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ToolGrym

Mortgage Calculator

Calculate your monthly principal-and-interest payment, see the full amortization schedule year by year, and find out exactly how much time and interest extra payments would save.

Written by Daniel Mercer, CFP® · Reviewed by Sarah Lindqvist, CFA

Last reviewed:

$
$
%
years
$

Optional — applied straight to principal each month

Monthly payment (principal & interest)

$1,896.20

Loan amount
$300,000
Total interest
$382,633
Total paid
$732,633
Payoff time
30 yr
Principal $300,000Interest $382,633

Amortization schedule

yearPrincipalInterestBalance
year 1$3,353.18$19,401.27$296,646.82
Amortization schedule — year 1
monthPaymentPrincipalInterestBalance
1$1,896.20$271.20$1,625.00$299,728.80
2$1,896.20$272.67$1,623.53$299,456.12
3$1,896.20$274.15$1,622.05$299,181.97
4$1,896.20$275.64$1,620.57$298,906.34
5$1,896.20$277.13$1,619.08$298,629.21
6$1,896.20$278.63$1,617.57$298,350.58
7$1,896.20$280.14$1,616.07$298,070.44
8$1,896.20$281.66$1,614.55$297,788.79
9$1,896.20$283.18$1,613.02$297,505.60
10$1,896.20$284.72$1,611.49$297,220.89
11$1,896.20$286.26$1,609.95$296,934.63
12$1,896.20$287.81$1,608.40$296,646.82
year 2$3,577.74$19,176.70$293,069.08
Amortization schedule — year 2
monthPaymentPrincipalInterestBalance
13$1,896.20$289.37$1,606.84$296,357.46
14$1,896.20$290.93$1,605.27$296,066.52
15$1,896.20$292.51$1,603.69$295,774.01
16$1,896.20$294.09$1,602.11$295,479.92
17$1,896.20$295.69$1,600.52$295,184.23
18$1,896.20$297.29$1,598.91$294,886.94
19$1,896.20$298.90$1,597.30$294,588.04
20$1,896.20$300.52$1,595.69$294,287.52
21$1,896.20$302.15$1,594.06$293,985.37
22$1,896.20$303.78$1,592.42$293,681.59
23$1,896.20$305.43$1,590.78$293,376.16
24$1,896.20$307.08$1,589.12$293,069.08
year 3$3,817.35$18,937.10$289,251.73
Amortization schedule — year 3
monthPaymentPrincipalInterestBalance
25$1,896.20$308.75$1,587.46$292,760.33
26$1,896.20$310.42$1,585.79$292,449.91
27$1,896.20$312.10$1,584.10$292,137.81
28$1,896.20$313.79$1,582.41$291,824.02
29$1,896.20$315.49$1,580.71$291,508.53
30$1,896.20$317.20$1,579.00$291,191.33
31$1,896.20$318.92$1,577.29$290,872.41
32$1,896.20$320.65$1,575.56$290,551.77
33$1,896.20$322.38$1,573.82$290,229.39
34$1,896.20$324.13$1,572.08$289,905.26
35$1,896.20$325.88$1,570.32$289,579.37
36$1,896.20$327.65$1,568.55$289,251.73
year 4$4,073.01$18,681.44$285,178.72
Amortization schedule — year 4
monthPaymentPrincipalInterestBalance
37$1,896.20$329.42$1,566.78$288,922.30
38$1,896.20$331.21$1,565.00$288,591.09
39$1,896.20$333.00$1,563.20$288,258.09
40$1,896.20$334.81$1,561.40$287,923.29
41$1,896.20$336.62$1,559.58$287,586.67
42$1,896.20$338.44$1,557.76$287,248.22
43$1,896.20$340.28$1,555.93$286,907.95
44$1,896.20$342.12$1,554.08$286,565.83
45$1,896.20$343.97$1,552.23$286,221.85
46$1,896.20$345.84$1,550.37$285,876.02
47$1,896.20$347.71$1,548.50$285,528.31
48$1,896.20$349.59$1,546.61$285,178.72
year 5$4,345.79$18,408.66$280,832.93
Amortization schedule — year 5
monthPaymentPrincipalInterestBalance
49$1,896.20$351.49$1,544.72$284,827.23
50$1,896.20$353.39$1,542.81$284,473.84
51$1,896.20$355.30$1,540.90$284,118.54
52$1,896.20$357.23$1,538.98$283,761.31
53$1,896.20$359.16$1,537.04$283,402.15
54$1,896.20$361.11$1,535.09$283,041.04
55$1,896.20$363.07$1,533.14$282,677.97
56$1,896.20$365.03$1,531.17$282,312.94
57$1,896.20$367.01$1,529.20$281,945.93
58$1,896.20$369.00$1,527.21$281,576.93
59$1,896.20$371.00$1,525.21$281,205.94
60$1,896.20$373.01$1,523.20$280,832.93
year 6$4,636.83$18,117.62$276,196.10
Amortization schedule — year 6
monthPaymentPrincipalInterestBalance
61$1,896.20$375.03$1,521.18$280,457.91
62$1,896.20$377.06$1,519.15$280,080.85
63$1,896.20$379.10$1,517.10$279,701.75
64$1,896.20$381.15$1,515.05$279,320.60
65$1,896.20$383.22$1,512.99$278,937.38
66$1,896.20$385.29$1,510.91$278,552.09
67$1,896.20$387.38$1,508.82$278,164.71
68$1,896.20$389.48$1,506.73$277,775.23
69$1,896.20$391.59$1,504.62$277,383.64
70$1,896.20$393.71$1,502.49$276,989.93
71$1,896.20$395.84$1,500.36$276,594.09
72$1,896.20$397.99$1,498.22$276,196.10
year 7$4,947.37$17,807.08$271,248.73
Amortization schedule — year 7
monthPaymentPrincipalInterestBalance
73$1,896.20$400.14$1,496.06$275,795.96
74$1,896.20$402.31$1,493.89$275,393.65
75$1,896.20$404.49$1,491.72$274,989.16
76$1,896.20$406.68$1,489.52$274,582.48
77$1,896.20$408.88$1,487.32$274,173.60
78$1,896.20$411.10$1,485.11$273,762.50
79$1,896.20$413.32$1,482.88$273,349.18
80$1,896.20$415.56$1,480.64$272,933.62
81$1,896.20$417.81$1,478.39$272,515.80
82$1,896.20$420.08$1,476.13$272,095.73
83$1,896.20$422.35$1,473.85$271,673.37
84$1,896.20$424.64$1,471.56$271,248.73
year 8$5,278.70$17,475.75$265,970.03
Amortization schedule — year 8
monthPaymentPrincipalInterestBalance
85$1,896.20$426.94$1,469.26$270,821.79
86$1,896.20$429.25$1,466.95$270,392.54
87$1,896.20$431.58$1,464.63$269,960.96
88$1,896.20$433.92$1,462.29$269,527.05
89$1,896.20$436.27$1,459.94$269,090.78
90$1,896.20$438.63$1,457.58$268,652.15
91$1,896.20$441.00$1,455.20$268,211.15
92$1,896.20$443.39$1,452.81$267,767.75
93$1,896.20$445.80$1,450.41$267,321.96
94$1,896.20$448.21$1,447.99$266,873.75
95$1,896.20$450.64$1,445.57$266,423.11
96$1,896.20$453.08$1,443.13$265,970.03
year 9$5,632.23$17,122.22$260,337.81
Amortization schedule — year 9
monthPaymentPrincipalInterestBalance
97$1,896.20$455.53$1,440.67$265,514.50
98$1,896.20$458.00$1,438.20$265,056.50
99$1,896.20$460.48$1,435.72$264,596.02
100$1,896.20$462.98$1,433.23$264,133.04
101$1,896.20$465.48$1,430.72$263,667.56
102$1,896.20$468.00$1,428.20$263,199.55
103$1,896.20$470.54$1,425.66$262,729.01
104$1,896.20$473.09$1,423.12$262,255.93
105$1,896.20$475.65$1,420.55$261,780.27
106$1,896.20$478.23$1,417.98$261,302.05
107$1,896.20$480.82$1,415.39$260,821.23
108$1,896.20$483.42$1,412.78$260,337.81
year 10$6,009.43$16,745.02$254,328.38
Amortization schedule — year 10
monthPaymentPrincipalInterestBalance
109$1,896.20$486.04$1,410.16$259,851.77
110$1,896.20$488.67$1,407.53$259,363.09
111$1,896.20$491.32$1,404.88$258,871.77
112$1,896.20$493.98$1,402.22$258,377.79
113$1,896.20$496.66$1,399.55$257,881.13
114$1,896.20$499.35$1,396.86$257,381.78
115$1,896.20$502.05$1,394.15$256,879.73
116$1,896.20$504.77$1,391.43$256,374.96
117$1,896.20$507.51$1,388.70$255,867.45
118$1,896.20$510.26$1,385.95$255,357.20
119$1,896.20$513.02$1,383.18$254,844.18
120$1,896.20$515.80$1,380.41$254,328.38
year 11$6,411.89$16,342.56$247,916.49
Amortization schedule — year 11
monthPaymentPrincipalInterestBalance
121$1,896.20$518.59$1,377.61$253,809.79
122$1,896.20$521.40$1,374.80$253,288.39
123$1,896.20$524.23$1,371.98$252,764.16
124$1,896.20$527.06$1,369.14$252,237.10
125$1,896.20$529.92$1,366.28$251,707.18
126$1,896.20$532.79$1,363.41$251,174.39
127$1,896.20$535.68$1,360.53$250,638.71
128$1,896.20$538.58$1,357.63$250,100.13
129$1,896.20$541.50$1,354.71$249,558.64
130$1,896.20$544.43$1,351.78$249,014.21
131$1,896.20$547.38$1,348.83$248,466.83
132$1,896.20$550.34$1,345.86$247,916.49
year 12$6,841.31$15,913.14$241,075.18
Amortization schedule — year 12
monthPaymentPrincipalInterestBalance
133$1,896.20$553.32$1,342.88$247,363.17
134$1,896.20$556.32$1,339.88$246,806.85
135$1,896.20$559.33$1,336.87$246,247.51
136$1,896.20$562.36$1,333.84$245,685.15
137$1,896.20$565.41$1,330.79$245,119.74
138$1,896.20$568.47$1,327.73$244,551.27
139$1,896.20$571.55$1,324.65$243,979.72
140$1,896.20$574.65$1,321.56$243,405.07
141$1,896.20$577.76$1,318.44$242,827.31
142$1,896.20$580.89$1,315.31$242,246.42
143$1,896.20$584.04$1,312.17$241,662.38
144$1,896.20$587.20$1,309.00$241,075.18
year 13$7,299.48$15,454.97$233,775.70
Amortization schedule — year 13
monthPaymentPrincipalInterestBalance
145$1,896.20$590.38$1,305.82$240,484.80
146$1,896.20$593.58$1,302.63$239,891.23
147$1,896.20$596.79$1,299.41$239,294.43
148$1,896.20$600.03$1,296.18$238,694.41
149$1,896.20$603.28$1,292.93$238,091.13
150$1,896.20$606.54$1,289.66$237,484.59
151$1,896.20$609.83$1,286.37$236,874.76
152$1,896.20$613.13$1,283.07$236,261.63
153$1,896.20$616.45$1,279.75$235,645.17
154$1,896.20$619.79$1,276.41$235,025.38
155$1,896.20$623.15$1,273.05$234,402.23
156$1,896.20$626.53$1,269.68$233,775.70
year 14$7,788.34$14,966.11$225,987.36
Amortization schedule — year 14
monthPaymentPrincipalInterestBalance
157$1,896.20$629.92$1,266.29$233,145.78
158$1,896.20$633.33$1,262.87$232,512.45
159$1,896.20$636.76$1,259.44$231,875.69
160$1,896.20$640.21$1,255.99$231,235.48
161$1,896.20$643.68$1,252.53$230,591.80
162$1,896.20$647.17$1,249.04$229,944.64
163$1,896.20$650.67$1,245.53$229,293.97
164$1,896.20$654.20$1,242.01$228,639.77
165$1,896.20$657.74$1,238.47$227,982.03
166$1,896.20$661.30$1,234.90$227,320.73
167$1,896.20$664.88$1,231.32$226,655.85
168$1,896.20$668.48$1,227.72$225,987.36
year 15$8,309.94$14,444.51$217,677.42
Amortization schedule — year 15
monthPaymentPrincipalInterestBalance
169$1,896.20$672.11$1,224.10$225,315.26
170$1,896.20$675.75$1,220.46$224,639.51
171$1,896.20$679.41$1,216.80$223,960.10
172$1,896.20$683.09$1,213.12$223,277.02
173$1,896.20$686.79$1,209.42$222,590.23
174$1,896.20$690.51$1,205.70$221,899.72
175$1,896.20$694.25$1,201.96$221,205.48
176$1,896.20$698.01$1,198.20$220,507.47
177$1,896.20$701.79$1,194.42$219,805.68
178$1,896.20$705.59$1,190.61$219,100.09
179$1,896.20$709.41$1,186.79$218,390.68
180$1,896.20$713.25$1,182.95$217,677.42
year 16$8,866.47$13,887.98$208,810.95
Amortization schedule — year 16
monthPaymentPrincipalInterestBalance
181$1,896.20$717.12$1,179.09$216,960.31
182$1,896.20$721.00$1,175.20$216,239.30
183$1,896.20$724.91$1,171.30$215,514.40
184$1,896.20$728.83$1,167.37$214,785.56
185$1,896.20$732.78$1,163.42$214,052.78
186$1,896.20$736.75$1,159.45$213,316.03
187$1,896.20$740.74$1,155.46$212,575.28
188$1,896.20$744.75$1,151.45$211,830.53
189$1,896.20$748.79$1,147.42$211,081.74
190$1,896.20$752.84$1,143.36$210,328.90
191$1,896.20$756.92$1,139.28$209,571.97
192$1,896.20$761.02$1,135.18$208,810.95
year 17$9,460.28$13,294.17$199,350.68
Amortization schedule — year 17
monthPaymentPrincipalInterestBalance
193$1,896.20$765.14$1,131.06$208,045.81
194$1,896.20$769.29$1,126.91$207,276.52
195$1,896.20$773.46$1,122.75$206,503.06
196$1,896.20$777.65$1,118.56$205,725.42
197$1,896.20$781.86$1,114.35$204,943.56
198$1,896.20$786.09$1,110.11$204,157.46
199$1,896.20$790.35$1,105.85$203,367.11
200$1,896.20$794.63$1,101.57$202,572.48
201$1,896.20$798.94$1,097.27$201,773.54
202$1,896.20$803.26$1,092.94$200,970.28
203$1,896.20$807.62$1,088.59$200,162.67
204$1,896.20$811.99$1,084.21$199,350.68
year 18$10,093.85$12,660.60$189,256.83
Amortization schedule — year 18
monthPaymentPrincipalInterestBalance
205$1,896.20$816.39$1,079.82$198,534.29
206$1,896.20$820.81$1,075.39$197,713.48
207$1,896.20$825.26$1,070.95$196,888.22
208$1,896.20$829.73$1,066.48$196,058.50
209$1,896.20$834.22$1,061.98$195,224.28
210$1,896.20$838.74$1,057.46$194,385.54
211$1,896.20$843.28$1,052.92$193,542.25
212$1,896.20$847.85$1,048.35$192,694.40
213$1,896.20$852.44$1,043.76$191,841.96
214$1,896.20$857.06$1,039.14$190,984.90
215$1,896.20$861.70$1,034.50$190,123.20
216$1,896.20$866.37$1,029.83$189,256.83
year 19$10,769.85$11,984.60$178,486.98
Amortization schedule — year 19
monthPaymentPrincipalInterestBalance
217$1,896.20$871.06$1,025.14$188,385.77
218$1,896.20$875.78$1,020.42$187,509.98
219$1,896.20$880.52$1,015.68$186,629.46
220$1,896.20$885.29$1,010.91$185,744.16
221$1,896.20$890.09$1,006.11$184,854.07
222$1,896.20$894.91$1,001.29$183,959.16
223$1,896.20$899.76$996.45$183,059.40
224$1,896.20$904.63$991.57$182,154.77
225$1,896.20$909.53$986.67$181,245.24
226$1,896.20$914.46$981.75$180,330.78
227$1,896.20$919.41$976.79$179,411.37
228$1,896.20$924.39$971.81$178,486.98
year 20$11,491.13$11,263.32$166,995.85
Amortization schedule — year 20
monthPaymentPrincipalInterestBalance
229$1,896.20$929.40$966.80$177,557.58
230$1,896.20$934.43$961.77$176,623.14
231$1,896.20$939.50$956.71$175,683.65
232$1,896.20$944.58$951.62$174,739.06
233$1,896.20$949.70$946.50$173,789.36
234$1,896.20$954.85$941.36$172,834.52
235$1,896.20$960.02$936.19$171,874.50
236$1,896.20$965.22$930.99$170,909.28
237$1,896.20$970.45$925.76$169,938.84
238$1,896.20$975.70$920.50$168,963.14
239$1,896.20$980.99$915.22$167,982.15
240$1,896.20$986.30$909.90$166,995.85
year 21$12,260.71$10,493.74$154,735.14
Amortization schedule — year 21
monthPaymentPrincipalInterestBalance
241$1,896.20$991.64$904.56$166,004.20
242$1,896.20$997.01$899.19$165,007.19
243$1,896.20$1,002.42$893.79$164,004.77
244$1,896.20$1,007.84$888.36$162,996.93
245$1,896.20$1,013.30$882.90$161,983.63
246$1,896.20$1,018.79$877.41$160,964.83
247$1,896.20$1,024.31$871.89$159,940.52
248$1,896.20$1,029.86$866.34$158,910.66
249$1,896.20$1,035.44$860.77$157,875.22
250$1,896.20$1,041.05$855.16$156,834.18
251$1,896.20$1,046.69$849.52$155,787.49
252$1,896.20$1,052.36$843.85$154,735.14
year 22$13,081.83$9,672.62$141,653.30
Amortization schedule — year 22
monthPaymentPrincipalInterestBalance
253$1,896.20$1,058.06$838.15$153,677.08
254$1,896.20$1,063.79$832.42$152,613.29
255$1,896.20$1,069.55$826.66$151,543.75
256$1,896.20$1,075.34$820.86$150,468.40
257$1,896.20$1,081.17$815.04$149,387.24
258$1,896.20$1,087.02$809.18$148,300.21
259$1,896.20$1,092.91$803.29$147,207.30
260$1,896.20$1,098.83$797.37$146,108.47
261$1,896.20$1,104.78$791.42$145,003.69
262$1,896.20$1,110.77$785.44$143,892.92
263$1,896.20$1,116.78$779.42$142,776.14
264$1,896.20$1,122.83$773.37$141,653.30
year 23$13,957.95$8,796.50$127,695.36
Amortization schedule — year 23
monthPaymentPrincipalInterestBalance
265$1,896.20$1,128.92$767.29$140,524.39
266$1,896.20$1,135.03$761.17$139,389.36
267$1,896.20$1,141.18$755.03$138,248.18
268$1,896.20$1,147.36$748.84$137,100.82
269$1,896.20$1,153.57$742.63$135,947.25
270$1,896.20$1,159.82$736.38$134,787.42
271$1,896.20$1,166.11$730.10$133,621.32
272$1,896.20$1,172.42$723.78$132,448.89
273$1,896.20$1,178.77$717.43$131,270.12
274$1,896.20$1,185.16$711.05$130,084.96
275$1,896.20$1,191.58$704.63$128,893.39
276$1,896.20$1,198.03$698.17$127,695.36
year 24$14,892.74$7,861.71$112,802.62
Amortization schedule — year 24
monthPaymentPrincipalInterestBalance
277$1,896.20$1,204.52$691.68$126,490.83
278$1,896.20$1,211.05$685.16$125,279.79
279$1,896.20$1,217.61$678.60$124,062.18
280$1,896.20$1,224.20$672.00$122,837.98
281$1,896.20$1,230.83$665.37$121,607.15
282$1,896.20$1,237.50$658.71$120,369.65
283$1,896.20$1,244.20$652.00$119,125.45
284$1,896.20$1,250.94$645.26$117,874.51
285$1,896.20$1,257.72$638.49$116,616.79
286$1,896.20$1,264.53$631.67$115,352.26
287$1,896.20$1,271.38$624.82$114,080.88
288$1,896.20$1,278.27$617.94$112,802.62
year 25$15,890.13$6,864.32$96,912.49
Amortization schedule — year 25
monthPaymentPrincipalInterestBalance
289$1,896.20$1,285.19$611.01$111,517.43
290$1,896.20$1,292.15$604.05$110,225.28
291$1,896.20$1,299.15$597.05$108,926.13
292$1,896.20$1,306.19$590.02$107,619.94
293$1,896.20$1,313.26$582.94$106,306.68
294$1,896.20$1,320.38$575.83$104,986.30
295$1,896.20$1,327.53$568.68$103,658.77
296$1,896.20$1,334.72$561.49$102,324.05
297$1,896.20$1,341.95$554.26$100,982.10
298$1,896.20$1,349.22$546.99$99,632.89
299$1,896.20$1,356.53$539.68$98,276.36
300$1,896.20$1,363.87$532.33$96,912.49
year 26$16,954.32$5,800.13$79,958.16
Amortization schedule — year 26
monthPaymentPrincipalInterestBalance
301$1,896.20$1,371.26$524.94$95,541.22
302$1,896.20$1,378.69$517.51$94,162.54
303$1,896.20$1,386.16$510.05$92,776.38
304$1,896.20$1,393.67$502.54$91,382.71
305$1,896.20$1,401.21$494.99$89,981.50
306$1,896.20$1,408.80$487.40$88,572.69
307$1,896.20$1,416.44$479.77$87,156.26
308$1,896.20$1,424.11$472.10$85,732.15
309$1,896.20$1,431.82$464.38$84,300.33
310$1,896.20$1,439.58$456.63$82,860.75
311$1,896.20$1,447.37$448.83$81,413.38
312$1,896.20$1,455.21$440.99$79,958.16
year 27$18,089.79$4,664.66$61,868.38
Amortization schedule — year 27
monthPaymentPrincipalInterestBalance
313$1,896.20$1,463.10$433.11$78,495.07
314$1,896.20$1,471.02$425.18$77,024.04
315$1,896.20$1,478.99$417.21$75,545.05
316$1,896.20$1,487.00$409.20$74,058.05
317$1,896.20$1,495.06$401.15$72,562.99
318$1,896.20$1,503.15$393.05$71,059.84
319$1,896.20$1,511.30$384.91$69,548.54
320$1,896.20$1,519.48$376.72$68,029.06
321$1,896.20$1,527.71$368.49$66,501.35
322$1,896.20$1,535.99$360.22$64,965.36
323$1,896.20$1,544.31$351.90$63,421.05
324$1,896.20$1,552.67$343.53$61,868.38
year 28$19,301.29$3,453.16$42,567.08
Amortization schedule — year 28
monthPaymentPrincipalInterestBalance
325$1,896.20$1,561.08$335.12$60,307.29
326$1,896.20$1,569.54$326.66$58,737.75
327$1,896.20$1,578.04$318.16$57,159.71
328$1,896.20$1,586.59$309.62$55,573.12
329$1,896.20$1,595.18$301.02$53,977.94
330$1,896.20$1,603.82$292.38$52,374.12
331$1,896.20$1,612.51$283.69$50,761.61
332$1,896.20$1,621.25$274.96$49,140.36
333$1,896.20$1,630.03$266.18$47,510.33
334$1,896.20$1,638.86$257.35$45,871.48
335$1,896.20$1,647.73$248.47$44,223.74
336$1,896.20$1,656.66$239.55$42,567.08
year 29$20,593.94$2,160.51$21,973.15
Amortization schedule — year 29
monthPaymentPrincipalInterestBalance
337$1,896.20$1,665.63$230.57$40,901.45
338$1,896.20$1,674.65$221.55$39,226.80
339$1,896.20$1,683.73$212.48$37,543.07
340$1,896.20$1,692.85$203.36$35,850.23
341$1,896.20$1,702.02$194.19$34,148.21
342$1,896.20$1,711.23$184.97$32,436.98
343$1,896.20$1,720.50$175.70$30,716.47
344$1,896.20$1,729.82$166.38$28,986.65
345$1,896.20$1,739.19$157.01$27,247.46
346$1,896.20$1,748.61$147.59$25,498.84
347$1,896.20$1,758.09$138.12$23,740.76
348$1,896.20$1,767.61$128.60$21,973.15
year 30$21,973.15$781.30$0.00
Amortization schedule — year 30
monthPaymentPrincipalInterestBalance
349$1,896.20$1,777.18$119.02$20,195.97
350$1,896.20$1,786.81$109.39$18,409.16
351$1,896.20$1,796.49$99.72$16,612.67
352$1,896.20$1,806.22$89.99$14,806.45
353$1,896.20$1,816.00$80.20$12,990.45
354$1,896.20$1,825.84$70.36$11,164.61
355$1,896.20$1,835.73$60.47$9,328.88
356$1,896.20$1,845.67$50.53$7,483.21
357$1,896.20$1,855.67$40.53$5,627.54
358$1,896.20$1,865.72$30.48$3,761.82
359$1,896.20$1,875.83$20.38$1,885.99
360$1,896.20$1,885.99$10.22$0.00

What this calculator does

This mortgage calculator computes the fixed monthly payment for a standard amortizing home loan, then breaks the entire loan down month by month: how much of each payment goes to interest, how much reduces your balance, and what you still owe at any point. Add an optional extra monthly payment and it recalculates the payoff date, showing precisely how much interest and time you save.

Because it models principal and interest only, the payment shown is the core borrowing cost — the part determined purely by loan amount, rate, and term. Taxes, insurance, and PMI stack on top and vary by property, so keep them in your budget separately.

How the math works

Fixed-rate mortgages use the standard amortization formula:

M = P · r(1 + r)ⁿ / ((1 + r)ⁿ − 1)

where P is the loan amount, r is the monthly interest rate (the annual rate divided by 12), and n is the total number of monthly payments. The formula finds the one payment amount that, repeated n times, pays exactly all the interest that accrues plus the entire balance — landing on zero with the final payment.

Each month, interest is charged on the remaining balance: interest = balance × r. Whatever is left of your payment after interest reduces the balance. That’s why the interest share starts high and falls over the life of the loan — the schedule below the calculator makes this visible year by year.

A worked example

Take a $350,000 home with $50,000 down — a $300,000 loan — at 6.5% for 30 years:

  • Monthly rate: 6.5% ÷ 12 = 0.5417% (r = 0.0054167)
  • Number of payments: 30 × 12 = 360
  • Payment: 300,000 × 0.0054167 × (1.0054167)³⁶⁰ ÷ ((1.0054167)³⁶⁰ − 1) = $1,896.20

Over 360 payments you would pay about $682,634 in total, of which roughly $382,634 is interest — more than the original loan. Now add $200 extra per month: the loan pays off in about 23 years instead of 30, and total interest drops by roughly $103,000. That is the leverage hiding in the amortization formula, and it’s why it pays to run your own numbers rather than stop at the advertised payment.

Practical tips

  1. Compare rates using the same loan amount and term. A quarter-point difference sounds trivial, but on a $300,000 30-year loan, 6.25% versus 6.5% saves about $49 a month and roughly $17,600 in lifetime interest. The CFPB’s rate-exploration tool (linked below) shows what lenders are actually offering borrowers like you.
  2. Check the payoff-time result, not just the payment. Affordability is monthly, but wealth is total cost. Two loans with similar payments can differ enormously in lifetime interest if the terms differ.
  3. Confirm there’s no prepayment penalty. Most conventional US mortgages allow free extra principal payments, but verify before signing — the note will say explicitly.
  4. Tell your servicer extra payments are “principal only.” Otherwise some servicers apply extras to the next month’s payment instead of reducing the balance, which eliminates the interest savings.

Reading the amortization schedule

The table below the calculator groups payments by year — expand any year to see individual months. Three things worth noticing: the balance falls slowly at first and fast at the end; the crossover point where principal exceeds interest in each payment (around year 19 on a 30-year 6.5% loan); and how dramatically extra payments pull both milestones earlier.

Frequently asked questions

Does this calculator include property taxes and insurance?
No — it calculates principal and interest only. Property taxes, homeowners insurance, PMI, and HOA dues vary widely by location and are usually collected through an escrow account on top of the payment shown here. Budget roughly 1.5–4% of the home value per year for those costs, and confirm actual figures for a specific property with your lender.
How do extra payments shorten a mortgage?
Every extra dollar goes directly to the loan balance. Because each month's interest is calculated on the remaining balance, a smaller balance means less of your next payment is interest and more is principal — an effect that compounds month after month. Even a modest fixed extra payment can remove years from a 30-year loan.
Why is so much of my early payment interest?
Monthly interest equals your balance times the monthly rate. Early in the loan the balance is at its largest, so interest consumes most of the fixed payment. On a $300,000 loan at 6.5%, the first month's interest is $1,625 of the $1,896.20 payment. As the balance falls, the split gradually reverses.
Is it better to make extra payments or a bigger down payment?
A bigger down payment lowers the balance from day one, shrinks the required monthly payment, and can help you avoid PMI if it gets you to 20% down. Extra payments are more flexible — you can stop them if money gets tight. If you already have a comfortable emergency fund, a larger down payment usually wins on pure interest cost; the calculator lets you compare both scenarios.
Does the calculator handle adjustable-rate mortgages (ARMs)?
It models a fixed rate for the full term. For an ARM you can approximate the initial period by entering the intro rate, but payments after the first adjustment depend on future index rates, which no calculator can know in advance. The CFPB recommends stress-testing an ARM at its lifetime rate cap before committing.

Written by

Daniel Mercer, CFP®

Daniel is a Certified Financial Planner™ with 12 years of experience helping households manage debt, savings, and retirement planning. He writes ToolGrym’s calculator guides and explains the math behind every tool.

Reviewed by

Sarah Lindqvist, CFA

Sarah is a CFA charterholder who reviews every ToolGrym calculator and article for mathematical accuracy. She has 10 years of experience in fixed-income analytics and consumer lending models.