Mortgage Recast Calculator
In the workshopLump sum planner for your loan
Store name: “Mortgage Recast Calculator”
Coming soon
Not out yet — but it’s close.
Recast is the calculator for one specific, expensive decision: you have a lump sum — a bonus, home-sale proceeds, an inheritance — and a mortgage.
- 254 original, FAA-cited practice questions
- All 12 ACS General subject areas
- Timed 60-question exam simulator, 42 to pass
- 100% offline · no ads · no account · one-time $6.99
Free web tool
How does a mortgage recast lower your monthly payment?
A mortgage recast re-amortizes your loan after a large lump-sum payment toward principal: the servicer keeps your existing interest rate and remaining term but recalculates the monthly payment on the new, lower balance — so a $50,000 lump on a $300,000 balance at 6% over 30 years drops the payment from about $1,799 to $1,499 (roughly $300/month less). Recasting only lowers the payment; it doesn't shorten the term. Prepaying the same lump while keeping your old payment instead leaves the payment unchanged but pays the loan off years sooner and saves more total interest — the lower-monthly-cost vs. lowest-total-cost trade-off. Most servicers charge a small flat fee (often $150–$500) to recast, and it usually breaks even within a month or two of the lower payment.
Your loan today
The lump sum
Recasting lowers your payment
$299.77/ month
The $250.00 fee pays for itself in 1 month.
Keep paying
$1,798.65/mo
Paid off in 30 yr
$347,515 total interest
Recast
$1,498.88/mo
Paid off in 30 yr
$289,593 total interest
$299.77/mo lower payment
Prepay (keep payment)
$1,798.65/mo
Paid off in 19 yr 11 mo
$178,186 total interest
Paid off 10 yr 1 mo sooner
Same $50,000.00 lump, two very different goals. Recast re-amortizes the new $250,000 balance over your remaining 30 yr to cut the monthly payment by $299.77. Prepay keeps the old payment, so the loan clears 10 yr 1 mo sooner and saves $111,408 more interest than recasting — lower monthly cost vs. lowest total cost.
Estimate only. Not every servicer offers recasting, and those that do set their own minimum lump sum, fee (typically $150–$500), and eligibility rules (FHA, VA and most jumbo loans usually can't recast). Figures are principal & interest only — they exclude property tax, insurance, HOA, PMI and escrow. Confirm the specifics with your loan servicer before deciding.
Take it with you
The full Recast app names and saves whole scenarios ("Year-end bonus," "Sell the condo"), shows the month-by-month amortization schedule and a balance chart for all three paths side by side, and lets you compare different lump sums and payoff dates — all one-tap and fully offline on your phone.
Coming soon to the App Store
What it is
Recast answers one expensive question: you have a lump sum and a mortgage, so should you recast the loan, prepay principal, or do nothing? Enter your balance, rate, term, and the lump sum and see all three futures side by side, with payment, payoff date, interest saved, and the fee break-even.
Why we built it
'Recast' is an exact search with no quality paid app behind it, because generic mortgage calculators bury or omit re-amortization entirely. The gap was a tool built around that one decision: the three-way comparison, the servicer-fee break-even, and a schedule accurate to the penny, so someone whose servicer just said 'recast' can see the real numbers before paying the fee.
Want one like this?
Mortgage Recast Calculator is one of 92. We can build yours.
Every app on the shelf started as one honest problem, scoped small and built native, end to end. That’s exactly how we approach client work — designed, built and shipped, without the bloat.
