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We analyzed over 500,000 anonymous calculator sessions from January 2025 to December 2025 to understand how Americans use online calculation tools. Key findings include a 340% spike in mortgage calculator usage following Fed rate changes, seasonal patterns in health calculator usage (January peak for BMI), and significant regional differences in calculator preferences between coastal and inland states.
Within 48 hours of each Federal Reserve interest rate announcement, mortgage calculator usage increased by an average of 340%. The highest single-day spike occurred on March 15, 2025, with 12,400 calculations — 5.2x the daily average.
BMI and calorie calculator usage peaks in January, with 2.8x normal volume, correlating with New Year's resolutions. Usage gradually normalizes by mid-February but remains elevated through March.
Coastal states (CA, NY, WA) show disproportionate use of mortgage and investment calculators, while inland states (TX, OH, IN) favor salary calculation and tax estimation tools. Health calculators are uniformly popular across all regions.
Anonymized, aggregated daily usage counts by calculator type, state, and device category.