Spot Spray Tank Mix Calculator

Herbicide & Pesticide Rates

Free · In‑App Purchases

Label says oz/acre but your tank is 3 gallons? Spot Spray guides you to the exact mix in seconds. Save single- or multi-ingredient recipes. Sync on iPhone, iPad & Mac. Spot Spray converts label percent and acre rates into exact tank amounts in seconds, no guesswork. Built for farm, garden, and do it yourself home pest control. When the mix has to match the label, the math has to be right. FEATURES • Step-by-step guided workflow • Spray Recipes — save, view, and manage mixes • Share & print — export as PDF • iCloud sync — recipes across iPhone, iPad, and Mac • Works offline — no internet required • High-contrast dark interface • Imperial & metric — switch anytime CALCULATES • Acre & hectare rates • % solution — concentration mixes • Any tank size — 1, 2.5, 100 and up gal/L • Single-product or multi-ingredient tank mixes UNITS Imperial: oz, pt, qt, gal, lb Metric: mL, L, g, kg HOW IT WORKS 1. Select Imperial or Metric and your label's unit 2. Choose % Rate or Acre/Hectare Rate 3. Enter the label rate and tank size 4. Tap = for the exact amount to add Save as a recipe, add more products to the same tank mix, or share and print from Spray Recipes. WORKS WITH Herbicides, pesticides, fungicides, fertilizers, adjuvants, surfactants — for farm, pasture, fence lines, food plots, lawn, garden, and home pest control. PRICING 5 free calculations + 5 free recipe saves. Unlock unlimited use — one-time $4.99, no subscription, no ads. IMPORTANT Spot Spray is a calculation tool only. It does not recommend rates, validate labels, or replace professional advice. Always follow the manufacturer's label. You assume all risks.

Ratings & Reviews

  • 5.0
    out of 5
    3 Ratings

Version 3.0 — complete refresh. • Native Mac app (rebuilt from the ground up) • Guided step-by-step mixing • Single- and multi-ingredient recipes • PDF share and print from Spray Recipes

Version 3.0

The developer, William Keene, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Voice Control

      • Larger Text

      • Dark Interface

      • Differentiate Without Color Alone

      • Sufficient Contrast

    Information

    Seller
    • William Keene
    Size
    • 4.2 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • iPad
      Requires iPadOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 William Keene
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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