Spray Mixing & Coverage Calculator for Pest Control

Mixing pest control concentrate wrong cuts both ways: too weak and the treatment fails, too strong and you are wasting product, breaking the label, and putting more chemical down than the job needs. The label gives you a rate — fluid ounces of concentrate per gallon of water — and a coverage figure. This tool does the arithmetic from there: total mix for your area, concentrate per tank, and how many refills you are in for.

How to use it

Read three numbers off your product label: the mix rate (fl oz per gallon), the coverage (gallons of finished mix per 1,000 sq ft — 1 is the most common label figure for exterior barrier sprays), and then measure the area you are treating. Enter your sprayer tank size last. The tool assumes you mix full tanks at the label rate and one final partial tank for whatever is left over.

A worked example

A 5,000 sq ft treatment area at 1 gallon per 1,000 sq ft needs 5 gallons of mix. At a label rate of 1 fl oz per gallon, that is 5 fl oz of concentrate in total. With a 2-gallon sprayer: two full tanks at 2 fl oz each, plus a last 1-gallon tank with 1 fl oz. If your label rate is different, the tool scales everything to match it.

This tool only does arithmetic. Your product label is the law — its rate, its protective equipment, and its re-entry times override anything a website calculates. Keep kids and pets off treated areas until sprays have dried, or longer where the label says so. Not sure what you are treating? Identify the pest first.