Field Crosswind Computer · iOS & Android

One number.
Every wind.

A field crosswind calculator for long-range & precision rifle shooting.

Place your wind stations across the range. Ventux weights every reading by real time-of-flight and collapses it into one crosswind value — ready for ChairGun or any ballistic solver.

Coming Soon

App Store Google Play See how it works

2.0–2.4 m/s

Current call

TOF

Real weighting

.308 · 168gr loaded

Berm 3 — AM

Saved · 3 stations

How it works

Up and running before your first shot.

Place your stations

Tap the radar to drop a wind reading at any range between you and the target. Drag to reposition, drag the arrowhead to set direction and speed.

Get one number

Ventux weights every station — by distance, or by your bullet's real time-of-flight — and collapses them into one equivalent crosswind.

Enter it in ChairGun

R or L, in m/s. One number, ready for your ballistic solver — no mental math downrange.

Features

Everything you need to call the wind.

Wind Stations

Tap the radar to drop a wind reading anywhere between you and the target. Drag the dot to reposition, drag the arrowhead to set direction and speed in one gesture.

Time-of-Flight Weighting

Load your bullet's BC and muzzle velocity and Ventux weights every station by how long the bullet actually spends near it — not just a distance guess.

Gust Bracket

Set a gust minimum and maximum on any station and see the full result — nominal, low, and high crosswind — in one glance.

LAG & Hold

A load profile adds a LAG readout — the angular hold derived from your bullet's real time-of-flight lag, in mil and MOA.

Shot Spread

See the group-size cost of a gust bracket, in cm, mil, and MOA — before you break the shot.

Density Altitude

Set HOME (where your DOPE was built) vs. CURRENT (today's range) and see ΔDA — know exactly when your dope needs a rebuild.

Field Guide

Mirage lean, flag angle, and flora movement reference — read the wind like you wrote the DOPE, no instruments needed.

Save Scenarios

Store a stage's full wind picture — every station, the target range — and reload it instantly next time you're on that berm.

Wind Log

Every solved shot can be logged, with a timestamped history you can review later.

Three Palette Modes

Day, Night (red-shifted, keeps you dark-adapted), and Sun (high-contrast for bright glare).

Fully Offline & Private

No network connection, no account, no cloud sync. Everything lives on your device.

One-Handed Field Gestures

Built for use in the field, not at a desk. Tap to add, drag to edit — one hand, one motion.

Field Guide

Read the wind
like you wrote the DOPE.

A field guide built for the field — not a PDF you forgot to download. Mirage, flags, flora, and density altitude, all in your pocket, all offline.

Mirage & flag reference

Lean angle and shimmer speed reference, plus a flag-angle-to-wind-speed estimator you can dial in by eye.

Flora movement chart

No instruments, no problem — leaves, twigs, branches, and trees, in a Beaufort-style reference for reading wind speed from vegetation.

Density altitude, live

Set HOME and CURRENT conditions and see ΔDA — and whether today's air calls for a fresh DOPE.

Gust Bracket & TOF

Bracket the gusts.
Not just the average.

Wind doesn't hold still. Set a gust minimum and maximum, load your bullet's real ballistic profile, and Ventux shows you the full picture — not a single number pretending to be certain.

Nominal, low, high

See the full crosswind bracket in one glance — plus the group-size spread that bracket costs you downrange.

True time-of-flight weighting

Not linear distance-based guessing — real weighting from your bullet's actual time-of-flight near each station.

LAG, in mil and MOA

The angular hold derived from your bullet's ballistic lag — dialed in from your own load profile.

One number.
Every wind.

A field crosswind calculator for long-range & precision rifle shooting.