If you like having the flexibility of a 30 year mortgage payment, but have the means to pay it off over 15 years, this should help give you an idea of what you'll need to pay.

I'm not considering property taxes or homeowners insurance in the monthly payment. Pretend that is paid separate.

I'm going to use the last average rate that I saw on mortgage new daily's website (6.5%)

Part 1: The payment needed to be done in 15 years

Mortgage Balance	Payment Needed
$800,000	$6,968.86
$775,000	$6,751.08
$750,000	$6,533.31
$725,000	$6,315.53
$700,000	$6,097.75
$675,000	$5,879.97
$650,000	$5,662.20
$625,000	$5,444.42
$600,000	$5,226.64
$575,000	$5,008.87
$550,000	$4,791.09
$525,000	$4,573.31
$500,000	$4,355.54
$475,000	$4,137.76
$450,000	$3,919.98
$425,000	$3,702.21
$400,000	$3,484.43
$375,000	$3,266.65
$350,000	$3,048.88
$325,000	$2,831.10
$300,000	$2,613.32
$275,000	$2,395.55
$250,000	$2,177.77
$225,000	$1,959.99
$200,000	$1,742.21
$175,000	$1,524.44
$150,000	$1,306.66
$125,000	$1,088.88
$100,000	$871.11

Part 2 comparing that to the minimum 30 year

Mortgage	30 yr	15 yr
$800,000	$5,056.54	$6,968.86
$775,000	$4,898.53	$6,751.08
$750,000	$4,740.51	$6,533.31
$725,000	$4,582.49	$6,315.53
$700,000	$4,424.48	$6,097.75
$675,000	$4,266.46	$5,879.97
$650,000	$4,108.44	$5,662.20
$625,000	$3,950.43	$5,444.42
$600,000	$3,792.41	$5,226.64
$575,000	$3,634.39	$5,008.87
$550,000	$3,476.37	$4,791.09
$525,000	$3,318.36	$4,573.31
$500,000	$3,160.34	$4,355.54
$475,000	$3,002.32	$4,137.76
$450,000	$2,844.31	$3,919.98
$425,000	$2,686.29	$3,702.21
$400,000	$2,528.27	$3,484.43
$375,000	$2,370.26	$3,266.65
$350,000	$2,212.24	$3,048.88
$325,000	$2,054.22	$2,831.10
$300,000	$1,896.20	$2,613.32
$275,000	$1,738.19	$2,395.55
$250,000	$1,580.17	$2,177.77
$225,000	$1,422.15	$1,959.99
$200,000	$1,264.14	$1,742.21
$175,000	$1,106.12	$1,524.44
$150,000	$948.10	$1,306.66
$125,000	$790.09	$1,088.88
$100,000	$632.07	$871.11

part 3: comparing the interest saved

remember I'm using the same interest rate for both (6.5%). This is assuming you have a 30 year mortgage, but are paying it off at a 15 year pace.

This is the total interest paid over 30 years and 15 years

Mortgage	30 interest	15 interest
$800,000	$1,020,355	$454,394
$775,000	$988,469	$440,194
$750,000	$956,583	$425,994
$725,000	$924,697	$411,795
$700,000	$892,811	$397,595
$675,000	$860,925	$383,395
$650,000	$829,039	$369,195
$625,000	$797,153	$354,995
$600,000	$765,266	$340,795
$575,000	$733,380	$326,596
$550,000	$701,494	$312,396
$525,000	$669,608	$298,196
$500,000	$637,722	$286,996
$475,000	$605,836	$269,796
$450,000	$573,950	$255,596
$425,000	$542,064	$241,397
$400,000	$510,177	$227,197
$375,000	$478,291	$212,997
$350,000	$446,405	$198,797
$325,000	$414,519	$184,597
$300,000	$382,633	$170,397
$275,000	$350,747	$156,198
$250,000	$318,861	$141,998
$225,000	$286,975	$127,798
$200,000	$255,088	$113,598
$175,000	$223,202	$99,398
$150,000	$191,316	$85,198
$125,000	$159,430	$70,999
$100,000	$127,544	$56,799