Financial Calculators

Mortgage Calculator

Estimate a fixed monthly principal-and-interest mortgage payment and its lifetime borrowing cost.

ResultMonthly payment $1,199.10 · total repaid $431,676.38 · total interest $231,676.38.Review the estimated monthly repayment, total repaid, and interest over the full term.

Visual summary

Mortgage balance and interest over time

Compare principal and interest, see how each payment interval changes, and follow the projected balance to payoff.

Total repayment

$431,676total repaid
Principal $200,000Interest $231,676

Principal and interest payments

$0.0$8.6K$17.3KStartYear 15Year 30

Payoff projection

$0.0$100.0K$200.0KStartYear 15Year 30
`r`n
Mortgage balance and interest over time repayment data
PeriodPrincipal paidInterest paidRemaining balance
Start$0.00$0.00$200,000
15 mo$3,093$14,893$196,907
30 mo$3,334$14,653$193,573
45 mo$3,593$14,394$189,980
Year 5$3,872$14,115$186,109
75 mo$4,172$13,814$181,936
90 mo$4,497$13,490$177,440
105 mo$4,846$13,141$172,594
Year 10$5,222$12,764$167,371
135 mo$5,628$12,358$161,743
150 mo$6,065$11,921$155,678
165 mo$6,536$11,450$149,142
Year 15$7,044$10,942$142,098
195 mo$7,591$10,395$134,506
210 mo$8,181$9,805$126,325
225 mo$8,817$9,170$117,509
Year 20$9,501$8,485$108,007
255 mo$10,240$7,747$97,768
270 mo$11,035$6,951$86,733
285 mo$11,892$6,094$74,840
Year 25$12,816$5,170$62,024
315 mo$13,812$4,175$48,212
330 mo$14,885$3,102$33,328
345 mo$16,041$1,946$17,287
Year 30$17,287$699.53$0.00

Mortgage repayment analysis

Explore extra payments, rate sensitivity, refinance break-even, and the complete amortization schedule. Estimates exclude fees, insurance, taxes, penalties, and changing rates.

Extra-payment scenario

Scheduled payment$1,199.10
Payment with extra$1,299.10
New payoff time24 years 7 months
Interest saved$49,138.41

Refinance scenario

Current monthly payment$1,199.10
Proposed monthly payment$1,073.64
Monthly saving$125.46
Break-even time16 months

The estimated monthly saving would recover $2,000.00 in refinancing costs after 16 months.

Remaining balance with and without extra payments
$0.00$100,000.00$200,000.00

Compare interest rates

RateMonthly paymentTotal repaidTotal interest
3%$843.21$303,554.90$103,554.90
4%$954.83$343,739.01$143,739.01
5%$1,073.64$386,511.57$186,511.57
6%$1,199.10$431,676.38$231,676.38
7%$1,330.60$479,017.80$279,017.80
8%$1,467.53$528,310.49$328,310.49
Year-by-year summary (30 years)
YearPrincipal paidInterest paidEnding balance
1$2,456.02$11,933.19$197,543.98
2$2,607.51$11,781.71$194,936.47
3$2,768.33$11,620.88$192,168.14
4$2,939.08$11,450.14$189,229.06
5$3,120.35$11,268.86$186,108.71
6$3,312.81$11,076.41$182,795.91
7$3,517.13$10,872.08$179,278.77
8$3,734.06$10,655.15$175,544.71
9$3,964.37$10,424.84$171,580.34
10$4,208.89$10,180.33$167,371.45
11$4,468.48$9,920.73$162,902.97
12$4,744.09$9,645.13$158,158.88
13$5,036.69$9,352.52$153,122.19
14$5,347.34$9,041.87$147,774.85
15$5,677.16$8,712.06$142,097.69
16$6,027.31$8,361.90$136,070.38
17$6,399.06$7,990.15$129,671.31
18$6,793.74$7,595.47$122,877.57
19$7,212.77$7,176.45$115,664.81
20$7,657.63$6,731.58$108,007.17
21$8,129.94$6,259.27$99,877.23
22$8,631.38$5,757.84$91,245.86
23$9,163.74$5,225.47$82,082.12
24$9,728.94$4,660.27$72,353.17
25$10,329.00$4,060.21$62,024.17
26$10,966.07$3,423.14$51,058.10
27$11,642.43$2,746.78$39,415.67
28$12,360.51$2,028.70$27,055.16
29$13,122.88$1,266.33$13,932.27
30$13,932.27$456.94$0.00
Full monthly amortization schedule (360 months)
MonthPaymentPrincipalInterestBalance
1$1,199.10$199.10$1,000.00$199,800.90
2$1,199.10$200.10$999.00$199,600.80
3$1,199.10$201.10$998.00$199,399.71
4$1,199.10$202.10$997.00$199,197.60
5$1,199.10$203.11$995.99$198,994.49
6$1,199.10$204.13$994.97$198,790.36
7$1,199.10$205.15$993.95$198,585.21
8$1,199.10$206.17$992.93$198,379.04
9$1,199.10$207.21$991.90$198,171.83
10$1,199.10$208.24$990.86$197,963.59
11$1,199.10$209.28$989.82$197,754.31
12$1,199.10$210.33$988.77$197,543.98
13$1,199.10$211.38$987.72$197,332.60
14$1,199.10$212.44$986.66$197,120.16
15$1,199.10$213.50$985.60$196,906.66
16$1,199.10$214.57$984.53$196,692.09
17$1,199.10$215.64$983.46$196,476.45
18$1,199.10$216.72$982.38$196,259.73
19$1,199.10$217.80$981.30$196,041.93
20$1,199.10$218.89$980.21$195,823.04
21$1,199.10$219.99$979.12$195,603.05
22$1,199.10$221.09$978.02$195,381.96
23$1,199.10$222.19$976.91$195,159.77
24$1,199.10$223.30$975.80$194,936.47
25$1,199.10$224.42$974.68$194,712.05
26$1,199.10$225.54$973.56$194,486.51
27$1,199.10$226.67$972.43$194,259.84
28$1,199.10$227.80$971.30$194,032.04
29$1,199.10$228.94$970.16$193,803.10
30$1,199.10$230.09$969.02$193,573.01
31$1,199.10$231.24$967.87$193,341.78
32$1,199.10$232.39$966.71$193,109.39
33$1,199.10$233.55$965.55$192,875.83
34$1,199.10$234.72$964.38$192,641.11
35$1,199.10$235.90$963.21$192,405.22
36$1,199.10$237.07$962.03$192,168.14
37$1,199.10$238.26$960.84$191,929.88
38$1,199.10$239.45$959.65$191,690.43
39$1,199.10$240.65$958.45$191,449.78
40$1,199.10$241.85$957.25$191,207.93
41$1,199.10$243.06$956.04$190,964.87
42$1,199.10$244.28$954.82$190,720.59
43$1,199.10$245.50$953.60$190,475.09
44$1,199.10$246.73$952.38$190,228.37
45$1,199.10$247.96$951.14$189,980.41
46$1,199.10$249.20$949.90$189,731.21
47$1,199.10$250.45$948.66$189,480.76
48$1,199.10$251.70$947.40$189,229.06
49$1,199.10$252.96$946.15$188,976.11
50$1,199.10$254.22$944.88$188,721.89
51$1,199.10$255.49$943.61$188,466.40
52$1,199.10$256.77$942.33$188,209.63
53$1,199.10$258.05$941.05$187,951.57
54$1,199.10$259.34$939.76$187,692.23
55$1,199.10$260.64$938.46$187,431.59
56$1,199.10$261.94$937.16$187,169.65
57$1,199.10$263.25$935.85$186,906.40
58$1,199.10$264.57$934.53$186,641.83
59$1,199.10$265.89$933.21$186,375.94
60$1,199.10$267.22$931.88$186,108.71
61$1,199.10$268.56$930.54$185,840.16
62$1,199.10$269.90$929.20$185,570.26
63$1,199.10$271.25$927.85$185,299.01
64$1,199.10$272.61$926.50$185,026.40
65$1,199.10$273.97$925.13$184,752.43
66$1,199.10$275.34$923.76$184,477.09
67$1,199.10$276.72$922.39$184,200.38
68$1,199.10$278.10$921.00$183,922.28
69$1,199.10$279.49$919.61$183,642.79
70$1,199.10$280.89$918.21$183,361.90
71$1,199.10$282.29$916.81$183,079.61
72$1,199.10$283.70$915.40$182,795.91
73$1,199.10$285.12$913.98$182,510.78
74$1,199.10$286.55$912.55$182,224.24
75$1,199.10$287.98$911.12$181,936.26
76$1,199.10$289.42$909.68$181,646.84
77$1,199.10$290.87$908.23$181,355.97
78$1,199.10$292.32$906.78$181,063.65
79$1,199.10$293.78$905.32$180,769.87
80$1,199.10$295.25$903.85$180,474.62
81$1,199.10$296.73$902.37$180,177.89
82$1,199.10$298.21$900.89$179,879.68
83$1,199.10$299.70$899.40$179,579.97
84$1,199.10$301.20$897.90$179,278.77
85$1,199.10$302.71$896.39$178,976.06
86$1,199.10$304.22$894.88$178,671.84
87$1,199.10$305.74$893.36$178,366.10
88$1,199.10$307.27$891.83$178,058.83
89$1,199.10$308.81$890.29$177,750.02
90$1,199.10$310.35$888.75$177,439.67
91$1,199.10$311.90$887.20$177,127.77
92$1,199.10$313.46$885.64$176,814.31
93$1,199.10$315.03$884.07$176,499.28
94$1,199.10$316.60$882.50$176,182.67
95$1,199.10$318.19$880.91$175,864.49
96$1,199.10$319.78$879.32$175,544.71
97$1,199.10$321.38$877.72$175,223.33
98$1,199.10$322.98$876.12$174,900.35
99$1,199.10$324.60$874.50$174,575.75
100$1,199.10$326.22$872.88$174,249.52
101$1,199.10$327.85$871.25$173,921.67
102$1,199.10$329.49$869.61$173,592.18
103$1,199.10$331.14$867.96$173,261.04
104$1,199.10$332.80$866.31$172,928.24
105$1,199.10$334.46$864.64$172,593.78
106$1,199.10$336.13$862.97$172,257.65
107$1,199.10$337.81$861.29$171,919.84
108$1,199.10$339.50$859.60$171,580.34
109$1,199.10$341.20$857.90$171,239.14
110$1,199.10$342.91$856.20$170,896.23
111$1,199.10$344.62$854.48$170,551.61
112$1,199.10$346.34$852.76$170,205.27
113$1,199.10$348.07$851.03$169,857.19
114$1,199.10$349.82$849.29$169,507.38
115$1,199.10$351.56$847.54$169,155.81
116$1,199.10$353.32$845.78$168,802.49
117$1,199.10$355.09$844.01$168,447.40
118$1,199.10$356.86$842.24$168,090.54
119$1,199.10$358.65$840.45$167,731.89
120$1,199.10$360.44$838.66$167,371.45
121$1,199.10$362.24$836.86$167,009.21
122$1,199.10$364.06$835.05$166,645.15
123$1,199.10$365.88$833.23$166,279.28
124$1,199.10$367.70$831.40$165,911.57
125$1,199.10$369.54$829.56$165,542.03
126$1,199.10$371.39$827.71$165,170.64
127$1,199.10$373.25$825.85$164,797.39
128$1,199.10$375.11$823.99$164,422.28
129$1,199.10$376.99$822.11$164,045.29
130$1,199.10$378.87$820.23$163,666.41
131$1,199.10$380.77$818.33$163,285.64
132$1,199.10$382.67$816.43$162,902.97
133$1,199.10$384.59$814.51$162,518.38
134$1,199.10$386.51$812.59$162,131.87
135$1,199.10$388.44$810.66$161,743.43
136$1,199.10$390.38$808.72$161,353.05
137$1,199.10$392.34$806.77$160,960.71
138$1,199.10$394.30$804.80$160,566.41
139$1,199.10$396.27$802.83$160,170.15
140$1,199.10$398.25$800.85$159,771.90
141$1,199.10$400.24$798.86$159,371.65
142$1,199.10$402.24$796.86$158,969.41
143$1,199.10$404.25$794.85$158,565.16
144$1,199.10$406.28$792.83$158,158.88
145$1,199.10$408.31$790.79$157,750.58
146$1,199.10$410.35$788.75$157,340.23
147$1,199.10$412.40$786.70$156,927.83
148$1,199.10$414.46$784.64$156,513.37
149$1,199.10$416.53$782.57$156,096.83
150$1,199.10$418.62$780.48$155,678.21
151$1,199.10$420.71$778.39$155,257.50
152$1,199.10$422.81$776.29$154,834.69
153$1,199.10$424.93$774.17$154,409.76
154$1,199.10$427.05$772.05$153,982.71
155$1,199.10$429.19$769.91$153,553.52
156$1,199.10$431.33$767.77$153,122.19
157$1,199.10$433.49$765.61$152,688.70
158$1,199.10$435.66$763.44$152,253.04
159$1,199.10$437.84$761.27$151,815.21
160$1,199.10$440.03$759.08$151,375.18
161$1,199.10$442.23$756.88$150,932.96
162$1,199.10$444.44$754.66$150,488.52
163$1,199.10$446.66$752.44$150,041.86
164$1,199.10$448.89$750.21$149,592.97
165$1,199.10$451.14$747.96$149,141.83
166$1,199.10$453.39$745.71$148,688.44
167$1,199.10$455.66$743.44$148,232.78
168$1,199.10$457.94$741.16$147,774.85
169$1,199.10$460.23$738.87$147,314.62
170$1,199.10$462.53$736.57$146,852.09
171$1,199.10$464.84$734.26$146,387.25
172$1,199.10$467.16$731.94$145,920.09
173$1,199.10$469.50$729.60$145,450.58
174$1,199.10$471.85$727.25$144,978.74
175$1,199.10$474.21$724.89$144,504.53
176$1,199.10$476.58$722.52$144,027.95
177$1,199.10$478.96$720.14$143,548.99
178$1,199.10$481.36$717.74$143,067.63
179$1,199.10$483.76$715.34$142,583.87
180$1,199.10$486.18$712.92$142,097.69
181$1,199.10$488.61$710.49$141,609.08
182$1,199.10$491.06$708.05$141,118.02
183$1,199.10$493.51$705.59$140,624.51
184$1,199.10$495.98$703.12$140,128.53
185$1,199.10$498.46$700.64$139,630.07
186$1,199.10$500.95$698.15$139,129.12
187$1,199.10$503.46$695.65$138,625.67
188$1,199.10$505.97$693.13$138,119.69
189$1,199.10$508.50$690.60$137,611.19
190$1,199.10$511.05$688.06$137,100.15
191$1,199.10$513.60$685.50$136,586.55
192$1,199.10$516.17$682.93$136,070.38
193$1,199.10$518.75$680.35$135,551.63
194$1,199.10$521.34$677.76$135,030.29
195$1,199.10$523.95$675.15$134,506.34
196$1,199.10$526.57$672.53$133,979.77
197$1,199.10$529.20$669.90$133,450.56
198$1,199.10$531.85$667.25$132,918.72
199$1,199.10$534.51$664.59$132,384.21
200$1,199.10$537.18$661.92$131,847.03
201$1,199.10$539.87$659.24$131,307.16
202$1,199.10$542.57$656.54$130,764.60
203$1,199.10$545.28$653.82$130,219.32
204$1,199.10$548.00$651.10$129,671.31
205$1,199.10$550.74$648.36$129,120.57
206$1,199.10$553.50$645.60$128,567.07
207$1,199.10$556.27$642.84$128,010.81
208$1,199.10$559.05$640.05$127,451.76
209$1,199.10$561.84$637.26$126,889.92
210$1,199.10$564.65$634.45$126,325.27
211$1,199.10$567.47$631.63$125,757.79
212$1,199.10$570.31$628.79$125,187.48
213$1,199.10$573.16$625.94$124,614.32
214$1,199.10$576.03$623.07$124,038.29
215$1,199.10$578.91$620.19$123,459.38
216$1,199.10$581.80$617.30$122,877.57
217$1,199.10$584.71$614.39$122,292.86
218$1,199.10$587.64$611.46$121,705.22
219$1,199.10$590.57$608.53$121,114.65
220$1,199.10$593.53$605.57$120,521.12
221$1,199.10$596.50$602.61$119,924.62
222$1,199.10$599.48$599.62$119,325.15
223$1,199.10$602.48$596.63$118,722.67
224$1,199.10$605.49$593.61$118,117.18
225$1,199.10$608.52$590.59$117,508.67
226$1,199.10$611.56$587.54$116,897.11
227$1,199.10$614.62$584.49$116,282.49
228$1,199.10$617.69$581.41$115,664.81
229$1,199.10$620.78$578.32$115,044.03
230$1,199.10$623.88$575.22$114,420.15
231$1,199.10$627.00$572.10$113,793.15
232$1,199.10$630.14$568.97$113,163.01
233$1,199.10$633.29$565.82$112,529.73
234$1,199.10$636.45$562.65$111,893.27
235$1,199.10$639.63$559.47$111,253.64
236$1,199.10$642.83$556.27$110,610.81
237$1,199.10$646.05$553.05$109,964.76
238$1,199.10$649.28$549.82$109,315.48
239$1,199.10$652.52$546.58$108,662.96
240$1,199.10$655.79$543.31$108,007.17
241$1,199.10$659.07$540.04$107,348.11
242$1,199.10$662.36$536.74$106,685.75
243$1,199.10$665.67$533.43$106,020.07
244$1,199.10$669.00$530.10$105,351.07
245$1,199.10$672.35$526.76$104,678.73
246$1,199.10$675.71$523.39$104,003.02
247$1,199.10$679.09$520.02$103,323.93
248$1,199.10$682.48$516.62$102,641.45
249$1,199.10$685.89$513.21$101,955.56
250$1,199.10$689.32$509.78$101,266.24
251$1,199.10$692.77$506.33$100,573.47
252$1,199.10$696.23$502.87$99,877.23
253$1,199.10$699.71$499.39$99,177.52
254$1,199.10$703.21$495.89$98,474.30
255$1,199.10$706.73$492.37$97,767.57
256$1,199.10$710.26$488.84$97,057.31
257$1,199.10$713.81$485.29$96,343.50
258$1,199.10$717.38$481.72$95,626.11
259$1,199.10$720.97$478.13$94,905.14
260$1,199.10$724.58$474.53$94,180.57
261$1,199.10$728.20$470.90$93,452.37
262$1,199.10$731.84$467.26$92,720.53
263$1,199.10$735.50$463.60$91,985.03
264$1,199.10$739.18$459.93$91,245.86
265$1,199.10$742.87$456.23$90,502.98
266$1,199.10$746.59$452.51$89,756.40
267$1,199.10$750.32$448.78$89,006.08
268$1,199.10$754.07$445.03$88,252.01
269$1,199.10$757.84$441.26$87,494.17
270$1,199.10$761.63$437.47$86,732.54
271$1,199.10$765.44$433.66$85,967.10
272$1,199.10$769.27$429.84$85,197.83
273$1,199.10$773.11$425.99$84,424.72
274$1,199.10$776.98$422.12$83,647.74
275$1,199.10$780.86$418.24$82,866.88
276$1,199.10$784.77$414.33$82,082.12
277$1,199.10$788.69$410.41$81,293.42
278$1,199.10$792.63$406.47$80,500.79
279$1,199.10$796.60$402.50$79,704.19
280$1,199.10$800.58$398.52$78,903.61
281$1,199.10$804.58$394.52$78,099.03
282$1,199.10$808.61$390.50$77,290.42
283$1,199.10$812.65$386.45$76,477.78
284$1,199.10$816.71$382.39$75,661.06
285$1,199.10$820.80$378.31$74,840.27
286$1,199.10$824.90$374.20$74,015.37
287$1,199.10$829.02$370.08$73,186.34
288$1,199.10$833.17$365.93$72,353.17
289$1,199.10$837.34$361.77$71,515.84
290$1,199.10$841.52$357.58$70,674.32
291$1,199.10$845.73$353.37$69,828.59
292$1,199.10$849.96$349.14$68,978.63
293$1,199.10$854.21$344.89$68,124.42
294$1,199.10$858.48$340.62$67,265.94
295$1,199.10$862.77$336.33$66,403.17
296$1,199.10$867.09$332.02$65,536.09
297$1,199.10$871.42$327.68$64,664.67
298$1,199.10$875.78$323.32$63,788.89
299$1,199.10$880.16$318.94$62,908.73
300$1,199.10$884.56$314.54$62,024.17
301$1,199.10$888.98$310.12$61,135.19
302$1,199.10$893.43$305.68$60,241.77
303$1,199.10$897.89$301.21$59,343.88
304$1,199.10$902.38$296.72$58,441.50
305$1,199.10$906.89$292.21$57,534.60
306$1,199.10$911.43$287.67$56,623.17
307$1,199.10$915.99$283.12$55,707.19
308$1,199.10$920.57$278.54$54,786.62
309$1,199.10$925.17$273.93$53,861.46
310$1,199.10$929.79$269.31$52,931.66
311$1,199.10$934.44$264.66$51,997.22
312$1,199.10$939.11$259.99$51,058.10
313$1,199.10$943.81$255.29$50,114.29
314$1,199.10$948.53$250.57$49,165.76
315$1,199.10$953.27$245.83$48,212.49
316$1,199.10$958.04$241.06$47,254.45
317$1,199.10$962.83$236.27$46,291.62
318$1,199.10$967.64$231.46$45,323.98
319$1,199.10$972.48$226.62$44,351.50
320$1,199.10$977.34$221.76$43,374.16
321$1,199.10$982.23$216.87$42,391.93
322$1,199.10$987.14$211.96$41,404.78
323$1,199.10$992.08$207.02$40,412.71
324$1,199.10$997.04$202.06$39,415.67
325$1,199.10$1,002.02$197.08$38,413.65
326$1,199.10$1,007.03$192.07$37,406.61
327$1,199.10$1,012.07$187.03$36,394.55
328$1,199.10$1,017.13$181.97$35,377.42
329$1,199.10$1,022.21$176.89$34,355.20
330$1,199.10$1,027.33$171.78$33,327.88
331$1,199.10$1,032.46$166.64$32,295.42
332$1,199.10$1,037.62$161.48$31,257.79
333$1,199.10$1,042.81$156.29$30,214.98
334$1,199.10$1,048.03$151.07$29,166.96
335$1,199.10$1,053.27$145.83$28,113.69
336$1,199.10$1,058.53$140.57$27,055.16
337$1,199.10$1,063.83$135.28$25,991.33
338$1,199.10$1,069.14$129.96$24,922.19
339$1,199.10$1,074.49$124.61$23,847.70
340$1,199.10$1,079.86$119.24$22,767.83
341$1,199.10$1,085.26$113.84$21,682.57
342$1,199.10$1,090.69$108.41$20,591.88
343$1,199.10$1,096.14$102.96$19,495.74
344$1,199.10$1,101.62$97.48$18,394.12
345$1,199.10$1,107.13$91.97$17,286.99
346$1,199.10$1,112.67$86.43$16,174.32
347$1,199.10$1,118.23$80.87$15,056.09
348$1,199.10$1,123.82$75.28$13,932.27
349$1,199.10$1,129.44$69.66$12,802.83
350$1,199.10$1,135.09$64.01$11,667.75
351$1,199.10$1,140.76$58.34$10,526.98
352$1,199.10$1,146.47$52.63$9,380.52
353$1,199.10$1,152.20$46.90$8,228.32
354$1,199.10$1,157.96$41.14$7,070.36
355$1,199.10$1,163.75$35.35$5,906.61
356$1,199.10$1,169.57$29.53$4,737.04
357$1,199.10$1,175.42$23.69$3,561.63
358$1,199.10$1,181.29$17.81$2,380.33
359$1,199.10$1,187.20$11.90$1,193.14
360$1,199.10$1,193.14$5.97$0.00

Calculations happen locally in your browser.

How to use this calculator

  1. Enter the mortgage principal, annual interest rate, and term in years, then model extra monthly payments or a lower refinance rate.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

The standard amortization formula produces the scheduled payment and full monthly schedule. Extra payments reduce principal directly; refinance break-even divides costs by monthly savings.

Formula

Payment = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)

Step-by-step calculation

  1. Enter the mortgage principal, annual interest rate, and term in years, then model extra monthly payments or a lower refinance rate.
  2. The standard amortization formula produces the scheduled payment and full monthly schedule. Extra payments reduce principal directly; refinance break-even divides costs by monthly savings.
  3. Check the displayed result, then copy it if needed.

Worked example

A 200,000 mortgage at 6% for 30 years has an estimated scheduled payment of 1,199.10 in the selected currency; an extra 200 per month repays it in about 21 years and saves about 79,800 in interest.

Methodology and review

Who this is for

Borrowers exploring fixed-rate repayment scenarios.

Inputs and units

  • Principal
  • Annual rate
  • Term
  • Currency
  • Optional extra payment and refinance inputs

Method

The standard fixed-payment amortisation formula calculates scheduled payment, then the month-by-month model applies interest, principal, and any entered extra payment until payoff.

Worked example

A 200,000 loan at 4% for 30 years has a scheduled payment of about 954.83 before fees.

Assumptions

  • The interest rate remains fixed, payments are monthly, and payments occur on schedule.
  • Extra payments are applied directly to principal without a lender charge.

Common mistakes

  • Comparing rates without fees
  • Treating an estimate as a lender quote

Limitations

  • Taxes, insurance, fees, changing rates, lender rounding, penalties, and jurisdiction-specific rules are excluded.
  • Refinance comparisons are estimates and do not replace a lender quote or regulated financial advice.

How this tool was checked

Unit tests check payment, amortisation totals, extra-payment payoff effects, rate comparisons, and input boundaries against direct formula fixtures.

Related tools

Calculation review: 21 August 2026. Published by Goldwave Dynamics Limited. This is an internal product review, not an independent certification.

Risk guidance

Frequently asked questions

Does this include taxes, insurance, or fees?

No. The result covers principal and interest only; ownership costs and lender fees must be added separately.

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

Related tools