Roundup Mix Ratio Calculator
Work out exactly how much Roundup concentrate to mix for your sprayer. Enter your treatment area and target weed type to get product amount in fl oz and tablespoons per gallon.
Treatment Area & Weed Type
Enter your area size and target weed difficulty to calculate your mix
Total surface area you plan to spray.
1 gallon of mixed solution typically covers about 300 sq ft when spraying to thoroughly wet the target.
Rates per the Roundup Weed & Grass Killer Concentrate product label. Roundup Pro Concentrate and other professional products use different, higher-strength rates.
Fluid ounces of Roundup concentrate per gallon of water. Consumer label range is typically 3–6 fl oz per gallon.
Mix Ratio Results
Product and water needed for your tank
Enter your treatment area and weed type above, then click Calculate Mix Ratio to see how much Roundup concentrate and water you need.
Roundup Label Rates
Common dilution rates from Roundup consumer product labels. Always confirm against your current label for your specific product and target weed.
| Weed Type | Rate per Gallon | Tablespoons | Coverage |
|---|---|---|---|
| Easy annual weeds (under 3in) | 3 fl oz | 6 Tbs | ~300 sq ft / gal |
| Tough perennials, brush, vines | 6 fl oz | 12 Tbs | ~300 sq ft / gal |
| Lawn renovation | 6 fl oz | 12 Tbs | ~300 sq ft / gal |
| Roundup for Lawns | 2.66 fl oz | ~5.3 Tbs | ~500 sq ft / gal |
| Roundup Pro Concentrate | 0.5–10.5 fl oz | Varies | Per label, Table 6.3 |
Roundup Mix Ratio FAQ
Everything you need to know about mixing and applying Roundup weed killer concentrate.
For Roundup Weed & Grass Killer Concentrate, the label calls for 3 fluid ounces (6 tablespoons) per gallon of water for easy-to-kill annual weeds, and 6 fluid ounces (12 tablespoons) per gallon for tougher perennials, brush, vines, or lawn renovation. Always check the specific product label, as formulations and concentrations vary.
One gallon of mixed spray solution typically covers about 300 square feet (roughly a 30 by 10 foot area) when spraying to thoroughly wet the target weeds or grass.
1 fluid ounce equals 2 tablespoons. So a 3 fluid ounce rate is the same as 6 tablespoons, and a 6 fluid ounce rate is the same as 12 tablespoons, both measured per gallon of water.
Yes. Roundup Pro Concentrate is a higher-strength professional product (around 50.2% glyphosate) with a much wider label rate range, typically 0.5 to 10.5 fluid ounces per gallon of water depending on the target weed and desired solution strength. Always refer to the specific product’s label rather than assuming consumer product rates apply.
Depending on the specific product, you can typically plant again anywhere from 1 to 30 days after application. Check your product’s label booklet for exact replanting timeframes, since this varies by formulation.
Many Roundup concentrate products become rainproof in as little as 30 minutes after application, meaning rain or watering after that point will not wash away effectiveness. Always confirm the rainfast time on your specific product label.
Product labels commonly require waiting a minimum of 28 days before repeating an application to the same area. Some established perennial or hard-to-kill weeds may need a repeat application after this waiting period.
Use a plastic, fiberglass, plastic-lined steel, or stainless steel sprayer. Do not mix, store, or apply Roundup products in galvanized or unlined steel containers or tanks, as the product label specifically warns against this.