

    Developer: 18 apps on the charts

  • Audience size– · 20

    No data, weight redistributed

  • App size100% · 10

    Size: 1 MB

  • Price model100% · 15

    Price model: paid

  • Demand proof80% · 30

    Best rank #4, 3 countries

An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2

How the score works

Version history

  • 3.0LatestReleased Jul 9, 2025