Herbicide coverage is calculated from three numbers: the treated area, the product’s dilution ratio, and the application rate per unit area — get any one of these wrong and you either run out mid-job or buy several times more product than the job actually requires. Here’s how to work it out before you order.
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The Three Numbers You Need
Number Where to Find It Why It Matters Area to be treated Measure or estimate in square meters, acres, or hectares Determines total spray volume needed Dilution ratio Printed on the product label Determines how far one bottle of concentrate stretches Application rate Printed on the product label How much diluted spray to apply per unit area
A Worked Example
Say you’re treating 1,000 square meters with a product diluted at 1:50 and applied at a rate of 3 liters of diluted spray per 100 square meters. That’s 1,000 ÷ 100 × 3 = 30 liters of diluted spray needed. At a 1:50 dilution, that requires 30 ÷ 51 ≈ 0.6 liters of concentrate (since 1 part concentrate to 50 parts water means each liter of mix uses about 1/51 liters of concentrate).
Pro tip: Always round up your concentrate estimate by 10–15%. Uneven terrain, overlap between spray passes, and windy conditions all increase actual usage beyond the theoretical minimum — running short mid-job costs more time than a slightly oversized order.
Quick Reference: Concentrate Needed by Area
Area Approx. Diluted Spray Needed (at 3L/100m²) Concentrate Needed (at 1:50 dilution) 100 m² 3 L ~60 mL 1,000 m² (0.1 ha) 30 L ~600 mL 1 hectare 300 L ~6 L 5 hectares 1,500 L ~30 L
Learn about Medium’s values
Figures are illustrative based on a 1:50 dilution and 3L/100m² rate — always confirm the exact ratio and rate on your specific product’s label, since these vary by formulation.
Which Bottle Size Actually Makes Sense
For anything under half a hectare, our 10% Glufosinate Ammonium Herbicide in a smaller bottle size covers the job without excess leftover concentrate sitting in storage. For larger fields or multi-season use, our Ammonium Glyphosate 15% in bulk concentrate works out significantly cheaper per treated hectare than buying multiple smaller bottles.
Watch out: Diluted spray mixture doesn’t store well long-term — most labels recommend using a diluted mix within 24 hours. Calculate only what you need for that day’s application rather than pre-mixing a large batch to use across multiple sessions.
Frequently Asked Questions
How do I calculate how much herbicide concentrate I need?
Multiply your treated area by the label’s application rate to get total diluted spray volume, then divide that by the dilution ratio to find the concentrate amount required.
Does terrain affect how much herbicide I need?
Yes, uneven or sloped terrain typically increases actual usage compared to flat ground, due to overlap and runoff, so it’s wise to add a 10–15% buffer to your calculated estimate.
Can I mix more concentrate than I need and store it for later?
Diluted spray mixtures generally don’t store well and are best used within 24 hours, so it’s better to calculate and mix only what a single application requires.
Browse our full herbicide range to find the right concentrate size for your job.
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