BillsBae mortgage brain
Free online mortgage calculator
Mortgage calculator for people who still want a life—compare monthly cost, closing cash, savings rate, approval posture, and rate/price/down-payment scenarios in one workspace.
Mortgage inputs
Tune the truth.
Save scenario
Heavyapproval lens
$2,420/mo
Housing payment before everyday spending and debt
Housing payment before everyday spending and debt
This home crowds out the savings target. Treat it like a stretch.
Savings rate6%
DTI51%
One-time closing cash$82,085
Monthly derivation
How the monthly number is built.
Mortgage math
$300,000 loan over 30 years at 6.75%.
Housing stack
Recurring housing costs added to principal and interest.
Monthly cash flow
What remains after housing, everyday spending, and debt.
What-if scenarios
Cost versus breathing room.
What-if scenarios
Cost versus breathing room.
Current assumptions for price, rate, down payment, and spending.
Stress test the monthly payment if rates move against you.
A calmer offer target that protects cash flow.
A premium listing scenario with the same down-payment ratio.
See how additional cash changes PMI, loan size, and approval.
Saved scenarios