Kite Force - Pull Calculator

Kite pull force calculator with live wind, air density and line safety limits.

Calculate the exact pull force your kite generates under real-world conditions. Essential for line selection, safety planning, and understanding your kite's performance limits before you're holding the line.

🪁 KITE FORCE — Kite Pull Force Calculator

⚡ SMART FORCE CALCULATION
• Pull force in Newtons, Pounds and Kilograms
• Line recommendation: at least 2x the pull, rounded up to a standard line size
• Worst-case analysis against your kite's rated wind ceiling
• Air density from live temperature and pressure, not a sea-level assumption
• Force table across 10, 15, 20, 25 and 30 mph so you know what's coming as wind builds
• Adjustable angle of attack for tuning past the shape defaults
• A clear verdict for the wind right now: Good to fly, Marginal, Getting gusty or Too windy

🗂️ YOUR KITE LIBRARY
• 13 kite types: Delta, Box, Parafoil, Diamond, Sled, Rokkaku, Dual-Line, Quad-Line, Bols, Bouncing Buddy, Banner, Line Laundry and a generic Other
• Each with a tuned drag coefficient and the right measurement fields for its shape
• Photos, maker, wind rating, cost and last flown date
• Care reminders: flag a kite as Needs repair, Needs cleaning or Needs drying, with a note

⭐ WISHLIST (NEW)
• Keep the kites you're thinking about, with the shop link and price
• Fit check: the wind it flies in, how hard it pulls, the line it needs, and whether it fills a gap in the kites you own
• Wishlist kites don't count toward the free kite limit
• Bought it? One tap moves it into your kites

📷 SPOTTED ONE (NEW)
• Saw a kite you liked? Snap it with your phone's own camera (zoom works) or pick a photo you already took
• It starts a wishlist entry with the date it was spotted
• Identify with Google Lens sends the photo to Lens so you can find out what it is

🌤️ LIVE WEATHER
• Wind hour by hour for the next 24 hours (the number most weather apps bury)
• Current conditions via GPS: wind speed, direction, temperature and pressure
• Interactive Windy.com wind map and a 5-day forecast
• Manual override when needed

🧺 LINE LAUNDRY
• Add windsocks, flags and banners to your force calculation
• Small / Medium / Large, or pull from a saved kite

📋 SESSION LOGGING
Start a session and the app records condition snapshots over time with location, so you can compare what a flight felt like against what the numbers predicted.

📅 KITE EVENTS
Upcoming kite festivals and events, sorted by distance from you.

📐 METRIC & FREEDOM UNITS
mph ↔ m/s, °F ↔ °C, inHg ↔ hPa, in ↔ cm. Everything updates instantly.

💾 BACKUP & SHARING
• Export and import your whole collection, photos included
• Share single kites with other flyers

📱 NO ANDROID PHONE?
Kite Force also runs in the browser, free: https://kiteforce.web.app
On an iPhone, add it to your home screen and it works like an app. Import a backup from this app to bring your kites along.

🔬 THE SCIENCE
Force is computed with the standard aerodynamic equation:
F = ½ × ρ × V² × Cd × A
Air density (ρ) comes from the ideal gas law using live temperature and pressure. Drag coefficients (Cd) are tuned per kite type (Quad-Line 1.6, Parafoil 1.5, Delta 0.95, Box 0.9) and adjusted for angle of attack.

⚠️ SAFETY
• Warnings when the wind is too low or too high for your kite
• A warning when your line is too light for the pull
• Worst-case modeling at the kite's rated max wind

🌐 WORKS OFFLINE
All calculations run on your device. Live weather, maps and events need a connection.

🔓 FREE VS UNLIMITED
Free includes the full calculator, live weather, forecasts, wind map, session logging, events, the wishlist and up to 10 saved kites.
A one-time Unlimited purchase adds:
• Unlimited saved kites
• Google Drive backup
• No backup reminders
No subscriptions. No ads. No tracking. Your gear shouldn't expire.

🆘 SUPPORT
Email: prodirt.co@gmail.com
Website: https://prodirt-llc.github.io/kiteforce/
Built by kite flyers, for kite flyers. Made in Virginia, USA.