Comprehensive Guide
Learn more in our Insurance Guide.
How it works
insurance replacement cost estimator takes your inputs and produces dwelling replacement cost, personal property coverage needed, coverage gap (or surplus), gap as % of needed coverage. Estimate the true replacement cost of your home and belongings for proper insurance coverage. You provide 5 inputs: Home square footage (number) (default: 2000); Local rebuild cost per sq ft (currency, in dollars) (default: 175 dollars); Personal property value (currency, in dollars) (default: 50000 dollars); Current dwelling coverage (currency, in dollars) (default: 300000 dollars); Personal property coverage (% of dwelling) (percent, in percent) (default: 50 percent). The calculator returns 4 outputs: Dwelling replacement cost (the primary result); Personal property coverage needed (a secondary output); Coverage gap (or surplus) (a secondary output); Gap as % of needed coverage (a supplementary figure). Insurance is the mathematics of rare but catastrophic events. The right coverage amount depends on your assets, income, dependents, and risk tolerance — not on rules of thumb. This tool computes the actual figures so you can compare premiums against the expected value of protection. The underlying formula: Dwelling replacement = Sq ft × Cost per sq ft | Gap = Needed coverage − Current coverage With the default values, dwelling replacement cost is computed from the interaction of every input field — change any one of them and the result updates immediately, so you can stress-test different scenarios without re-entering the whole form. Adjust the inputs to match your real financial situation. The defaults are realistic starting points, but every person's circumstances differ — your actual income, expenses, rates, and timelines will produce a different answer. Use the tool iteratively: start with the defaults, then change one variable at a time to see which factor has the largest impact on your outcome.Formula
Dwelling replacement = Sq ft × Cost per sq ft | Gap = Needed coverage − Current coverage
Tips
- Market value ≠ replacement cost. Land is included in market value but does not need insurance.
- Check local rebuild costs with contractors — they vary widely by region.
- Underinsurance is the #1 homeowner insurance mistake.
- Review replacement cost annually — construction costs rise 3–5% per year.
Frequently asked questions
How much home insurance do I need?
Enough to fully rebuild your home at current construction costs. Use replacement cost (square footage × rebuild cost per sq ft), not market value. Most homes need 20–50% more coverage than they have.
What is the difference between market value and replacement cost?
Market value = what the home sells for (includes land). Replacement cost = what it costs to rebuild (excludes land). A $400K home on $150K land needs only $250K in dwelling coverage.
How accurate are the calculator results?
The math is exact — the same formulas a financial professional would use by hand. The precision of the output depends entirely on how realistic your inputs are. Use your actual numbers rather than estimates when possible. The defaults are reasonable starting points, but your real income, rates, and timeline will produce a different result.