Cash-Out Refinance Calculator — borrowing against a house you own

Every field, the formula behind it, and a worked example.

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Borrowing more against a house you already own: what the new loan becomes, what share of the value that is, and the new instalment.

When to use it

When you need a lump sum — building, a business, a family need — and the house is the largest thing you own.

What the house is worth today (Rs)	Today's honest value. The market report and the plot pages are the place to check, not a hopeful guess.
Loan still outstanding (Rs)	What you still owe on it.
Cash you want (Rs)	The lump sum you are trying to raise.
Bank markup, yearly (%)	The rate on the new, larger loan.
Loan length (years)	The new term.

The new loan is what you still owe plus the cash you want.
That is divided by the house's value to give the share you would owe against it.
The instalment is worked out on the new total. Above 80% the share turns red, because that is roughly where banks stop and where a fall in prices would leave you owing more than the house is worth.

A worked example

At 20% over 15 years the instalment becomes about Rs 4.4 lakh a month. The cash is real, but so is the instalment — for fifteen years.

Using a hopeful value for the house so the percentage looks safer.
Taking cash out for something that does not earn — the markup runs for years afterwards.
Forgetting that the new loan usually restarts the clock, so the early years are mostly markup again.

It does not know whether your bank offers this at all — not every Pakistani bank does.
It ignores processing fees and re-valuation charges.
It cannot tell you whether the thing you want the cash for is worth it. That is the real question.