Term vs Whole Life Insurance Calculator
Compare term and whole life insurance costs and see what the premium difference could grow to if you buy term and invest the difference.
How to use this tool
- Get quotes for comparable term and whole life policies with the same death benefit.
- Enter both annual premiums and the comparison period (usually the term length).
- Set a realistic investment return for the premium difference.
- Compare the invested difference against the whole life policy's projected cash value.
Term life covers you for a set number of years at a low premium; whole life costs far more but lasts for life and builds cash value. This tool runs the classic "buy term and invest the difference" comparison so you can see what the extra premium might grow to if invested instead.
Formula
Premium difference invested as a yearly deposit
Annual difference = max(0, Whole premium − Term premium)
Future value = Annual difference × [ (1 + r)n − 1 ] ÷ r
where r is the annual return and n the number of years. When r = 0 the future value is simply Annual difference × n. This is the future value of an ordinary annuity (end-of-year deposits).
How it works
Whole life insurance bundles a death benefit with a tax-deferred savings component, which is why its premium is typically five to fifteen times that of comparable term coverage. The "buy term and invest the difference" strategy unbundles those two jobs: you buy cheap term for the protection you need during your working years and invest the premium you save.
This calculator models that side investment as a level annual deposit equal to the premium difference, compounded at your chosen rate using the future-value-of-an-annuity formula. The result is a clean apples-to-apples figure: the brokerage balance you might accumulate over the comparison period. It does not subtract investment taxes or the cash value a whole life policy would have built, so compare it against the policy's projected (non-guaranteed) cash value to judge which path leaves you wealthier.
Term still tends to win for pure cost efficiency, but whole life can suit people who want lifelong coverage, forced savings, or estate-planning features. Use this number as one input — alongside your discipline to actually invest the difference and your need for permanent coverage — rather than as the sole deciding factor.
Worked example
$300 term vs $3,000 whole life over 20 years at 6%
- Annual premium difference: $3,000 − $300 = $2,700 invested each year.
- Apply the annuity future-value formula with r = 0.06 and n = 20: 2,700 × [(1.06)20 − 1] / 0.06.
- (1.06)20 ≈ 3.207135, so the bracket ≈ 2.207135 / 0.06 ≈ 36.78585.
- 2,700 × 36.78585 ≈ 99,321.10.
Difference invested grows to: $99,321.10
Future value of a $2,700 annual premium difference
| Years | 0% (just saved) | 4% return | 6% return | 8% return |
|---|---|---|---|---|
| 10 | $27,000.00 | $32,416.49 | $35,588.15 | $39,113.72 |
| 20 | $54,000.00 | $80,400.81 | $99,321.10 | $123,557.30 |
| 30 | $81,000.00 | $151,429.33 | $213,457.10 | $305,864.67 |
Key terms
- Term life insurance
- Coverage for a fixed period (e.g. 10, 20, or 30 years) with no cash value; the cheapest way to buy a large death benefit.
- Whole life insurance
- Permanent coverage that lasts your whole life and accumulates a tax-deferred cash value, at a much higher premium.
- Cash value
- The savings component inside a permanent policy that grows over time and can be borrowed against or surrendered.
- Buy term and invest the difference
- A strategy of buying low-cost term insurance and investing the premium you save versus a whole life policy.
Frequently asked questions
- Is term or whole life better?
- For most families seeking the largest death benefit per dollar, term wins. Whole life makes sense if you want guaranteed lifelong coverage, a forced-savings vehicle, or specific estate-planning benefits — and can afford the much higher premium.
- Does this include the whole life policy's cash value?
- No. It shows what the premium difference could grow to in a separate investment. To complete the comparison, weigh this figure against the policy's projected (non-guaranteed) cash value.
- What return rate should I assume?
- Use a realistic long-run figure for a diversified portfolio — many planners model 5% to 7% after inflation. Lower assumptions narrow the gap between the two approaches.