The following formula is involved in the calculation of cash and marketable securities to total current assets ratios:

Cash & marketable securities to current assets:
where C is a company's cash balance, MS is the value of the company's marketable securities, and TCA is the company's total current assets.

The following references can be used to cite this cash and marketable securities to total current assets calculator:
 Soper, D.S. (2017) "Cash and Marketable Securities to Total Current Assets Calculator (Online Software)", http://www.danielsoper.com/fincalc. 
 Bragg, S. (2012). "Business Ratios and Formulas: A Comprehensive Guide", Hoboken, NJ: John Wiley & Sons. 