Estimate least residue from mass and volume inputs. Check blanks, recovery, and reporting units easily. Use exports, charts, and examples for dependable lab review.
Raw Residue Mass (g) = (Dish + Residue Mass) − Dish Mass
Blank Residue Mass (g) = (Blank Dish + Residue Mass) − Blank Dish Mass
Corrected Residue Mass (g) = Raw Residue Mass − Blank Residue Mass
Residue Percentage (%) = (Corrected Residue Mass ÷ Sample Mass) × 100
Recovery Corrected Mass (g) = Corrected Residue Mass ÷ (Recovery ÷ 100)
Residue Concentration (mg/L) = (Recovery Corrected Mass × 1,000,000 × Dilution Factor) ÷ Aliquot Volume
Margin To Target (%) = Target Maximum Residue − Residue Percentage
| Run | Dish Mass (g) | Sample Mass (g) | Dish + Residue (g) | Blank Dish (g) | Blank + Residue (g) | Aliquot (mL) | Dilution | Recovery (%) |
|---|---|---|---|---|---|---|---|---|
| A | 48.125 | 2.500 | 48.214 | 47.900 | 47.902 | 100 | 1 | 98 |
| B | 50.010 | 3.200 | 50.101 | 49.700 | 49.703 | 250 | 2 | 95 |
| C | 45.880 | 1.750 | 45.924 | 45.200 | 45.201 | 50 | 1.5 | 99 |
Residue testing helps determine how much non-volatile material remains after drying, evaporation, filtration, or ignition. In chemistry work, a smaller corrected residue often suggests cleaner separation, better washing, lower contamination, or improved process control.
Blank correction removes background mass caused by the dish, environment, reagents, or handling. Without that correction, reported residue can be overstated. This is especially important when the measured residue is small and the background contribution is meaningful.
Some procedures require recovery correction because not every analyte or solid fraction is fully retained. Dilution factor is also important when the tested aliquot represents a diluted sample. Applying both adjustments can produce a more useful reportable value.
This calculator combines dish masses, blank values, aliquot volume, dilution factor, recovery, and a target limit. It returns corrected residue mass, residue percentage, mg/L concentration, and a target comparison. The chart and export options make it easier to review and document laboratory runs.
It means the corrected remaining solid after subtracting background blank residue. The calculator focuses on the smallest meaningful residue that can be attributed to the tested sample rather than to handling or equipment.
Blank masses remove background residue from the dish, reagents, dust, or moisture. This correction improves accuracy when the measured residue is small and easily affected by contamination.
Use recovery correction when your method does not capture the full residue amount. It adjusts the measured result upward to reflect expected method performance.
mg/L is useful when residue is reported as concentration from an aliquot volume. The calculator converts corrected mass into a concentration value using volume and dilution data.
The corrected residue is set to zero instead of becoming negative. That prevents a physically meaningless negative residue result in the final report.
Yes. It works for evaporation dishes, drying pans, wash solutions, filtrates, and similar gravimetric residue checks, as long as your units stay consistent.
Enter the process or specification limit used by your lab, product standard, or validation protocol. The calculator compares the measured residue percentage with that limit.
For this page, yes. Keeping all masses in grams makes the formulas consistent and keeps the concentration conversion to mg/L straightforward.
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.