Calculation history
| Date | Mode | Strength | Final volume |
|---|---|---|---|
| No saved calculations yet. | |||
Calculation formulas
Soap from percentage
Soap = Final volume × (Percentage ÷ 100)Water amount
Water = Final volume − SoapConcentration
Percentage = Soap ÷ Final volume × 100Recipe scaling
New ingredient = Original ingredient × New volume ÷ Original volumeRatio conversion
Percentage = Soap parts ÷ Total parts × 100Rate method
Soap = Rate × Batch volume ÷ Rate basisUsing the calculator
- Select the calculation matching your known information.
- Enter the container, recipe, ratio, or ingredient values.
- Choose plant conditions and review product ingredient warnings.
- Select output units and preferred decimal precision.
- Calculate, then review the mixing and safety instructions.
Use accurate measuring tools for every ingredient. Small errors matter in tiny batches. Patch-testing helps reveal sensitivity before treating larger plant areas.
Editable example recipes
| Example | Finished volume | Example strength | Calculated soap |
|---|---|---|---|
| Small bottle | 500 mL | 0.10% | 0.5 mL |
| One-litre batch | 1 L | 0.25% | 2.5 mL |
| Standard example | 1 L | 0.50% | 5 mL |
| US gallon example | 3.785 L | 0.25% | 9.46 mL |
| Imperial gallon example | 4.546 L | 0.25% | 11.37 mL |
These rows demonstrate calculator mathematics only. They are not universal treatment recommendations. Always follow labels and test plant response carefully.
Common measurement conversions
| Measurement | Millilitre equivalent |
|---|---|
| 1 approximate drop | 0.05 mL |
| 1 teaspoon | 4.9289 mL |
| 1 tablespoon | 14.7868 mL |
| 1 US fluid ounce | 29.5735 mL |
| 1 Imperial fluid ounce | 28.4131 mL |
| 1 US gallon | 3,785.4118 mL |
| 1 Imperial gallon | 4,546.09 mL |
Important garden spray guidance
- Do not use dishwasher detergent on plant foliage.
- Avoid bleach, degreasers, disinfectants, abrasives, and strong fragrances.
- Test one small leaf area before broader application.
- Avoid applying during hot sunlight or plant stress.
- Stop use when spotting, curling, or burning appears.
- Follow labelled pesticide products exactly when using them.
- Keep mixtures away from children, pets, and food.
- Prepare only the amount needed whenever practical.
This calculator performs dilution mathematics and unit conversions. It does not approve pesticide uses. Local guidance and product labels remain your primary references.
Dish soap dilution questions
1. How much dish soap should I add?
The amount depends on batch volume and desired concentration. Enter either percentage, ratio, or rate. The calculator then shows matching soap and water quantities.
2. Can dish soap damage garden plants?
Yes, some mixtures can injure foliage or protective coatings. Sensitive plants may react at low strengths. Patch-test first and observe the treated area carefully.
3. Can I use any dish soap brand?
No product is automatically suitable for every plant. Ingredients vary greatly between brands. Avoid harsh additives and review the complete product label.
4. What differs between soap and detergent?
True soaps and synthetic detergents have different ingredients. Dishwashing products often contain specialised cleaning agents. Their plant effects may therefore differ significantly during use.
5. How are teaspoons converted to millilitres?
The calculator uses 4.9289 millilitres per US teaspoon. Measurement spoons may still vary slightly. A graduated syringe usually improves small-volume measuring accuracy.
6. Should I test before full application?
Yes, apply a small amount to limited foliage. Wait and inspect for visible injury. Wider treatment should follow only after acceptable plant response.
7. Can leftover garden spray be stored?
Storage depends on ingredients and product label directions. Homemade mixtures may separate or change. Prepare smaller batches and discard responsibly when uncertain.
8. When should the spray be applied?
Avoid hot midday sunlight and severely stressed plants. Calm conditions reduce unwanted drift. Follow any timing instructions printed on labelled products.
9. Should plants be rinsed afterward?
Rinsing needs depend on purpose, plant, and product. Prolonged residues may increase foliage stress. Follow labelled directions or trusted horticultural guidance carefully.
10. Can this replace insecticidal soap instructions?
No, labelled insecticidal soap has specific use directions. Those instructions control legal and safe application. Use this calculator only for mathematical checking purposes.
11. How do I scale larger sprayer recipes?
Select the recipe scaling mode and enter both volumes. Add the original soap amount. Every ingredient is multiplied by the same scale factor.