Calculator
Rate accuracy and repeatable garden results
Garden oils are often dosed with kitchen spoons, yet labels may specify grams or ounces. A small mismatch compounds in larger tanks. For a 3.785 L gallon batch, a 10 mL mistake equals about two teaspoons, which can change coverage, phytotoxicity risk, and how well an emulsion holds. For sensitive foliage, staying within recommended rates improves burn prevention, keeps beneficial insects safer, and limits residue that attracts dust during hot afternoons too. Converting before mixing keeps programs consistent across operators and seasons.
Volume units supported for practical mixing
The calculator converts mL, liters, teaspoons, tablespoons, fluid ounces, cups, pints, quarts, and gallons using fixed factors. One teaspoon equals 4.9289 mL, one tablespoon equals 14.7868 mL, and one U.S. cup equals 236.588 mL. These constants help scale a 500 mL hand sprayer recipe to a 15 L backpack without rounding errors.
Mass units for weighing viscous oils
When oils pour slowly or temperatures drop, weighing can be faster and more repeatable than reading meniscus lines. The tool converts among grams, kilograms, ounces, and pounds. Using mass is also helpful for inventory control: tracking how many grams are used per batch can forecast reorder timing better than “partial bottles,” especially when containers are refilled or shared.
Density connects volume and weight
Cross‑conversions use density in g/mL, applying grams = milliliters × density and milliliters = grams ÷ density. Typical horticultural and culinary oils commonly fall near 0.85–0.92 g/mL, so 2 tbsp (29.57 mL) weighs roughly 25.1–27.2 g. Selecting an oil type gives a practical estimate; entering a custom density best matches a product datasheet.
Exports for documentation and compliance
After calculation, download a CSV for spreadsheets or a PDF for field binders. Save notes like crop, pest target, batch size, nozzle type, and date. Consistent records improve training, reduce waste, and support audits by showing how conversion choices aligned with label directions. Clear documentation also helps troubleshoot outcomes by comparing batches with the same final dose.
FAQs
1) When do I need density?
Only when converting between a volume unit and a weight unit. Volume-to-volume and weight-to-weight conversions use fixed unit factors and do not require density.
2) Which teaspoon and tablespoon standards are used?
U.S. measures: 1 tsp = 4.9289 mL and 1 tbsp = 14.7868 mL. If you use metric spoons, results may vary slightly.
3) Why does the same volume weigh differently across oils?
Oils have different densities. A lower g/mL oil weighs less than a higher g/mL oil for the same measured volume.
4) How do I get a custom density value?
Check the product technical sheet or safety documentation for density or specific gravity. If provided as specific gravity, it is numerically similar to g/mL near room temperature.
5) Can I convert mixtures with surfactants?
Yes, but the mixture density can differ from pure oil. For best accuracy, use a measured density for the final blend when converting volume and weight.
6) What should I record in the notes?
Crop, target, tank size, rate used, and date. These details make successful batches repeatable and help explain differences in field performance.