dilutioncalculator.co.uk§ Verified 20 Jun 2026 · Reviewed by A. Hargreaves, MChem (Hons)
Roundup Fast Action dilution
Manufacturer-recommended dilution of 1:50. Garden Roundup concentrate at 20 ml per 1 L for annual weeds.
§ 1Recommended dilution
General
1:50
Heavy / outbreak
1:25
§ 2Dose by vessel · at 1:50
| Vessel | Concentrate | Water | % v/v |
|---|---|---|---|
| 750 ml trigger spray | 14.7 ml | 735 ml | 1.96 |
| 5 L mop bucket | 98.0 ml | 4 902 ml | 1.96 |
| 10 L bucket | 196.1 ml | 9 804 ml | 1.96 |
| 25 L drum | 490.2 ml | 24 510 ml | 1.96 |
§ 3All recommended ratios in a 5 L bucket
| Ratio | Concentrate (ml) | Water (ml) | % v/v |
|---|---|---|---|
| 1:25 | 192.3 | 4 807.7 | 3.85 |
| 1:50 | 98.0 | 4 902.0 | 1.96 |
| 1:100 | 49.5 | 4 950.5 | 0.99 |
Vessel: mop bucket (5000 ml).
§ 4Standards and claims
- BS EN 1276 · not claimed at general dilution per manufacturer page.
- BS EN 14476 · not claimed at general dilution per manufacturer page.
- Manufacturer page: www.roundup-garden.co.uk[1]
- SDS: www.hse.gov.uk
§ 5Related
Verified 2026-06-20 against manufacturer page and SDS.