# Weather Calc

> A weather calculation tool for pilots and enthusiasts with numerous atmospheric computations. (iPhone/iPad app by Black Cat Systems.)

- Source: https://appshunter.io/ios/app/weather-calc/id305762968 (this page in markdown: same URL + `.md`)
- Developer: [Black Cat Systems](https://appshunter.io/developer/301047032)
- Category: Weather, Utilities
- Price: $0.99
- Rating: 4.50/5 from 4 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 4 MB
- Languages: American English
- Released: 2009-02-25
- Data updated: 2026-09-14
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/weather-calc/id305762968/reviews.md

## What is Weather Calc?

If you’re a pilot, you often need to make lots of weather related calculations. Now there’s an easy solution, as close as your iPhone. 

Weather Calc performs the following weather relation calculations: 
 
Altimeter Setting - compute the altimeter setting based on elevation and station pressure 
Cricket Temperature - just for fun! This lets you estimate the temperature based on the chirp rate of a cricket
Heat Index - compute the heat index based on the temperature and relative humidity 
Pressure - convert between hPa, atmospheres, psi, and inches and mm of mercury (Hg) 
Relative Humidity - compute the wet bulb and dewpoint based on the temperature, pressure, and relative humidity 
Speed Of Sound - displays the speed of sound in various units, given the temperature
Standard Atmosphere - compute the temperature, pressure, density, viscosity, speed of sound, and more 
Station Pressure - compute the station pressure based on the elevation and altimeter setting. 
Temperature - convert between degrees Fahrenheit, Celsius, Kelvin, and Rankine 
Virtual Temperature - compute the virtual temperature based on the temperature, dewpoint, and pressure 
Vapor Pressure - com[ute the saturated and actual vapor pressure, as well as relative humidity 
Wet Bulb - compute the dewpoint and relative humidity based on the temperature, pressure, and wet bulb reading 
Wind Chill - compute the wind chill based on the temperature and wind speed 
Wind Speed - convert between knots, kilometers/hour, meters/second, miles/hour, feet/second 

Buy your copy now, and let Weather Calc take the drugery out of weather related calculations.

## Key features

- Altimeter setting calculation
- Heat index computation
- Pressure unit conversion
- Relative humidity calculation
- Speed of sound display
- Wind chill computation
- Wind speed conversion

## Chart rankings

- #174 in Top Paid · Weather (US App Store)

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/weather-calc/id305762968/reviews.md

### 5/5 — An Exceptional Weather Application!!

*2023-01-01*

If you are either a pilot or a weather enthusiast, you will enjoy this app! It provides a wealth of information in a very user friendly format. Truly a hidden gem!

### 4/5 — Indispensable for an Aircraft Dispatcher

*2017-03-01*

A well used tool.
Thanks

### 4/5 — Weather Calc

*2016-08-11*

Good Basic info. Several errors in Faq. Useful.

### 5/5 — Snowflakes

*2014-12-18*

I am a retired Meteorologist recording my Weather observations every few hours. I have used this App for over a year now, and have found it to be very useful and indispensable. Highly recommended. 5 stars !

### 4/5 — Good app, needs some detail resolved.

*2009-07-11*

Good app, fast and clean, the layout needs to be a bit more logical though. For example name each calculation after what it provides you, not what you need to input. Wish there was a prefs pane for setting units, instead of changing units each time I recalculate which frequently leads to mistakes

### 5/5 — Cool hot app!

*2009-04-12*

Thanks

### 3/5 — Cool App

*2009-02-28*

Well not a bad app I must say. Needs some work but good start to a very handy app. Could be better for the price but not bad at all. Does the trick I guess. just needs fine tuning and a visual tweak.

## Frequently asked questions about Weather Calc

### What weather calculations does Weather Calc perform?

Weather Calc performs a wide range of calculations including altimeter setting, heat index, pressure conversions, relative humidity, speed of sound, wind chill, and more. It covers various atmospheric parameters relevant to pilots and weather enthusiasts.

### Is Weather Calc available on Android devices?

Weather Calc is currently supported on iPhone and iPad devices. There is no information available regarding Android support at this time.

### How often is Weather Calc updated?

The latest version of Weather Calc is 3.0, and it was last updated on July 28, 2025. This indicates a recent update, suggesting ongoing support and potential for future improvements.

### What is the price of Weather Calc?

Weather Calc is a paid application priced at $0.99. This one-time purchase grants you access to all its weather calculation features.

### What is the age rating for Weather Calc?

Weather Calc has an age rating of 4+. This means it is suitable for users aged 4 and above, with no mature content concerns.

### Does Weather Calc have ads?

No, Weather Calc does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

### What do users like about Weather Calc?

Users appreciate Weather Calc for its comprehensive suite of weather calculations and conversions, making it a valuable tool for pilots. Its ease of use and the ability to perform complex calculations quickly are frequently highlighted.

### When was Weather Calc first released?

Weather Calc was first released on February 25, 2009. It has a long history of providing weather calculation services to its users.

## Version history (last 5 releases)

### 3.0 — 2025-07-28

Bug fixes and performance improvements

### 2.0 — 2022-06-05

Updates for new iOS version

### 1.3 — 2016-07-26

Added conversions for speed of sound, and temperature vs cricket chirp rate.
Several bug fixes.

### 1.2 — 2014-06-12

Updated for iOS 7

### 1.1 — 2013-01-09

Now available for the iPad also
Updated for iOS6 and iPhone 5

## Apps similar to Weather Calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [DewPtFm](https://appshunter.io/ios/app/dewptfm/id6504697113) | — | Free | Weather |
| [PWS Monitor](https://appshunter.io/ios/app/pws-monitor/id713705929) | 4.7 (718) | Free | Weather |
| [FeelTemp](https://appshunter.io/ios/app/feeltemp/id6746193975) | 5.0 (2) | Free | Weather |
| [Wind Chill & Humid Calculators](https://appshunter.io/ios/app/wind-chill-and-humid-calculators/id6475280697) | 4.2 (25) | Free | Weather |
| [Heat Index and Wind Chill](https://appshunter.io/ios/app/heat-index-and-wind-chill/id1550107650) | 2.6 (7) | Free | Weather |
| [Heat Index Calculator Pro](https://appshunter.io/ios/app/heat-index-calculator-pro/id6476157163) | 4.7 (69) | Free | Weather |

## More apps by Black Cat Systems

- [WireCalc](https://appshunter.io/ios/app/wirecalc/id301047029)
- [Transmission Line Calc](https://appshunter.io/ios/app/transmission-line-calc/id302734281)
- [RF Link Calc](https://appshunter.io/ios/app/rf-link-calc/id303034300)
- [dB Calc](https://appshunter.io/ios/app/db-calc/id303470503)
- [Drill Calc](https://appshunter.io/ios/app/drill-calc/id304434324)
- [Photon Calc](https://appshunter.io/ios/app/photon-calc/id304436071)

All apps by Black Cat Systems: https://appshunter.io/developer/301047032

---

*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 2026-09-14.*