Kite Force - Pull Calculator

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: [email protected]

Website: https://prodirt-llc.github.io/kiteforce/

Built by kite flyers, for kite flyers. Made in Virginia, USA.