Term vs Whole Life Insurance Calculator Formula

Understand the math behind the term vs whole life insurance calculator. Each variable explained with a worked example.

Use the Term vs Whole Life Insurance Calculator

Formulas Used

Monthly Savings (Buy Term)

premium_difference = monthly_savings

Total Term Premiums

total_term_cost = term_monthly * total_months

Total Whole Life Premiums

total_whole_cost = whole_monthly * total_months

Invested Savings Value

invested_value = invest_rate > 0 ? monthly_savings * (pow(1 + invest_rate, total_months) - 1) / invest_rate : monthly_savings * total_months

Variables

VariableDescriptionDefault
term_monthlyTerm Life Monthly Premium(USD)40
whole_monthlyWhole Life Monthly Premium(USD)350
term_yearsPolicy Duration(years)20
invest_returnInvestment Return on Savings(%)7
monthly_savingsDerived value= whole_monthly - term_monthlycalculated
invest_rateDerived value= invest_return / 12 / 100calculated
total_monthsDerived value= term_years * 12calculated

How It Works

Buy Term and Invest the Difference

This strategy compares two approaches:

1. Whole life: Higher premiums that build cash value inside the policy 2. Term + invest: Lower premiums, invest the savings in the market

Formula for Invested Savings

FV = Monthly Savings x [(1+r)^n - 1] / r

Where r is the monthly investment return and n is total months.

Considerations

  • Whole life guarantees cash value; investments carry market risk
  • Whole life has tax advantages on cash value growth
  • Term life expires; whole life is permanent

    • Worked Example

    $40/month term vs $350/month whole life over 20 years at 7% return.

    term_monthly = 40whole_monthly = 350term_years = 20invest_return = 7
    1. 01Monthly savings = $350 - $40 = $310
    2. 02Total term premiums = $40 x 240 = $9,600
    3. 03Total whole life premiums = $350 x 240 = $84,000
    4. 04Invested at 7% for 20 years = $310 x [(1.00583)^240 - 1] / 0.00583 = ~$161,400

    Frequently Asked Questions

    Is term or whole life better?

    For most people, term life is more cost-effective. The "buy term and invest the difference" strategy typically produces more wealth over time. Whole life may benefit those in specific estate planning or tax situations.

    What happens when term life expires?

    When your term expires, coverage ends. If you still need insurance, you may be able to renew at a much higher rate or convert to a permanent policy. Many people no longer need coverage by then.

    Does whole life build cash value?

    Yes, but slowly. Whole life premiums are split between insurance cost and cash value. The cash value grows tax-deferred but typically earns 1-4% -- much less than market returns.

    Ready to run the numbers?

    Open Term vs Whole Life Insurance Calculator