# FDR Calculator — Fire Danger Index Calculator > Professional fire danger index calculator with real-time weather integration and action guidance. (iPhone/iPad app by Alan Richert.) - Source: https://appshunter.io/ios/app/fdr-calculator/id527055670 (this page in markdown: same URL + `.md`) - Developer: [Alan Richert](https://appshunter.io/developer/527055673) - Category: Weather, Utilities - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.0 · 35 MB - Languages: American English - Released: 2012-05-22 - Data updated: 2026-08-24 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/fdr-calculator/id527055670/reviews.md ## What is FDR Calculator? PROFESSIONAL FIRE RISK ASSESSMENT MADE SIMPLE Calculate Fire Danger Ratings instantly with precision and confidence. Designed for fire management professionals, land managers, and safety authorities who need accurate fire risk assessments in the field. WEATHER PRO SUBSCRIPTION UNLOCKS ◆ Real-time weather data integrated directly into FDR calculations ◆ Automatic location detection or search any location worldwide ◆ Complete weather history and forecasts for informed planning ◆ Automatic FDR ratings - weather data updates calculations instantly ◆ No more manual data entry - let Weather Pro do the work REAL-TIME FDR CALCULATION ◆ Instant Fire Danger Index calculations based on weather conditions ◆ Professional-grade algorithms for accurate risk assessment ◆ Visual color-coded danger levels (Blue, Green, Yellow, Orange, Red) ◆ Manual calculator always available for offline use INTERACTIVE GAUGE DISPLAY ◆ Beautiful visual gauge showing current fire danger level ◆ Intuitive interface with easy-to-read results ◆ Tap gauge for detailed action recommendations COMPREHENSIVE ACTION GUIDANCE ◆ Detailed recommendations for each danger level ◆ Fire behavior predictions and suppression strategies ◆ Prevention guidelines and aircraft management protocols ◆ Disaster management procedures for high-risk conditions FLEXIBLE WEATHER INPUT Weather Pro Mode (Subscription): ◆ Automatic real-time weather updates ◆ Current location or custom location search ◆ Historical data and multi-day forecasts ◆ Set-and-forget automated monitoring Manual Calculator: ◆ Temperature, humidity, and wind speed sliders ◆ Days since rain and rainfall amount tracking ◆ Precise manual input options for exact values ◆ Real-time calculation updates as you adjust parameters ◆ Works completely offline PERFECT FOR: ▶ Fire management authorities ▶ Emergency services personnel ▶ Land and forest managers ▶ Agricultural professionals ▶ Safety and risk assessment teams ▶ Anyone responsible for fire prevention planning PRIVACY-FIRST DESIGN: ▶ All calculations performed locally on your device ▶ Minimal data collection - only for weather services when using Weather Pro ▶ Manual calculator works completely offline with no data transmission ▶ Weather Pro data encrypted and secure ## Key features - Instant Fire Danger Index calculations - Real-time weather data integration - Visual color-coded danger levels - Detailed action recommendations - Manual calculator for offline use - Automatic location detection ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Weather Pro (Monthly) | $1.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Enable Local Weather | Free | one-time | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/fdr-calculator/id527055670/reviews.md ### 2/5 — Weather update faulty *2016-12-02* App appears to be accurate and easy to use, clicking on weather tab gives three choices - none of which work and crash app once selected, how about ability to select local weather sources and then automatic update app fdr, also alarm to trigger at a nominated for please, cheers ## Frequently asked questions about FDR Calculator ### What is FDR Calculator? FDR Calculator is a professional tool designed to instantly calculate Fire Danger Ratings. It uses professional-grade algorithms and integrates real-time weather data to provide accurate fire risk assessments. ### Does FDR Calculator have ads? No, FDR Calculator is ad-free. The app is free to download and use, with an optional subscription for advanced weather features. ### What are the subscription options for FDR Calculator? The 'Weather Pro' subscription offers real-time weather data, automatic location detection, weather history, and forecasts for $1.99 per month, with a 3-day free trial. ### Can I use FDR Calculator offline? Yes, the manual calculator feature in FDR Calculator works completely offline. You can input weather parameters manually to get instant calculations without an internet connection. ### What devices support FDR Calculator? FDR Calculator is available for iPhone, iPad, and iPod. It is designed for users who need to perform fire risk assessments in the field. ### How often is FDR Calculator updated? The app was last updated on October 20, 2025, with version 3.1.0. This indicates regular updates to ensure functionality and accuracy. ### What kind of action guidance does FDR Calculator provide? FDR Calculator provides detailed recommendations for each danger level, including fire behavior predictions, suppression strategies, prevention guidelines, and disaster management procedures. ### Is my data safe with FDR Calculator? Yes, FDR Calculator is designed with privacy in mind. All calculations are performed locally on your device, and minimal data is collected, only for weather services when using the Weather Pro subscription. ## Version history (last 5 releases) ### 3.2.0 — 2026-06-07 This update makes Fire Danger Ratings more accurate and the app smoother to use. ◆ More accurate Fire Danger Ratings — we refined how ratings are calculated, especially during long dry spells, so the numbers you rely on are more dependable. ◆ See today at a glance — a new Today summary on the weather screen shows the day's high and low plus the peak fire danger expected today, alongside the current conditions. ◆ More weather choice — you can now choose OpenWeatherMap as an alternative weather source. ◆ Better location search — finding a place is faster and more accurate, with cleaner, more consistent location names throughout the app. ◆ Smoother location handling — the app starts up more reliably, handles location permissions more gracefully, and lets you jump straight to your recent locations. ◆ Refreshed weather icons — a cleaner, more consistent set of weather icons across every weather source. ◆ Clear cached data — a new option in Settings to clear saved weather data and recent searches. ◆ Under the hood — performance, security, and stability improvements. Thanks for using FDR Calculator — we'd love your feedback! ### 3.1.0 — 2025-10-20 NEW: WEATHER PRO SUBSCRIPTION UNLOCKS ◆ Real-time weather data integrated directly into FDR calculations ◆ Automatic location detection or search any location worldwide ◆ Complete weather history and forecasts for informed planning ◆ Automatic FDR ratings - weather data updates calculations instantly ◆ No more manual data entry - let Weather Pro do the work UNITS SYSTEM ◆ Select Metric or Imperial units system UPDATES: ◆ Minor fixes and improvements ### 3.0.2 — 2025-09-15 Minor fixes and improvements. ### 3.0.1 — 2025-07-21 Minor fixes and improvements. ### 3.0 — 2025-07-07 MAJOR UPDATE - Complete Makeover Visual Redesign: - Modern, professional interface design - Enhanced color scheme for better accessibility - Improved typography and visual hierarchy - Polished user interface elements Performance Improvements: - Faster calculation engine for instant results - Enhanced stability and error handling - Smoother animations and interactions Enhanced User Experience: - Intuitive navigation and streamlined interface - Improved slider controls with manual entry options - Better responsive design across all devices - Enhanced accessibility features Privacy & Control: - Advanced privacy settings with user control - Transparent data handling policies - Full offline functionality ## Apps similar to FDR Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [WeatherGopher](https://appshunter.io/ios/app/weathergopher/id6758357560) | — | Free | Weather | | [MAPDEFIRE](https://appshunter.io/ios/app/mapdefire/id6746377146) | — | Free | Weather | | [Wild Fire Predictor](https://appshunter.io/ios/app/wild-fire-predictor/id6747255503) | — | Free | Weather | | [GeoWeather - Alerts & Tracker](https://appshunter.io/ios/app/geoweather-alerts-and-tracker/id6761234024) | — | Free | Weather | | [FragoWeather.](https://appshunter.io/ios/app/fragoweather/id6742792406) | — | Free | Weather | | [OutCast - Best Time to Go Out](https://appshunter.io/ios/app/outcast-best-time-to-go-out/id6758654301) | — | Free | Weather | ## More apps by Alan Richert - [EWS Mobile](https://appshunter.io/ios/app/ews-mobile/id1451439723) - [Aviatter](https://appshunter.io/ios/app/aviatter/id1595625341) All apps by Alan Richert: https://appshunter.io/developer/527055673 ## Related topics [fdr calculator](https://appshunter.io/ios/topics/fdr-calculator) · [fdr](https://appshunter.io/ios/topics/fdr) --- *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 2026-08-24.*