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Loan Calculator
Monthly payments, total interest, and repayment schedules for equal-installment and equal-principal loans.
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When to use it
$100,000 at 4.5% over 30 years, equal installment → about $507/month
Same loan, equal principal → $653/month falling over time
Equal principal saves about $14,800 in total interest
How to use it
1Step 1Fill in Method
2Step 2Change a value and the result updates instantly
3Step 3Save or copy the result
If the result looks off
The result looks wrong
Check the units and the baseline first. Changing a value updates the result instantly.
I want the starting values back
Press reset to return to the initial state.
Frequently asked questions
Which method costs less total interest?
Equal-principal. Equal-installment keeps payments flat instead.
How much does early repayment save?
It removes the interest on the repaid principal. Check your early-repayment fee (often around 1%) before deciding.
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Equal Installment vs Equal Principal
Same loan, hundreds different in total interest depending on the method.
Equal Installment vs Equal Principal
Same loan, hundreds different in total interest depending on the method.