Enter the total number of neutrons and the total number of protons into the Neutron to Proton Ratio Calculator. The calculator will evaluate and display the Neutron to Proton Ratio.

## Neutron to Proton Ratio Formula

The following formula is used to calculate the Neutron to Proton Ratio.

NPR = N / P
• Where NPR is the Neutron to Proton Ratio (neutrons:protons)
• N is the total number of neutrons
• P is the total number of protons

To calculate the neutron to proton ratio, simply divide the number of neutrons by the total number of protons.

## How to Calculate Neutron to Proton Ratio?

The following example problems outline how to calculate Neutron to Proton Ratio.

Example Problem #1:

1. First, determine the total number of neutrons.
• The total number of neutrons is given as: 6.
2. Next, determine the total number of protons.
• The total number of protons is provided as: 3.
3. Finally, calculate the Neutron to Proton Ratio using the equation above:

NPR = N / P

The values given above are inserted into the equation below and the solution is calculated:

NPR = 6 / 3 = 2:1 (neutrons:protons)

Example Problem #2:

For this problem, the variables required are provided below:

total number of neutrons = 8

total number of protons = 5