by Mark DNA Copy Number Calculator Calculate the number of DNA or RNA copies in a sample. Nucleic Acid Type ? Select ssDNA, dsDNA, or ssRNA. Double-stranded DNA (dsDNA) Single-stranded DNA (ssDNA) Single-stranded RNA (ssRNA) DNA/RNA Concentration (ng/µL) ? Enter concentration from spectrophotometer (e.g., 50). Template Length (bp) ? Enter the number of base pairs or bases (e.g., 1000). PCR Cycles ? Enter number of PCR cycles (0 for initial copies, e.g., 30). Calculate Reset Enter values, then click “Calculate”. JavaScript is disabled. Please enable it to use the calculator.