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We want this to be the most accurate free rental-deal calculator on the web, and feedback is how it gets there. If you found a formula you think is wrong, have a convention you'd define differently, or want a metric or feature added, please tell us.
We read every message and usually write back within a few working days. If you're reporting a calculation issue, including the exact inputs you used (or a copied share link) helps us reproduce it quickly.
A reminder: we can help with how the calculator works and how a metric is defined, but we can't advise on specific deals. For decisions about a particular property or loan, your lender, accountant, attorney, or a licensed real-estate professional is the right source. Nothing we send by email is financial, investment, tax, or legal advice.