Calculator / Quick build

Mortgage Calculator

An assumption-first calculator that exposes the full cost of a home loan.

FinanceInteractiveComparison

Preview study

Primary prompt

Copy, customize, then build.

Build an educational mortgage calculator for first-time home buyers. Put the inputs and monthly result in the first viewport.

Inputs: home price, down payment as amount or percentage, loan term, interest rate, annual property tax, annual insurance, and monthly HOA. Output principal and interest, estimated total monthly payment, total interest, and cash needed at closing. Add an amortization chart and table, plus a side-by-side scenario comparison. Clearly label assumptions and explain that results are estimates, not lending offers.

Use a trustworthy but non-bank visual direction with cream, ink, and violet accents. Validate impossible values, support keyboard entry, format numbers without fighting the cursor, and keep the result readable at mobile widths.

Second turn

Useful follow-up commands

Add an extra-payment scenario and show interest and time saved.

Let users share a scenario through URL parameters without storing personal data.

Audit every formula and add a plain-language methodology section.