Calculator
Example data table
| Scenario | Water | Target | Product | Needed |
|---|---|---|---|---|
| Pond barrel, by water volume | 15 L | 2 mg/L | Liquid, 100 mg a.i./mL | 0.30 mL |
| Bed irrigation, by area | 250 m² | 1.2 mL/m² | 1.0 L/m² | 300.00 mL |
Formula used
Product needed (mL) = Total a.i. (mg) ÷ Product strength (mg/mL).
For powders: Product needed (g) = Total a.i. (mg) ÷ Strength (mg/g).
Water (L) = Spray volume × Area (or × Area in hectares).
Final concentration (mg/L) = Total a.i. (mg) ÷ Water (L).
How to use this calculator
- Select Mix by water volume for tank concentration targets.
- Select Mix by treated area for label rates per area.
- Pick the product form and enter label strength values.
- Enter water volume or area, plus dose and spray volume.
- Press Calculate mix and review the result card.
- Download CSV or PDF for job notes and records.
Practical mixing notes
- Measure with dedicated tools; avoid kitchen utensils.
- Add product to water, then top up to final volume.
- Agitate well and keep the mix moving while spraying.
- Dispose of rinse water according to the label.
- Keep people and pets away until surfaces dry.
Target pests and timing
Larvicides are used where standing water supports mosquito development, such as barrels, ponds, clogged gutters, and low spots in garden beds. Start inspections weekly and treat as soon as larvae are observed. Many programs focus on 7–14 day cycles. Keep a simple map of water sources and note refill frequency.
Interpreting product strength
Labels may express strength as mg active ingredient per mL, or as percent w/v and percent w/w. This calculator converts % w/v to mg/mL using (% × 10). For liquids listed as % w/w, density is applied because percent is per 100 g product. A density of 1.20 g/mL makes the same percent stronger per mL than 1.00 g/mL. Enter density from the safety data sheet when available.
Mix volume planning
Small containers often need very low product volumes, sometimes below 1 mL. Use a syringe or graduated pipette for accurate measurement and avoid kitchen spoons. Mix into a small premix jar first, then pour into the final container to reduce loss on walls. For treated area work, the spray volume setting estimates total tank water. Adjust spray volume to match nozzle output and walking speed for consistent results.
Coverage, retention, and reapplication
Uniform coverage matters more than high concentration. When applying to soil or irrigation channels, keep runoff minimal and avoid drift to pollinator habitat. If water is continuously flowing, use labeled flow-through or briquette options instead of a short-lived tank mix. Reapply only as permitted by the label interval, and consider organic matter, sunlight, and water turnover because these can shorten persistence.
Recordkeeping and compliance
Documenting what you mixed helps prevent overuse and supports safe storage. Save the calculated product amount, batch size, and treated locations. Record the product name, lot number, and weather conditions, including rainfall within 24 hours. If you track costs, compare cost per treatment across sites to prioritize source reduction. The CSV and PDF downloads create quick job notes you can file with other garden input records.
FAQs
1) Should I mix by water volume or by treated area?
Use water volume when you have a target concentration for a tank or container. Use treated area when the label gives rates like mL/m², L/ha, g/m², or kg/ha.
2) What does mg/L mean in practical terms?
mg/L is milligrams of active ingredient per liter of water. If you know the product’s mg a.i. per mL, the calculator converts that strength into the mL needed to reach the mg/L target.
3) How do I enter a percent strength from the label?
Select % w/v for grams active ingredient per 100 mL. Select % w/w for grams active ingredient per 100 g. The calculator converts these to mg per mL (liquids) or mg per g (powders).
4) Why does liquid density change my result?
When strength is given as % w/w, it is based on product mass. Density connects mass to volume, so the same percent can represent a different mg per mL depending on how heavy the liquid is.
5) My label rate is per 1000 m² or per acre. What should I do?
Convert the rate to one of the supported units. Divide a “per 1000 m²” rate by 1000 to get per m². For per acre, convert to L/ha or mL/m² before calculating.
6) What do the downloads include?
Downloads capture your most recent calculation: method, entered inputs, derived strength, required product amount, mix volume, final concentration, active ingredient delivered, and any cost estimate. Use them as a printable log or spreadsheet record.