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

## How to Calculate Neutron to Proton Ratio?

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

Example Problem #1:

- First, determine the total number of neutrons.
- The total number of neutrons is given as: 6.

- Next, determine the total number of protons.
- The total number of protons is provided as: 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

Test your knowledge using the equation and check your answer with the calculator above.

NPR = N / P** = ?**