This app is a helpful tool, especially for R&D and QC departments for lab calculations and HPLC calculations.
HPLC Calculator new update with friendly user interface and the below calculation capabilities
1-     Void volume
2-     Void time
3-     K prime
4-     Theoretical plates
5-     Resolution
6-     Average, STD and %RSD
7-     Linearity and Calibration (r_squared, Y_intercept, Standard Error, Slope, LOD, LOQ, equation, Unknown concentration)
8-     General Molarity calculations
9-     Calculate how to prepare different Normality from (HCl, H2So4, Glacial acetic acid, Nitric acid, phosphoric acid)
10-  Buffer preparations for phosphate pH 6.8 and Acetate pH 4.5
11-  Assay calculations for test samples (on dried and as is bases)
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/