There are two main factors that go into calculating your SBI Rinn Raksha premium - the sum assured, and the policy term.
The sum assured is the amount of coverage you choose, and will be paid out to your beneficiaries in the event of your death. The policy term is the length of time for which the policy will remain in force.
To get an accurate estimate of your premium, you can use SBI's online calculator, which takes both of these factors into account.