7/1 ARM calculators? I cant one online

[Danny N.]

Im trying to see the difference between a $500k 4.5% 30 year and a 3.76% 7/1 ARM but cant seem to find a calculator online. Im trying to finance a property coming up and was quoted $2500 or so for the 30 year at 4.5% and was told 3.76% on the 7/1 ARM but no payment number. It's a vacation home thats why the slightly higher rate on the 30 year. Any idea where I can see a calculator for the 7/1 ARM? Curious how much I would save on the payments and if it was worth it.