Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Biology
PCR Primer Tm Calculator
Calculates the melting temperature (Tm) of short PCR primers using the Wallace rule base-counting method. Use it when designing primers under 20 bases or for a quick sanity check before ordering oligos.
Fill in the required fields to see your result.
Biology
Cell Density Calculator
Estimate cell concentration in cells/mL from a haemocytometer count using cellCount, the number of squares counted, and the dilution factor. Returns cells per millilitre.
Fill in the required fields to see your result.
Key differences
| PCR Primer Tm Calculator | Cell Density Calculator | |
|---|---|---|
| Category | Biology | Biology |
| Inputs required | 4 | 3 |
| Result | Melting Temperature (°C) | Cell Density (cells/ml) |
| What it does | Calculates the melting temperature (Tm) of short PCR primers using the Wallace rule base-counting method. Use it when designing primers under 20 bases or for a quick sanity check before ordering oligos. | Estimate cell concentration in cells/mL from a haemocytometer count using cellCount, the number of squares counted, and the dilution factor. Returns cells per millilitre. |