amortization calculator
Model your mortgage or loans, analyze extra payments with a debt crusher strategy, stress test variable interest rates, and adjust for inflation.
Financial Calculators
Loan Parameters
$300,000
5 years
5.5%
Debt Crusher™ Strategy
$0/mo
$0/yr
Interest Rate Stress Test
+0%
5 years
Inflation Adjuster (Real Cost)Adjusting for 3% average inflation matches purchasing power. Money in 20+ years will buy much less than today.
Monthly Payment
$5,730.35
Original Term: $5,730/mo
Total Interest Paid
$43,820.92
Baseline: $43,821
Payoff Date
Jul 2031
Original Term: 5 years
Tipping Point Visualizer
In month 1 (Jul 2026), your payment finally goes more toward Principal than Interest.
Loading dashboard charts...
Amortization Schedule
| Month | Payment Date | Monthly | Principal Portion | Interest Portion | Extra Paid | Remaining Balance |
|---|---|---|---|---|---|---|
| #1 | Jul 2026 | $5,730.35 | $4,355.35 | $1,375.00 | - | $295,644.65 |
| #2 | Aug 2026 | $5,730.35 | $4,375.31 | $1,355.04 | - | $291,269.34 |
| #3 | Sep 2026 | $5,730.35 | $4,395.36 | $1,334.98 | - | $286,873.98 |
| #4 | Oct 2026 | $5,730.35 | $4,415.51 | $1,314.84 | - | $282,458.47 |
| #5 | Nov 2026 | $5,730.35 | $4,435.75 | $1,294.60 | - | $278,022.72 |
| #6 | Dec 2026 | $5,730.35 | $4,456.08 | $1,274.27 | - | $273,566.64 |
| #7 | Jan 2027 | $5,730.35 | $4,476.50 | $1,253.85 | - | $269,090.14 |
| #8 | Feb 2027 | $5,730.35 | $4,497.02 | $1,233.33 | - | $264,593.12 |
| #9 | Mar 2027 | $5,730.35 | $4,517.63 | $1,212.72 | - | $260,075.49 |
| #10 | Apr 2027 | $5,730.35 | $4,538.34 | $1,192.01 | - | $255,537.16 |
| #11 | May 2027 | $5,730.35 | $4,559.14 | $1,171.21 | - | $250,978.02 |
| #12 | Jun 2027 | $5,730.35 | $4,580.03 | $1,150.32 | - | $246,397.99 |
| #13 | Jul 2027 | $5,730.35 | $4,601.02 | $1,129.32 | - | $241,796.96 |
| #14 | Aug 2027 | $5,730.35 | $4,622.11 | $1,108.24 | - | $237,174.85 |
| #15 | Sep 2027 | $5,730.35 | $4,643.30 | $1,087.05 | - | $232,531.55 |
| #16 | Oct 2027 | $5,730.35 | $4,664.58 | $1,065.77 | - | $227,866.97 |
| #17 | Nov 2027 | $5,730.35 | $4,685.96 | $1,044.39 | - | $223,181.01 |
| #18 | Dec 2027 | $5,730.35 | $4,707.44 | $1,022.91 | - | $218,473.58 |
| #19 | Jan 2028 | $5,730.35 | $4,729.01 | $1,001.34 | - | $213,744.57 |
| #20 | Feb 2028 | $5,730.35 | $4,750.69 | $979.66 | - | $208,993.88 |
| #21 | Mar 2028 | $5,730.35 | $4,772.46 | $957.89 | - | $204,221.42 |
| #22 | Apr 2028 | $5,730.35 | $4,794.33 | $936.01 | - | $199,427.09 |
| #23 | May 2028 | $5,730.35 | $4,816.31 | $914.04 | - | $194,610.78 |
| #24 | Jun 2028 | $5,730.35 | $4,838.38 | $891.97 | - | $189,772.40 |
| #25 | Jul 2028 | $5,730.35 | $4,860.56 | $869.79 | - | $184,911.84 |
| #26 | Aug 2028 | $5,730.35 | $4,882.84 | $847.51 | - | $180,029.00 |
| #27 | Sep 2028 | $5,730.35 | $4,905.22 | $825.13 | - | $175,123.79 |
| #28 | Oct 2028 | $5,730.35 | $4,927.70 | $802.65 | - | $170,196.09 |
| #29 | Nov 2028 | $5,730.35 | $4,950.28 | $780.07 | - | $165,245.81 |
| #30 | Dec 2028 | $5,730.35 | $4,972.97 | $757.38 | - | $160,272.83 |
| #31 | Jan 2029 | $5,730.35 | $4,995.76 | $734.58 | - | $155,277.07 |
| #32 | Feb 2029 | $5,730.35 | $5,018.66 | $711.69 | - | $150,258.41 |
| #33 | Mar 2029 | $5,730.35 | $5,041.66 | $688.68 | - | $145,216.74 |
| #34 | Apr 2029 | $5,730.35 | $5,064.77 | $665.58 | - | $140,151.97 |
| #35 | May 2029 | $5,730.35 | $5,087.99 | $642.36 | - | $135,063.98 |
| #36 | Jun 2029 | $5,730.35 | $5,111.31 | $619.04 | - | $129,952.68 |
| #37 | Jul 2029 | $5,730.35 | $5,134.73 | $595.62 | - | $124,817.95 |
| #38 | Aug 2029 | $5,730.35 | $5,158.27 | $572.08 | - | $119,659.68 |
| #39 | Sep 2029 | $5,730.35 | $5,181.91 | $548.44 | - | $114,477.77 |
| #40 | Oct 2029 | $5,730.35 | $5,205.66 | $524.69 | - | $109,272.11 |
| #41 | Nov 2029 | $5,730.35 | $5,229.52 | $500.83 | - | $104,042.59 |
| #42 | Dec 2029 | $5,730.35 | $5,253.49 | $476.86 | - | $98,789.11 |
| #43 | Jan 2030 | $5,730.35 | $5,277.57 | $452.78 | - | $93,511.54 |
| #44 | Feb 2030 | $5,730.35 | $5,301.75 | $428.59 | - | $88,209.79 |
| #45 | Mar 2030 | $5,730.35 | $5,326.05 | $404.29 | - | $82,883.74 |
| #46 | Apr 2030 | $5,730.35 | $5,350.46 | $379.88 | - | $77,533.27 |
| #47 | May 2030 | $5,730.35 | $5,374.99 | $355.36 | - | $72,158.28 |
| #48 | Jun 2030 | $5,730.35 | $5,399.62 | $330.73 | - | $66,758.66 |
| #49 | Jul 2030 | $5,730.35 | $5,424.37 | $305.98 | - | $61,334.29 |
| #50 | Aug 2030 | $5,730.35 | $5,449.23 | $281.12 | - | $55,885.05 |
| #51 | Sep 2030 | $5,730.35 | $5,474.21 | $256.14 | - | $50,410.85 |
| #52 | Oct 2030 | $5,730.35 | $5,499.30 | $231.05 | - | $44,911.55 |
| #53 | Nov 2030 | $5,730.35 | $5,524.50 | $205.84 | - | $39,387.04 |
| #54 | Dec 2030 | $5,730.35 | $5,549.82 | $180.52 | - | $33,837.22 |
| #55 | Jan 2031 | $5,730.35 | $5,575.26 | $155.09 | - | $28,261.96 |
| #56 | Feb 2031 | $5,730.35 | $5,600.81 | $129.53 | - | $22,661.14 |
| #57 | Mar 2031 | $5,730.35 | $5,626.49 | $103.86 | - | $17,034.66 |
| #58 | Apr 2031 | $5,730.35 | $5,652.27 | $78.08 | - | $11,382.38 |
| #59 | May 2031 | $5,730.35 | $5,678.18 | $52.17 | - | $5,704.20 |
| #60 | Jun 2031 | $5,730.35 | $5,704.20 | $26.14 | - | $0.00 |
| #61 | Jul 2031 | $5,730.35 | $0.00 | $0.00 | - | $0.00 |
A
=
P
Ă—
r(1 + r)n
(1 + r)n - 1
- A: Periodic Payment (Annuity).
- P: Principal Loan Amount.
- r: Interest Rate per Period (Annual / 12).
- n: Total Number of Periods (Months).
What is amortization calculator?
The Amortization Calculator projects the complete mathematical payment schedule of a fixed-term loan, detailing the chronological breakdown of every installment. It computes the precise shifting ratio of capital applied to accrued interest versus direct principal paydown over the lifecycle of the debt, allowing borrowers to mathematically quantify the absolute cost of capital and establish the exact zero-balance liquidation date.
Practical Calculation Example
Consider a $100,000 commercial loan fully amortized over 10 years (120 months) at a 6.0% fixed Annual Percentage Rate (APR). The calculated monthly obligation is precisely $1,110.21. In the first month, $500.00 of that payment is strictly allocated to service the front-loaded interest, while $610.21 is applied to the principal. By month 119, the mathematical weighting heavily inverses: only $5.52 is directed toward interest, while $1,104.69 is applied directly to the final principal liquidation.
Standard Amortization Frameworks
Institutional lenders and commercial banks structure debt liquidation utilizing specific mathematical frameworks, entirely dependent on the underlying asset class and institutional risk profile:
| Repayment Structure | Financial Mechanics | Typical Banking Application |
|---|---|---|
| Fully Amortized | Fixed monthly payments engineered to completely liquidate the total principal by the exact final term date. | Conventional 15-year or 30-year residential mortgages and standard auto loans. |
| Interest-Only (IO) | Payments cover strictly the accrued interest for a set duration; the underlying principal balance remains 100% intact. | High-net-worth portfolio lines of credit or the initial phases of commercial construction loans. |
| Balloon Payment | Standard amortized monthly payments followed by a massive, mandatory lump-sum principal liquidation at the end of a short term. | Commercial real estate financing and short-term transitional bridge loans. |
| Negative Amortization | The required monthly payment is mathematically lower than the accrued interest, causing the total principal debt to actively compound and increase over time. | Highly distressed debt structures or high-risk variable options; strictly regulated in modern retail banking. |
History and Origin
The mathematical and linguistic concept of amortization originates from the Middle English and Old French derivations of the Latin root admortire, translating literally to "to kill" or "deaden" the debt. The modern, standardized consumer amortization schedule was heavily institutionalized in the United States during the 1930s by the Home Owners' Loan Corporation (HOLC) to stabilize the housing market by replacing historically risky, short-term balloon notes with predictable, long-term 15-year fully amortizing mortgages.
Frequently Asked Questions
How accurate is this amortization calculator tool?
Our tools utilize high-precision floating point math guaranteeing accuracy up to the 6th decimal place.
Is this free to use?
Yes, all converters and calculators on ToolsMetrics are 100% free with no limits.