`iRAM = (A /100 )*a + (B/100) * b + (C/100)*c`

Enter a value for all fields

The Isotopes Relative Atomic Mass (RAM) calculator returns the relative mass based on the ratios and masses of multiple isotopes.

INSTRUCTIONS: Choose units and enter the following:

• (R1) Percent Ratio of Isotope 1
• (M1) Atomic Mass of Isotope 1
• (R2) Percent Ratio of Isotope 2
• (M2) Atomic Mass of Isotope 2
• (R3) Percent Ratio of Isotope 3  (Default is zero)
• (M3) Atomic Mass of Isotope 3

Isotope Relative Atomic Mass (iRAM): The calculator returns the mass in atomic units (u).  However, this can be automatically converted to compatible units via the pull-down menu.  NOTE: The three ratios must sum to 100%.

The Math / Science

This equation calculates the Relative Atomic Mass of an Isotope given the mass and %Abundance of the Isotopes. Enter Zero (0) in the last two fields if you do not have a third Isotope.

RAM =  (Abundance x Atomic weight) + (Abundance x Atomic weight) + (Abundance x Atomic weight)

where:

• RAM = Relative Atomic Mass
• Abundance = Ratio of the Isotope
• Atomic Weight = Atomic Weight of Isotope