Methodology

Cost of Living Index

Our Cost of Living Index uses a weighted composite of local real estate market data, median rents, and non-housing price parities compared to the national baseline. Weightings emulate the Bureau of Labor Statistics (BLS) Consumer Expenditure Surveys (CEX) models.

Overall Index = (Housing × 0.35) + (Rent × 0.15) + (Goods × 0.20) + (Services × 0.20) + (Utilities × 0.10)
Data Origins & Baselines:
Housing Index (35%): Based on Zillow Home Value Index (ZHVI). Fallback to Census ACS.
Rent Index (15%): Based on Zillow Observed Rent Index (ZORI). Fallback to Census ACS.
Goods Index (20%): Based on BEA Metropolitan Area Regional Price Parities (MARPP) for goods/groceries.
Services Index (20%): Based on BEA MARPP for healthcare, transportation, and other services.
Utilities Index (10%): Based on BEA MARPP for local energy/water utility parities.

A composite score of 100 represents the national baseline used by this model. Below 100 indicates lower estimated local costs; above 100 indicates higher estimated local costs.

< 75 = Very Affordable (Exceptional Purchasing Power)
75–89 = Affordable
90–109 = Average (Near National Median)
110–129 = Expensive
≥ 130 = Very Expensive (Low Purchasing Power)

Mortgage Calculator

Our mortgage calculator uses the standard amortization formula:

M = P × [r(1+r)^n] / [(1+r)^n – 1]
Where:
P = Principal (home price - down payment)
r = Monthly interest rate (annual rate / 12)
n = Total payments (loan term in years × 12)

The total monthly payment adds: principal & interest, property tax (annual tax / 12), home insurance, PMI (if down payment < 20%), and HOA fees.

When accessed from a city page, the calculator is pre-filled with the local median home value and the state's effective property tax rate from the Tax Foundation.

Tax Context

LivabilityCalc uses state-level tax context to help explain housing and relocation costs. The goal is to show how tax structure changes household budget pressure across places, alongside rent, property tax, utilities, and mortgage assumptions.

Place Tax Context = Property Tax Rate + Sales Tax Context + State Income Tax Overview

Property Tax: State-level effective rates are used as a planning proxy, not parcel-, county-, school-district-, or special-assessment-level tax bills.
Sales Tax: State plus average local sales tax context is shown where available to explain place-level consumer-cost pressure.
Income Tax: State income tax is used to estimate how much budget room may change from one place to another under the same gross income assumption.

Household Budget Context

LivabilityCalc uses local household income as a benchmark for housing burden and home-price-to-income context. It helps show what typical budget pressure looks like in a place before you layer in your own household assumptions.

Rent Burden = Typical Monthly Rent × 12 / Local Median Household Income
Home Price to Income = Typical Home Value / Local Median Household Income

Use this section to frame household budget pressure, compare local affordability, and judge how much room a move may leave after housing costs.

Data Freshness & Auditing

Our infrastructure employs a multi-tiered fallback architecture to prevent top-coding data distortions: Zillow ZHVI/ZORI (Monthly Series) serves as the primary real-estate tier, with Census ACS 5-Year Estimates acting as a low-population fail-safe. Non-housing pricing relies exclusively on 2023–2024 BEA MARPP economic data. Mortgage rates reference the weekly FRED 30-Year PMMS Average.

Last multi-database sync: March 2026

Limitations & Statistical Anomalies

Cities lacking Zillow coverage AND with a Census Median Home Value >$2,000,001 are designated as `acs_capped`. Due to Census top-coding constraints, these figures represent structural floors rather than exact medians.
Cities outside recognized Metropolitan Statistical Areas (MSAs) default to robust BEA State-level Nonmetropolitan baseline indices for non-housing parities.
Property taxation matrices compute using state-level effective rates via the Tax Foundation. Specific intra-county taxing districts or special assessment allocations are excluded.
All predictive cost analyses function as systemic estimates. For individual financial transitions, consult a Certified Financial Planner (CFP).