Life expectancy calculators are tools designed to estimate how long a person might live based on various factors. These factors often include age, gender, lifestyle choices, and health conditions. By inputting this information, users can receive an approximate age at which they may expect to live, helping them plan for the future. These calculators typically use statistical data and algorithms to generate their estimates. While they can provide useful insights, it's important to remember that they are not definitive predictions. Individual life spans can vary widely due to genetics, environment, and unforeseen circumstances, making these tools more of a guideline than a guarantee.