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About
Casita · Honest mortgage calculator
Knowing how much a house really costs shouldn't take 30 minutes and a dozen browser tabs. Casita calculates your monthly payment, breaks down the full amortization schedule and compares real loan products — without asking for your email, your phone number or any other personal information.
WHAT YOU CAN DO
· Calculate your monthly principal & interest payment instantly
· See the full amortization table, month by month, with chart
· Compare conventional, FHA, VA and ARM loans side by side
· Estimate closing costs (origination, appraisal, title, escrow, taxes)
· Find out how much home you can afford (28/36 front/back-end DTI rules)
· Decide between buying and renting with the opportunity cost of your down payment baked in
· Estimate rental yield if you'd rent it out
· Project how much you save with extra principal payments
· Check 30-year fixed and ARM rates, updated daily
· Save scenarios locally — no account required
REAL DATA, OFFICIAL SOURCES
Freddie Mac MORTGAGE30US for the benchmark 30-year fixed. Federal Reserve H.15 release for ARM indexes. Lender rates refreshed weekly.
OUR VALUES
· Independent. No bank owns us.
· No mandatory sign-up.
· Mathematically correct — French amortization, APR via Newton-Raphson.
· Honest ads via AdSense, with your consent.
BUILT FOR 6 COUNTRIES
USA · Spain · Mexico · Argentina · Colombia · Chile
Each country with its local currency, terminology and regulation: conventional/FHA/VA in the US, Ley 5/2019 in Spain, Infonavit in Mexico, UVA in Argentina, Mi Casa Ya in Colombia, DS1/DS49 subsidies in Chile.
Built in Madrid, in Fraunces, with care.
casitacalc.com
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What's New in Casita
1.0
April 28, 2026