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Free real estate calculators — cap rate, mortgage, cash-on-cash, DSCR, rent vs. buy, 1% rule — built on investor-grade formulas and transparent public data sources. No subscription, no signup, no lead gen. Just the same math commercial lenders underwrite to, running live in your browser.
One Tool, Every Number You Need Before You Offer

1.Free Calculators, Unlimited Use — Cap rate, mortgage, cash-on-cash, DSCR, rent vs. buy, 1% rule. Every calculator runs live as you type. No “Calculate” button, no email gate.
2.Investor-Grade Formulas — The same NOI, cap rate, DSCR, and cash-on-cash math commercial lenders underwrite to — not simplified consumer-grade approximations.
3.Real Data, Not Vibes — Live FRED MORTGAGE30US for rates, BLS CUUR0000SEHA for housing CPI, Census B25064 for local rent baselines. Every source listed with refresh frequency and public URL.
4.Fully Transparent Methodology — Every formula, data source, and default value is published on a dedicated methodology page. No black-box assumptions.
5.No Lead Gen, No Lender Partnerships — The mortgage rate you see is the FRED Freddie Mac weekly survey, not a lender bid. No contacts to sell, no upsells to push.