Plan mixes before crews open the drums. Switch units, compare ratios, and export reports instantly. Reduce overruns with clear, job-ready volume totals every time.
| Input | Value | Notes |
|---|---|---|
| Surface area | 250 m2 | Concrete wall treatment zone |
| Coverage | 5 m2 per L | From product data sheet |
| Coats | 2 | Two-pass application |
| Waste factor | 8% | Hose and overspray losses |
| Porosity factor | 5% | Rough substrate pickup |
| Stock -> Target | 20% -> 4% | Strength reduction on-site |
| Working solution total | 113.40 L | ~ 29.96 gal |
| Concentrate needed | 22.68 L | ~ 5.99 gal |
| Water needed | 90.72 L | ~ 23.97 gal |
Coverage numbers vary by substrate texture, temperature, and application method. A published 5 m2/L rating often assumes smooth, sealed surfaces and controlled spray patterns. For rough blockwork or broom-finished slabs, practical coverage can drop 10-25%. Use a small test patch (for example 10 m2) to confirm your real liters per coat before committing to full procurement. Recording these observations in daily logs improves future estimates and supports confident change-order discussions.
Multiple coats are not simply "double the work." Two coats may be specified to improve uniformity, reduce pinholes, or achieve target film build. If the first coat primes pores, the second can spread farther on less absorbent surfaces. When specifications call for two passes, start with the same rate for both coats, then adjust the second coat rate only after field verification.
Waste factor accounts for hose losses, overspray, tray leftovers, and start-stop inefficiency. Typical allowances range from 5% (roller on flat areas) to 15% (spray at height with long hoses). Porosity factor captures extra pickup on thirsty or sandy surfaces and can add another 5-20%. Applying both factors separately helps you explain variance to project controls and reduce end-of-day shortages.
Dilution errors are costly: under-strength mixes may fail performance testing, while over-strength mixes inflate chemical spend. When your stock is 20% and the working mix is 4%, every 100 L of working solution requires 20 L concentrate and 80 L water. That simple relationship supports fast stock checks during delivery and helps supervisors validate batch tickets on site.
Rounding up to drum or jerry-can sizes is a practical procurement step. If the calculated total is 113.4 L and you issue 20 L containers, rounding to 120 L prevents half-used containers and reduces crew downtime. Pair rounding with storage planning: keep sealed concentrate shaded, label mixed batches with date/time, and align ordering with shift plans to limit rework.
It is the total mixed liquid you apply on the surface after dilution. The calculator includes coats, waste, and porosity so you can plan the full on-site batch volume.
Use whichever your product sheet provides. Coverage is area per liter (or per gallon). Application rate is liters per square meter (or gallons per square foot). The tool converts formats internally.
Waste reflects handling losses like overspray and leftover material. Porosity reflects extra absorption by the substrate. Separating them improves transparency and makes it easier to justify adjustments in reports.
It uses a proportional rule: Concentrate = Total x (Target% / Stock%). Water is the remaining volume. This matches common dilution practices when concentrations are stated on data sheets.
Use it when instructions specify mixing by parts (for example 1:4). The calculator divides the total into the same fraction of concentrate and water, which is useful for field batching.
Rounding increases total volume to a convenient container multiple. The calculator keeps the same concentrate fraction, so the working mix strength stays consistent. Always measure accurately when batching to avoid drift.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.