Sprayer math,
done for you.

Free calculators for orchard growers. No account, no email. Every answer shows how it was worked out, with the extension source behind it, and prints on one sheet for the shop wall.

Airblast nozzle calculator

New

Tell it your speed, row spacing, pressure and the GPA you want. It picks a disc and core for every nozzle position, puts two-thirds of the spray in the top half of the tree, and shows what your set-up really puts out.

You'll need: ground speed · row spacing · pressure · nozzles a side · GPA
Optional: tree height and width, for tree row volume
Open the calculator →
An airblast sprayer from behind, spraying two rows of apple trees

Herbicide boom

Coming

Your tips, pressure and speed in; the strip you cover, the GPA on it and what a tank treats out. With a catch check.

A tractor with a herbicide boom spraying the strips under two tree rows

Calibration check

Coming

Catch each nozzle for the same time and type in what came out. It shows the sprayer's real GPA and flags any tip running 10% over its rated flow, the point where it's worn.

You'll need: a measuring jug, a stopwatch, a hose on each nozzle
A nozzle running into a measuring jug, next to a stopwatch

Label rate to tank

Coming

Turn a label rate in %, ppm or per 100 gallons into what goes in your tank and what lands on an acre, with tree row volume for thinners and growth regulators written on a dilute basis.

You'll need: label rate · tank size · your GPA
A product jug pouring into the open fill lid of a towed sprayer

Tank mix sheet

Coming

List the products and rates for a spray and get a printable mix sheet: amount per tank, number of tanks for the block, and the leftover to plan around.

You'll need: products and rates · tank size · acres · GPA
A towed sprayer with a mix sheet clipped to its tank
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