There is no one glove fits all solution when it comes to how much life insurance each person needs. However, the generally acceptable strategy to assess your insurance cover is to get 10 to 18 times your annual income; depending on what age you subscribe to an insurance policy.
The amount of insurance cover you need depends on how many people are exposed to a financial risk which may arise due to death or some kind of contingency. The cover should be such that the dependents should be able to at least survive in your absence to a satisfactory level until such time they are self-reliant.