Calculator
Enter limits and risk details. Then press Calculate Premium. Results appear above this form.
Example data table
Use this sample to test quickly. Values are illustrative.
| Scenario | Dwelling | Loss of Rent | Liability | Deductible | Hazard | Claims | Est. Annual Premium |
|---|---|---|---|---|---|---|---|
| Baseline | $220,000 | $24,000 | $300,000 | $1,000 | Medium | 0 | Varies by factors and options |
| Higher deductible | $220,000 | $24,000 | $300,000 | $5,000 | Medium | 0 | Usually lower than baseline |
| High hazard / prior claims | $220,000 | $24,000 | $500,000 | $1,000 | High | 2 | Usually higher than baseline |
Formula used
This calculator uses a common rating structure: coverage-based base premium times a multiplicative risk factor, plus endorsements, minus discounts, then taxes and fees.
RatedBase = BasePremium × (Π Factors) × InflationGuard
Subtotal = RatedBase + D + E + F + AddOns
AfterDiscount = Subtotal × (1 − Discount%)
AnnualTotal = AfterDiscount + Taxes + Fees
- BaseRate is an illustrative per-$1,000 rate for A/B/C.
- Discounts are capped to prevent unrealistic reductions.
- Monthly billing adds an installment estimate, if selected.
- Replace parameters with your filed rates when deploying.
How to use
- Enter your dwelling limit, other structures, and landlord property.
- Choose loss of rent, liability, medical payments, and deductible.
- Select risk details: occupancy, construction, hazard, distances, and history.
- Enable endorsements and discounts that match your property.
- Press Calculate Premium and review the breakdown and chart.
- Download CSV for spreadsheets or PDF for sharing.
Premium drivers and coverage structure
This calculator estimates annual premium by combining coverage limits with pricing factors. Dwelling (A), other structures (B), and landlord property (C) form the rated base, using a per‑$1,000 base rate. Loss of rent (D) adds a charge tied to annual rent coverage. Liability (E) and medical payments (F) price by limit units. Endorsements add flat or per‑$1,000 loads for planning.
Interpreting risk inputs and multipliers
Risk multipliers adjust the rated base to reflect expected frequency and severity. Occupancy separates long‑term tenants from student, short‑term, or vacant exposures, where turnover and supervision differ. Construction influences fire spread and wind performance. Hydrant and station distance proxy response time and water supply. Hazard level summarizes wind, hail, wildfire, and neighborhood loss trends. State factor and inflation guard model pricing trends.
Deductibles, claims, and roof effects
Deductibles influence premium through a capped factor: higher deductibles generally reduce cost, while very low deductibles can increase it. Prior claims raise premium because repeat losses correlate with maintenance gaps. Roof age is weighted because storm losses are roof‑driven; older roofs typically increase the factor. Building age also contributes, reflecting plumbing, wiring, and code differences. Use the five‑year claims count to test underwriting sensitivity.
Discounts, taxes, and policy fees
Mitigation selections reduce premium, but total discounts are capped at 15% to avoid overstating savings. After discounts, taxes and surcharges apply as a percentage of premium, using your input rate. Fixed items such as a policy fee and optional inspection fee are added last. If monthly billing is selected, the calculator applies an installment estimate of 4% for budgeting. These mechanics help separate technical premium from billing effects.
Scenario testing for renewal planning
Use scenario testing to support renewal decisions. Compare a higher deductible against the annual total and retained risk. Adjust liability limits to match contracts or portfolio size. Toggle endorsements such as water backup and ordinance coverage to evaluate gaps. Change hazard level or roof age to see impact. Export CSV to keep an audit trail, then generate a PDF summary for owners, managers, or lenders reviewing insurance spend.
FAQs
It provides an illustrative premium estimate based on your limits, risk factors, discounts, taxes, and fees. It helps compare scenarios, but it is not an insurance quote or underwriting decision.
Premium rating typically follows rebuild cost coverage limits, not market price. The dwelling limit drives the rated base, while market value is context for checking whether the limit seems reasonable.
Higher deductibles reduce premium through a bounded factor because you retain more loss cost. Very low deductibles can increase premium. Always choose a deductible you can comfortably pay after a claim.
Vacant or short‑term occupancy, severe hazard level, older roofs, multiple recent claims, and low deductibles commonly raise the factor. Higher liability limits and add‑ons increase premium, but usually less dramatically.
Selected safety and management items reduce the subtotal, capped at 15% in this model. The cap prevents unrealistic results when many boxes are checked, keeping comparisons conservative and consistent.
CSV downloads the inputs and outputs for spreadsheet analysis. PDF captures the results block, including the breakdown table and Plotly chart, making it easy to share a scenario with clients or stakeholders.