Shooting tools · Free
A free ballistic calculator and DOPE book in your pocket
- drag models
- G1 + G7
- holds and clicks
- MOA / mil
- free shooting tools
- 7
- no subscription needed
- $0
Bullet drop, wind drift and clicks
Enter your bullet's ballistic coefficient (G1 or G7), muzzle velocity and weight, your sight height and zero distance, then the distance to the target. Caliber gives you the elevation hold, wind hold and the number of clicks on your scope, plus remaining velocity, energy and time of flight.
- G1 and G7 drag models
- MOA or mil scopes, with your click value
- A drop chart out to the distance you choose
- Save rifle profiles for each rifle and load
Real-world conditions and shot angle
Air density changes where your bullet lands. Add temperature, altitude or station pressure, humidity, wind speed and direction, and the shot angle for uphill and downhill shots, and the solution updates.
- Temperature, altitude, station pressure and humidity
- Wind speed and direction
- Uphill and downhill shot angle
A DOPE book that lives with your rifle
Keep a DOPE card for every rifle and load, with your holds at each distance. When you confirm a hold at the range, mark it confirmed. Your DOPE cards sync to your own private iCloud, not to Caliber.
- One card per rifle and load
- Mark holds confirmed at the range
- Private: syncs only to your iCloud
Every tool in the kit
Bullet drop calculator
Drop, wind drift and scope corrections at any distance, uphill or downhill, with a full drop chart.
DOPE book
A card per rifle and load with your holds at every distance, confirmed at the range.
Uphill & downhill
Measure the slope with your iPhone and get the distance to hold for.
Distance estimator
Estimate distance from a target's size and your mil or MOA reticle.
Scope adjustment
Turn where your group landed into turret clicks.
Point-blank range
How far you can aim dead-on and still hit the vital zone.
Energy & recoil
Muzzle energy, and how hard a load kicks in your firearm.
Shot timer Pro
Time your draw, splits and drills with your iPhone's microphone.
The shot timer is part of Caliber Pro. See the shot timer.
Frequently asked questions
Is Caliber's ballistic calculator free?
Yes. The bullet drop calculator, DOPE book, uphill/downhill, distance estimator, scope adjustment, point-blank range and energy & recoil tools are all free. The shot timer is part of Caliber Pro.
Does it work for mils and MOA?
Yes. Choose MOA or mil scope units and your click value (for example ¼ MOA or 0.1 mil), and Caliber gives holds and clicks in those units.
Where do I find my bullet's ballistic coefficient?
The ammunition or bullet maker usually publishes it on the box or website, often as G1 and sometimes as G7. Use the G7 number for long, boat-tail bullets when it's available.
How accurate is the bullet drop calculator?
It's a solid starting point, but every rifle is different. Real muzzle velocity, scope height and conditions all matter, so confirm your holds at the range and record them in your DOPE book.
Does it need an internet connection?
No. The calculations happen on your iPhone.
Get Caliber free on iPhone
Safety lessons, ranges, hunting land and shooting tools, free. No ads, no tracking, and no account needed for the core app.
Free download · Optional Caliber Pro upgrade · iPhone and iPad
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CaliberBecome a safer, more skilled firearm owner. Free on iPhone and iPad.
Download on the App StoreFeatures
Guides & directories
- The four firearm safety rules
- California FSC practice test
- Texas LTC practice test
- Hunter education practice test
- Shooting range directory
- Public hunting land in Colorado
- Public hunting land in Florida
- Public hunting land in Georgia
- Public hunting land in Michigan
- Public hunting land in Minnesota
- Public hunting land in Pennsylvania
- Public hunting land in Texas
- Public hunting land in Wisconsin
Caliber is an educational and tracking tool for lawful, responsible ownership. It is not legal advice and not a substitute for in-person instruction. Caliber doesn't sell firearms, ammunition or accessories. Always follow the four safety rules and your local laws. Caliber is made by Norbrook Media LLC. Apple, the Apple logo, iPhone and iPad are trademarks of Apple Inc. App Store is a service mark of Apple Inc.