Rate Impact Simulator
A 0.25% rate change feels small — until you multiply it by 360 payments. This simulator shows how each tick of the rate dial reshapes your monthly payment, total interest, and affordability. Pre-filled with the latest 30-year fixed rate from Freddie Mac.
Why 0.25% Matters
On a $400,000 loan, each 0.25% rate increase adds roughly $55-65/month. Over 30 years that compounds to $20,000+ in extra interest. Rate changes don't just affect your payment — they shift how much home you can afford.
Rate Locks & Timing
Most lenders offer 30-60 day rate locks. If rates drop before closing, many will let you float down. If rates rise, you're protected. Understanding the dollar impact of each move helps you decide when to lock.
$440,411
20% ($88,082)
6.490%
Not set
Monthly PITI
$2,742
at 6.490% on $352,329 loan
Monthly P&I
$2,225
principal + interest only
Total Paid (30yr)
$1,075,076
PITI + down payment
Total Interest
$448,542
127% of loan
Cost per +0.25%
$58/mo
$20,880 over 30 years
Rate Comparison
Rate Monthly PITI vs. Current
5.490% $2,515 $-226
5.990% $2,627 $-115
6.490% $2,742 —
6.990% $2,859 +$117
7.490% $2,978 +$236