SprayMaster Sprayer tank mix calculator: product per tank, area per tank and loads per job
Divide tank size by your calibrated application rate to get the area one tank covers, then multiply by the label rate. In SprayMaster's free Tank Mix you type four numbers and read Product per Tank, Covers per Tank, Product for Job and Tanks for Job. You bring the rate from the label; the app only does the arithmetic.
What you get: four inputs, four answers
Most tank mistakes come from mixing up two different rates. The label rate is how much product goes on the land. The application rate is how much finished spray (water plus product) your sprayer puts on the same land. Tank Mix keeps them in separate fields, each with its unit next to it.
| Field | What it is | US units | Metric units |
|---|---|---|---|
| Label Rate + Product Unit + Rate Basis | Product rate, typed exactly as the label prints it | fl oz, pt, qt, gal, oz or lb, Per Acre (or Per 1,000 ft², Per Gallon) | mL, L, g or kg, Per Hectare (or Per 100 m², Per Litre) |
| Application Rate | Spray volume (carrier) your calibrated sprayer applies | GPA: gallons of spray per acre | L/ha: litres of spray per hectare |
| Tank Size | Volume of finished spray in one full tank | gal | L |
| Total Area (optional) | The whole job, after Size a whole job | acre | ha |
Worked example in US units. The label rate of 24 fl oz per acre is made up for this demonstration; it is not a rate for any real product.
| Input or result | Value |
|---|---|
| Label Rate | 24 fl oz, Per Acre |
| Tank Size | 300 gal |
| Application Rate | 15 GPA |
| Total Area | 85 acre |
| Covers per Tank | 20 acre (300 ÷ 15) |
| Product per Tank | 480 fl oz (24 × 20) |
| Product for Job | 2,040 fl oz (24 × 85) |
| Tanks for Job | 4.25 (85 ÷ 20) |
The same arithmetic in metric, with its own made-up numbers: a label rate of 800 mL per hectare, a 1,200 L tank and a sprayer calibrated at 150 L/ha.
| Input or result | Value |
|---|---|
| Label Rate | 800 mL, Per Hectare |
| Tank Size | 1,200 L |
| Application Rate | 150 L/ha |
| Total Area | 30 ha |
| Covers per Tank | 8 ha (1,200 ÷ 150) |
| Product per Tank | 6,400 mL (800 × 8) |
| Product for Job | 24,000 mL (800 × 30) |
| Tanks for Job | 3.75 (30 ÷ 8) |
The answer stays in the unit you picked: a rate in mL gives mL, a rate in pints gives pints. Tanks for Job is not rounded, so 4.25 means four full tanks and a quarter tank that you size yourself.
Free, Pro, and what SprayMaster will not tell you
- Free: Tank Mix with whole-job totals, Mix Ratio for per-gallon or per-litre labels, US and metric units, and Save to History. The free version shows a banner on the home screen and a full-screen ad every third time you open Tank Mix or Mix Ratio.
- Pro (weekly, yearly or a one-time lifetime purchase): Sprayer Calibration to measure your GPA or L/ha, the Rate Converter, Area / Acreage, and no ads.
- No product advice: the app contains no product list, no label rates, no dose recommendations and no tank-mix compatibility or mixing-order checks. It never tells you what to spray or how much the label allows.
- No unit conversion inside Tank Mix, no active-ingredient maths, no adjuvant or water-conditioner handling, and no plan for rinse water or the partial last tank.
- History stays on the phone: no export, sharing or printing of records.
Why bother with the app instead of a pencil and a scrap of paper? At the tank, with gloves on, it keeps product rate and spray volume apart, puts the unit next to every number, and gives the whole job in one screen. Covers per Tank is more reliable than a mental calculation at the tank, where it's easy to get it wrong. No signal needed.
How to calculate a tank mix in SprayMaster
- Open Tank Mix in the Calculators section.
- Pick Units: US for gallons and acres, Metric for litres and hectares.
- Type the Label Rate, choose the Product Unit printed on the label and set Rate Basis to Per Acre (Per Hectare in metric).
- Under Your Sprayer, type Tank Size and your measured Application Rate.
- Read Product per Tank and Covers per Tank in Mix.
- For the whole field, turn on Size a whole job under Job (optional) and type Total Area to get Product for Job and Tanks for Job.
- Tap Save to keep the result with date and time in History.
Why the application rate has to be measured
In the US example, suppose you type 15 GPA but the sprayer really puts out 18 GPA. A 300 gal tank then covers about 16.67 acres, not 20, and the 480 fl oz in it lands at 28.8 fl oz per acre instead of 24. The formula is right; the input was wrong. Pro's Sprayer Calibration works out the real GPA or L/ha from nozzle output, speed and spacing, or from a catch test.
Common mistakes at the tank
- Typing the label rate into Application Rate, or the spray volume into Label Rate. One is product, the other is water plus product.
- Using the GPA from the sprayer manual instead of the one you measured with your nozzles, pressure and speed.
- Choosing Per Acre for a label that states the rate Per Gallon of spray, or per 1,000 ft².
- Rounding Tanks for Job in your head and running short on the last load.
Questions and answers
How do I work out how much product goes in my sprayer tank?
Is the tank mix calculator free?
Does SprayMaster tell me which product or rate to use, or whether two products can be mixed?
Why does Tanks for Job show 4.25 instead of 5?
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- How to figure out how many acres a field is, including a center pivot · SprayMaster
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- How to figure out how many acres a field is, including a center pivot
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