Mortgage Calculator
A $300,000 mortgage at today's 6.76% average rate runs about $1,950/month over 30 years. Use the calculator below to estimate your own monthly payment, total interest, and amortization schedule.
Estimated Monthly Payment
- Total Principal
- $240,000.00
- Total Interest
- $320,964.21
- Total Cost
- $560,964.21
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Amortization Curve
| Month | Balance | Payment | Principal | Interest |
|---|---|---|---|---|
| Month 1 | $239,793.77 | $1,558.23 | $206.23 | $1,352.00 |
| Month 12 | $237,447.11 | $1,558.23 | $219.38 | $1,338.85 |
| Month 24 | $234,716.21 | $1,558.23 | $234.67 | $1,323.56 |
| Month 36 | $231,794.85 | $1,558.23 | $251.04 | $1,307.19 |
| Month 48 | $228,669.79 | $1,558.23 | $268.54 | $1,289.69 |
| Month 60 | $225,326.79 | $1,558.23 | $287.27 | $1,270.96 |
| Month 72 | $221,750.67 | $1,558.23 | $307.30 | $1,250.93 |
| Month 84 | $217,925.16 | $1,558.23 | $328.73 | $1,229.50 |
| Month 96 | $213,832.89 | $1,558.23 | $351.66 | $1,206.57 |
| Month 108 | $209,455.26 | $1,558.23 | $376.18 | $1,182.05 |
| Month 120 | $204,772.34 | $1,558.23 | $402.41 | $1,155.82 |
| Month 132 | $199,762.87 | $1,558.23 | $430.47 | $1,127.76 |
| Month 144 | $194,404.06 | $1,558.23 | $460.49 | $1,097.74 |
| Month 156 | $188,671.55 | $1,558.23 | $492.61 | $1,065.62 |
| Month 168 | $182,539.30 | $1,558.23 | $526.96 | $1,031.27 |
| Month 180 | $175,979.42 | $1,558.23 | $563.70 | $994.53 |
| Month 192 | $168,962.10 | $1,558.23 | $603.01 | $955.22 |
| Month 204 | $161,455.43 | $1,558.23 | $645.06 | $913.17 |
| Month 216 | $153,425.28 | $1,558.23 | $690.05 | $868.18 |
| Month 228 | $144,835.17 | $1,558.23 | $738.17 | $820.06 |
| Month 240 | $135,646.02 | $1,558.23 | $789.64 | $768.59 |
| Month 252 | $125,816.07 | $1,558.23 | $844.71 | $713.52 |
| Month 264 | $115,300.65 | $1,558.23 | $903.61 | $654.62 |
| Month 276 | $104,051.93 | $1,558.23 | $966.63 | $591.60 |
| Month 288 | $92,018.80 | $1,558.23 | $1,034.03 | $524.20 |
| Month 300 | $79,146.54 | $1,558.23 | $1,106.14 | $452.09 |
| Month 312 | $65,376.63 | $1,558.23 | $1,183.28 | $374.95 |
| Month 324 | $50,646.49 | $1,558.23 | $1,265.79 | $292.44 |
| Month 336 | $34,889.17 | $1,558.23 | $1,354.06 | $204.17 |
| Month 348 | $18,033.01 | $1,558.23 | $1,448.48 | $109.75 |
| Month 360 | $0.00 | $1,559.64 | $1,550.90 | $8.74 |
How Much House Can I Afford?
Your overall housing affordability is ultimately anchored by your standard debt-to-income (DTI) ratio. Most institutional lenders restrict housing expenses to a maximum of 28% of your gross monthly income—covering principal, interest, taxes, and insurance (PITI). Utilizing a larger down payment directly expands your purchasing power by lowering your core loan principal and eliminating Private Mortgage Insurance requirements.
Methodology
This calculator employs month-by-month amortization with penny-accurate rounding, matching how lenders actually calculate billing schedules. The core mathematical payment derivation utilizes standard compound discounting:
* Default interest rates sourced via Federal Reserve Economic Data (FRED).
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Bret Mishler
Bret Mishler is the founder and lead developer of MoneyMage. As a Senior Software Engineer and Tech Lead specializing in enterprise-scale cloud billing systems, Bret brings production-grade financial engineering rigor to personal finance. He built MoneyMage to deliver mathematically transparent, lightning-fast financial tools — applying the same strict precision required to process billions of dollars in cloud infrastructure to your personal wealth.
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