Enter your garden and product details
Sample scenarios
| Scenario | Area | Coverage rate | Coats | Overlap | Mixed solution | Concentrate |
|---|---|---|---|---|---|---|
| Backyard lawn | 2,000 sq ft | 800 sq ft/gal | 1 | 10% | 2.75 gal | 2.8 fl oz (1 fl oz/gal) |
| Patio edges + shrubs | 900 sq ft | 600 sq ft/gal | 1 | 15% | 1.73 gal | 3.5 fl oz (2 fl oz/gal) |
| Small garden path (metric) | 120 sq m | 25 sq m/L | 2 | 10% | 10.56 L | 105.6 mL (10 mL/L) |
How the calculator computes your spray plan
If using percent: Concentrate volume = Mixed volume × (Percent ÷ 100).
Steps for reliable coverage planning
- Pick your unit system and area input method.
- Enter gross area, then subtract any excluded zones.
- Use the product label to set the coverage rate.
- Choose coats and add overlap for real-world waste.
- Set mixing details from the label (per-unit is common).
- Optional: add tank capacity to plan refills and batches.
- Download CSV or PDF to save your results.
Coverage rate matters
Coverage rate converts treated area into mixed solution volume. Labels often show a range because droplet size, nozzle fan width, and walking speed change deposition. For shrub lines and dense foliage, use the lower end to avoid under-application. For open lawn, the higher end may be realistic. Field-check by spraying a measured test patch and comparing tank drawdown to expected gallons or liters.
Planning net treated area
Accurate net area improves cost and safety. Start with gross dimensions or a mapped total, then subtract exclusion zones such as ponds, edible beds, patios, play areas, and water features. The calculator applies exclusions before coats and overlap, so you model “spray-only” footprints. If your yard has multiple shapes, total them and enter one combined area for repeatable treatments. Record date, weather, and rate used so the next session stays consistent across seasons and equipment changes.
Coats and overlap factor
Coats represent repeated passes in the same session. Two coats doubles solution demand, while overlap adds margin for real-world waste. Overlap captures edge re-sprays, wind drift, and missed corners near fences or under benches. A typical planning value is 10–15%. If you spray tall hedges, overlap can be higher, but keep totals within label limits.
Dilution and concentrate budgeting
Most concentrates use a per-unit mix ratio, like fluid ounces per gallon or milliliters per liter. The calculator converts mixed volume into concentrate needed and shows water to add. With bottle size and price, it estimates bottle count and concentrate cost. For percent solutions, it computes concentrate volume as a fraction of the final mixture, useful for some larvicide or fogging products.
Batching and time estimates
Tank capacity estimates refills and the final partial batch. When you enter flow rate, the tool estimates spray time by dividing mixed volume by output. Treat this as planning guidance, because pausing, pumping, and repositioning add minutes. Pair batching with a checklist: pre-measure concentrate per tank, label the mixing jug, and rinse equipment after application.
FAQs
What numbers should come from the product label?
Use the label’s coverage rate and the exact dilution instruction. Enter any stated area-per-volume value and the concentrate-per-unit amount or percent. If the label gives a range, start with the conservative option.
When should I choose percent mixing?
Choose percent only when the label explicitly specifies a percent solution, such as 0.5% or 1%. Most homeowner concentrates use per-gallon or per-liter directions, which usually gives clearer, safer measurements.
How do I pick a realistic overlap percentage?
Start at 10% for open lawn and simple edges. Increase to 15–25% for fences, dense shrubs, or windy conditions. If overlap pushes totals beyond label limits, reduce overlap and improve technique instead.
How does batching work with tank capacity?
Enter your sprayer’s tank size to estimate the number of full refills and the final partial batch. This helps you pre-measure concentrate per tank and avoid guessing mid-job.
Why does the calculator show less water than expected?
If you mix by percent, concentrate volume is part of the final solution, so water is mixed volume minus concentrate. With per-unit ratios, water is the remaining portion after adding measured concentrate.
Can I use this for foggers or mist blowers?
Yes for planning volume, as long as you know the effective coverage rate and output rate. Foggers often have different deposition and drift, so use conservative coverage values and follow equipment and label guidance closely.