Dilution and tank-mix math, right at the truck.
Volume rate, area rate, and percent-concentration calculators built for the field — no signal required, no login screen between you and the number you need. Add Pro when you're ready for compliance recordkeeping.
Works with zero signal in a crawlspace. No account, no signup, no data leaves your phone on the free tier.
Three calculators. No ads getting in the way of the math.
Every free calculator works fully offline. You enter your product's own label rate — PCOcalc only ever does the arithmetic, never a recommendation.
Volume rate
Oz of product per gallon of water — the everyday mixing calculation, done instantly as you type.
Area rate
Oz per 1,000 sq ft, with an optional carrier-water field to see the equivalent mix strength too.
% concentration
Standard C1V1=C2V2 dilution math, adjusted for your product's own active-ingredient percentage.
Plus a unit converter and 5 saved calculations, free
Convert oz/gal/L/acre/sq ft/mL/m²/ha in either direction, and keep your five most-used calculations one tap away — no account needed for any of it.
Get PCOcalc
Free on the App Store and Google Play. Pro unlocks compliance recordkeeping — see what's included.
Store listings go live ahead of the December 1, 2026 launch.
Running a crew, not just yourself?
PCOcalc for Teams syncs every tech's compliance log into one shared record the owner can see and export.
See PCOcalc for Teams