Fat Content Calculator Inputs
Use mass values from solvent extraction, gravimetric testing, or a similar laboratory workflow. The calculator supports wet basis and dry basis reporting.
Example Data Table
This sample illustrates a typical gravimetric workflow using corrected mass and moisture adjustment. Your exact laboratory procedure may use different defaults.
| Sample | Sample Mass (g) | Tare Mass (g) | Final Mass (g) | Moisture (%) | Aliquot | Recovery (%) | Purity (%) | Fat % Wet Basis | Fat % Dry Basis |
|---|---|---|---|---|---|---|---|---|---|
| Food Sample A | 5.000 | 48.125 | 48.335 | 6.50 | 1.20 | 97.00 | 99.20 | 5.15 | 5.51 |
| Seed Sample B | 3.500 | 42.810 | 43.102 | 8.20 | 1.00 | 98.50 | 99.50 | 8.43 | 9.18 |
| Dairy Powder C | 2.800 | 40.225 | 40.662 | 3.80 | 1.00 | 99.00 | 100.00 | 15.77 | 16.39 |
Formula Used
1) Extracted Fat Mass
Extracted Fat Mass (g) = Final Flask Mass − Empty Flask Mass
2) Corrected Fat Mass
Corrected Fat Mass = Extracted Fat Mass × Aliquot Factor × Purity Fraction ÷ Recovery Fraction
3) Fat Content on Wet Basis
Fat % (Wet Basis) = Corrected Fat Mass ÷ Sample Mass × 100
4) Fat Content on Dry Basis
Fat % (Dry Basis) = Corrected Fat Mass ÷ [Sample Mass × (1 − Moisture/100)] × 100
These equations are useful for extraction-based chemistry, food analysis, oilseed work, and lipid estimation where measured residue must be corrected for recovery, purity, or aliquot handling.
How to Use This Calculator
- Enter a sample name and the extraction method used in your laboratory.
- Input the sample mass, empty container mass, and final mass after extraction.
- Add moisture percentage to calculate dry basis fat content alongside wet basis fat content.
- Adjust aliquot, recovery, and purity only if your method requires correction factors.
- Click the calculate button to show results, chart output, and export options above the form.
Frequently Asked Questions
1) What does fat content mean here?
It represents the percentage of extractable lipid material in the tested sample. The calculator estimates this from measured residue mass and optional correction factors such as moisture, purity, recovery, and aliquot scaling.
2) Why are wet basis and dry basis both shown?
Wet basis uses the original sample mass. Dry basis removes the effect of moisture. Dry basis is often more useful when comparing samples that contain different amounts of water.
3) When should I use an aliquot factor?
Use it when only a portion of the total extract is weighed. For example, if half the extract was analyzed, the aliquot factor helps scale the measured residue back to the full extract amount.
4) What is recovery percentage?
Recovery percentage reflects extraction efficiency. If your method is known to recover less than the full lipid amount, this value corrects the measured residue upward to estimate total fat more realistically.
5) What is residue purity?
Residue purity accounts for non-fat material that may remain after extraction. If the residue is not fully lipid, the purity factor reduces the apparent fat mass to a more defensible estimate.
6) Can this calculator replace a standard laboratory method?
No. It supports calculations after measurements are collected. You should still follow the required laboratory method, drying conditions, solvent protocol, and reporting standard used in your field.
7) Why does final mass need to exceed tare mass?
The extracted residue adds mass to the container. If the final mass is lower than the tare value, the input data is inconsistent and usually indicates weighing, evaporation, or entry errors.
8) What units should I use?
Enter all mass values in grams for a consistent calculation. The page then reports corrected fat mass in grams, concentration in milligrams per gram, and fat percentage on wet and dry bases.