Safe Room Size Calculator – Online Occupancy & Ventilation Check
Enter number of people and desired duration to estimate the minimum square footage and ventilation CFM for a residential storm shelter.
UD5 Toolkit
Enter number of people and desired duration to estimate the minimum square footage and ventilation CFM for a residential storm shelter.
Countdown timer for applying a heating pad. Includes recommended max session. Prevent burns.
Countdown timer with alerts for boiling pacifiers, bottles, or pump parts. Follow recommended times. Local audio alarm.
Simple grid canvas to sketch your home's layout and mark escape routes and meeting point. Print for practice. Local only.
Build a categorized list of possessions with value, serial number, and photo (local). Export for insurance purposes. Private.
Calculate number of charcoal briquets for Dutch oven cooking temp. Also includes multi-stage cooking time.
Enter skin type and UV index to estimate time to sunburn. Visual countdown reminder to reapply sunscreen or seek shade. Educational only.
Enter a city name to fetch its current Air Quality Index from public APIs. Color-coded health warning. No login.
Select bird species to see recommended maximum bar spacing to prevent escape or injury. Quick reference.
Set weekly reminders to soak your air plants. Timer and drying instructions included.
Enter nozzle type and surface area to get optimal spray distance, sweep speed, and estimated cans needed. Prevent runs and drips.
Randomly picks an indoor activity from a curated list sorted by age. No materials, no prep ideas included. Banish boredom.
Calculate how many gallons of water to store based on household size and days. Preparedness aid.
Enter green, yellow, gray letters from your Wordle guess and get a filtered list of possible words. Your secret weapon. Local logic only.
Set a custom watering frequency reminder for succulents, with seasonal adjustment. Visual icon. Works offline after setup.
Convert between currencies using manually updated or default rates. Great for estimation when offline. Local settings.
Enter the recipe's wattage and your microwave's wattage to convert cooking time. Prevent burnt or cold food.
List of major annual meteor showers with next peak date and moon phase prediction. Stargazing planner.
Input room dimensions and number of coats to estimate how many gallons/litres of paint you need. Excludes doors/windows optionally. Local calculator.
Set interval reminders to reapply sunscreen every 2 hours (or custom) with sound and notification. Protect kids' skin.
Add realistic rain, snow, or fog to any photo. Control intensity and direction. Download the atmospheric result.
See how making extra payments reduces tenure and saves interest. Visual graph comparing original vs prepaid amortization. Purely local financial tool.
Calculate dew point or relative humidity from temperature and the other parameter. Also computes wet-bulb temperature. Meteorology reference.
Tap when you see lightning, tap again when you hear thunder. Calculates how far away the storm is in miles/km. Important outdoor safety tool.
Select your latitude and day of year to see sun path and identify spots with the most direct sunlight for solar garden lights. Simple visual tool.
Enter cabinet width and find optimal placement for knobs or pulls. Visual layout with grid. Achieve professional look.
Add plants and track when you last watered them. Get a simple visual alert when it's time to water. Local storage.
Plan scenes with a simple shot list and track frames taken. Calculate total play time. Local tool.
Enter your altitude to adjust canning processing times or pressure. Prevent botulism. Based on USDA guidelines. Essential for home canners.
Calculate the series resistor and power dissipation for a zener diode voltage regulator. Input voltage, output voltage, load current. Local only.