Loan Amount
$300K
How to Use a Mortgage Calculator — Step-by-Step Guide 2026
Learn how to calculate monthly payments, read amortization schedules, compare loan terms, and understand total interest — free US mortgage guide.Try calculate now
1Initialize Loan Parameters
Input the principal amount, interest rate, and term to generate the baseline amortization schedule.
2Overview & Amortization Chart
Visualize the loan balance trajectory and the shifting proportion of Principal vs. Interest (P&I) over time.
Enter the principal, interest rate, and term first. Then adjust income and promo models for a more accurate estimate.
Using promotional and post-promo rates.
3Detailed Amortization Schedule
Examine the month-by-month repayment breakdown and discover actionable financial insights.
Loan Summary
Quick summary of key metrics to help you evaluate your loan before diving into details.
Total Interest
≈ $376.82K
Total Paid
≈ $676.82K
Monthly Payment
≈ $1.88K/mo
First Payment
$1.61K
Last Payment
$1.89K
Principal > Interest
months 233
When monthly principal exceeds interest.
DTI Ratio
23.5%
Safe
Payment Structure
Principal: 44.3% · Interest: 55.7%
Calculation Assumptions
Fixed-Rate Mortgage (Annuity) · 6.5%/yr · 30 years
4Step 4: Cashflow Charts
Interactive area charts for visual analysis.
Cash Flow Analysis
Loan Balance & Repayment Structure
Monitor the remaining balance, principal, and interest trends by year to visualize how your loan pressure decreases over time.
First Payment
$1,610.46
Average Payment
$1,880.05
Total Interest
$376,817.93
Interest Ratio
125.6%
Remaining Balance
Principal vs Interest Structure
5Step 5: Amortization Table
Detailed breakdown of each payment.
Amortization Schedule
Quick summary of key metrics to help you evaluate your loan before diving into details.
First Month
$1,610.46
Last Month
$1,889.35
Total Interest
$376,817.93
months 1
Principal
$360.46
Interest
$1,250.00
Monthly Payment
$1,610.46
Balance
$299,639.54
months 2
Principal
$361.97
Interest
$1,248.50
Monthly Payment
$1,610.46
Balance
$299,277.57
months 3
Principal
$363.48
Interest
$1,246.99
Monthly Payment
$1,610.46
Balance
$298,914.09
months 4
Principal
$364.99
Interest
$1,245.48
Monthly Payment
$1,610.46
Balance
$298,549.10
months 5
Principal
$366.51
Interest
$1,243.95
Monthly Payment
$1,610.46
Balance
$298,182.59
months 6
Principal
$368.04
Interest
$1,242.43
Monthly Payment
$1,610.46
Balance
$297,814.56
months 7
Principal
$369.57
Interest
$1,240.89
Monthly Payment
$1,610.46
Balance
$297,444.99
months 8
Principal
$371.11
Interest
$1,239.35
Monthly Payment
$1,610.46
Balance
$297,073.87
months 9
Principal
$372.66
Interest
$1,237.81
Monthly Payment
$1,610.46
Balance
$296,701.22
months 10
Principal
$374.21
Interest
$1,236.26
Monthly Payment
$1,610.46
Balance
$296,327.01
months 11
Principal
$375.77
Interest
$1,234.70
Monthly Payment
$1,610.46
Balance
$295,951.24
months 12
Principal
$377.33
Interest
$1,233.13
Monthly Payment
$1,610.46
Balance
$295,573.90
| months | Principal | Interest | Monthly Payment | Balance |
|---|---|---|---|---|
| months 1 | $360.46 | $1,250.00 | $1,610.46 | $299,639.54 |
| months 2 | $361.97 | $1,248.50 | $1,610.46 | $299,277.57 |
| months 3 | $363.48 | $1,246.99 | $1,610.46 | $298,914.09 |
| months 4 | $364.99 | $1,245.48 | $1,610.46 | $298,549.10 |
| months 5 | $366.51 | $1,243.95 | $1,610.46 | $298,182.59 |
| months 6 | $368.04 | $1,242.43 | $1,610.46 | $297,814.56 |
| months 7 | $369.57 | $1,240.89 | $1,610.46 | $297,444.99 |
| months 8 | $371.11 | $1,239.35 | $1,610.46 | $297,073.87 |
| months 9 | $372.66 | $1,237.81 | $1,610.46 | $296,701.22 |
| months 10 | $374.21 | $1,236.26 | $1,610.46 | $296,327.01 |
| months 11 | $375.77 | $1,234.70 | $1,610.46 | $295,951.24 |
| months 12 | $377.33 | $1,233.13 | $1,610.46 | $295,573.90 |
Download Schedule
6Step 6: Financial Insights
Actionable insights for saving money.
Financial Insights
Visualize the impact of prepayments and term changes on your total cost.
First Month
$1.61K
Suggested Income
$8K
DTI Ratio
20.1%
Risk Level
Safe
Monthly Prepayment Impact
By paying an extra $600 monthly toward principal:
Total Interest Savings
$134.19K
Years Cut from Term
9.5 years
Income-based Risk Assessment
Monthly payment accounts for 20.1% of your gross income.
Safe
Tip: Aim to keep your DTI ratio below 40% for financial stability.
LOAN CALCULATOR
Enter the principal, rate, and term to see your estimated monthly payments.