Herbicide Dose & From a.i. to Product

Labels and recommendations often give the dose as active ingredient (a.i.) per hectare, but you measure out the formulated product. For a solid, product (kg/ha) = a.i. rate (g/ha) ÷ 1000 ÷ (a.i.% ÷ 100). For a liquid, product (L/ha) = a.i. rate (g/ha) ÷ a.i. content (g/L). This tool does both and scales to your area and tank.

The active ingredient is the chemical that actually controls the weed; the product is the bottle or bag you buy, which is the a.i. plus carriers and additives. A 50% WP has 500 g of a.i. per kg; a 480 g/L EC has 480 g of a.i. per litre. You always apply more product than a.i. because of those carriers.

It's how much product to add to each sprayer tank so the whole field gets the right rate. The tool divides the total product by the number of tankfuls needed to cover the field at your spray volume, giving grams (solids) or millilitres (liquids) per tank — the number you actually measure at the pump.

Spray volume (L/ha) depends on the sprayer, nozzles, speed and target. Knapsacks often use 300–500 L/ha; boom sprayers 100–250 L/ha. The volume doesn't change the total product (that's set by the a.i. rate) — it changes the concentration per tank and how many tanks you need. Calibrate your sprayer to know your real volume.

No. The total product for the field is fixed by the active-ingredient rate and the area. A higher spray volume just dilutes the same product in more water and means more tankfuls; a lower volume means fewer, more concentrated tanks. Get the total right first, then mix it evenly across however many tanks you use.

Solids include wettable powders (WP), water-dispersible granules (WG) and soluble granules (SG), rated as % a.i. by weight. Liquids include emulsifiable concentrates (EC), soluble liquids (SL) and suspension concentrates (SC), rated as grams of a.i. per litre. Pick the right mode so the maths matches your label.

Use the label a.i. rate, convert it to product with this tool, calibrate your sprayer so you know the real spray volume and swath, and mix per tank rather than by eye. Under-dosing lets weeds survive and breeds resistance; over-dosing wastes money, can damage the crop and may breach residue limits.

Yes — enter the area in acres, hectares, guntha, bigha or m². The tool converts to hectares internally and gives the product per hectare, per acre, per your chosen unit and the field total, plus the per-tank amount. Always cross-check against the product label.

This tool sizes a single herbicide. For tank mixes, calculate each product's dose separately and check compatibility before combining. Add adjuvants (surfactants, oils) at the label rate per tank or per 100 L. See the Spray & Tank Mix calculator for multi-product mixing.

No — always read and follow the product label and local pesticide regulations. Recommended a.i. rates, approved crops, pre-harvest intervals and safety precautions vary by product and region. Use this tool to plan quantities, then confirm everything against the registered label.