Financial Calculators
Student Loan Calculator
Calculate your monthly student loan payments and total borrowing costs across 10, 15, 20, and 25-year repayment terms. See how extra monthly principal payments accelerate your path to becoming debt-free.
Student Loan Details
$
%
$/mo extra
Repayment Summary
Monthly Payment
$345.24
Across 120 total monthly installments
Original Loan Balance (72%)$30,000
Total Interest Paid (28%)$11,428.92
Total Amount Repaid$41,428.92
Estimate Notice
Financial Disclaimer: This tool provides mathematical estimates for informational and planning purposes only. It does not constitute formal financial, investment, lending, or tax advice. Consult a qualified financial advisor or licensed professional before making major financial commitments.
Month-by-Month Student Loan Amortization
Tracking principal amortization, interest allocation, and declining debt balances.
| Month | Payment | Principal Paid | Interest Paid | Total Interest | Remaining Balance |
|---|---|---|---|---|---|
| Month 1 | $345.24 | $175.24 | $170.00 | $170.00 | $29,824.76 |
| Month 2 | $345.24 | $176.23 | $169.01 | $339.01 | $29,648.52 |
| Month 3 | $345.24 | $177.23 | $168.01 | $507.02 | $29,471.29 |
| Month 4 | $345.24 | $178.24 | $167.00 | $674.02 | $29,293.06 |
| Month 5 | $345.24 | $179.25 | $165.99 | $840.01 | $29,113.81 |
| Month 6 | $345.24 | $180.26 | $164.98 | $1,004.99 | $28,933.55 |
| Month 7 | $345.24 | $181.28 | $163.96 | $1,168.95 | $28,752.26 |
| Month 8 | $345.24 | $182.31 | $162.93 | $1,331.88 | $28,569.95 |
| Month 9 | $345.24 | $183.34 | $161.90 | $1,493.77 | $28,386.61 |
| Month 10 | $345.24 | $184.38 | $160.86 | $1,654.63 | $28,202.22 |
| Month 11 | $345.24 | $185.43 | $159.81 | $1,814.44 | $28,016.79 |
| Month 12 | $345.24 | $186.48 | $158.76 | $1,973.21 | $27,830.31 |
| Month 13 | $345.24 | $187.54 | $157.71 | $2,130.91 | $27,642.78 |
| Month 14 | $345.24 | $188.60 | $156.64 | $2,287.55 | $27,454.18 |
| Month 15 | $345.24 | $189.67 | $155.57 | $2,443.13 | $27,264.51 |
| Month 16 | $345.24 | $190.74 | $154.50 | $2,597.63 | $27,073.77 |
| Month 17 | $345.24 | $191.82 | $153.42 | $2,751.04 | $26,881.95 |
| Month 18 | $345.24 | $192.91 | $152.33 | $2,903.38 | $26,689.04 |
| Month 19 | $345.24 | $194.00 | $151.24 | $3,054.61 | $26,495.03 |
| Month 20 | $345.24 | $195.10 | $150.14 | $3,204.75 | $26,299.93 |
| Month 21 | $345.24 | $196.21 | $149.03 | $3,353.78 | $26,103.72 |
| Month 22 | $345.24 | $197.32 | $147.92 | $3,501.71 | $25,906.40 |
| Month 23 | $345.24 | $198.44 | $146.80 | $3,648.51 | $25,707.97 |
| Month 24 | $345.24 | $199.56 | $145.68 | $3,794.19 | $25,508.40 |
| Month 25 | $345.24 | $200.69 | $144.55 | $3,938.73 | $25,307.71 |
| Month 26 | $345.24 | $201.83 | $143.41 | $4,082.14 | $25,105.88 |
| Month 27 | $345.24 | $202.97 | $142.27 | $4,224.41 | $24,902.90 |
| Month 28 | $345.24 | $204.12 | $141.12 | $4,365.53 | $24,698.78 |
| Month 29 | $345.24 | $205.28 | $139.96 | $4,505.49 | $24,493.50 |
| Month 30 | $345.24 | $206.44 | $138.80 | $4,644.28 | $24,287.05 |
| Month 31 | $345.24 | $207.61 | $137.63 | $4,781.91 | $24,079.44 |
| Month 32 | $345.24 | $208.79 | $136.45 | $4,918.36 | $23,870.65 |
| Month 33 | $345.24 | $209.97 | $135.27 | $5,053.63 | $23,660.68 |
| Month 34 | $345.24 | $211.16 | $134.08 | $5,187.71 | $23,449.51 |
| Month 35 | $345.24 | $212.36 | $132.88 | $5,320.59 | $23,237.15 |
| Month 36 | $345.24 | $213.56 | $131.68 | $5,452.26 | $23,023.59 |
| Month 37 | $345.24 | $214.77 | $130.47 | $5,582.73 | $22,808.81 |
| Month 38 | $345.24 | $215.99 | $129.25 | $5,711.98 | $22,592.82 |
| Month 39 | $345.24 | $217.21 | $128.03 | $5,840.01 | $22,375.61 |
| Month 40 | $345.24 | $218.45 | $126.80 | $5,966.80 | $22,157.16 |
| Month 41 | $345.24 | $219.68 | $125.56 | $6,092.36 | $21,937.48 |
| Month 42 | $345.24 | $220.93 | $124.31 | $6,216.67 | $21,716.55 |
| Month 43 | $345.24 | $222.18 | $123.06 | $6,339.73 | $21,494.37 |
| Month 44 | $345.24 | $223.44 | $121.80 | $6,461.53 | $21,270.93 |
| Month 45 | $345.24 | $224.71 | $120.54 | $6,582.07 | $21,046.22 |
| Month 46 | $345.24 | $225.98 | $119.26 | $6,701.33 | $20,820.24 |
| Month 47 | $345.24 | $227.26 | $117.98 | $6,819.31 | $20,592.98 |
| Month 48 | $345.24 | $228.55 | $116.69 | $6,936.00 | $20,364.44 |
| Month 49 | $345.24 | $229.84 | $115.40 | $7,051.40 | $20,134.59 |
| Month 50 | $345.24 | $231.14 | $114.10 | $7,165.50 | $19,903.45 |
| Month 51 | $345.24 | $232.45 | $112.79 | $7,278.29 | $19,670.99 |
| Month 52 | $345.24 | $233.77 | $111.47 | $7,389.75 | $19,437.22 |
| Month 53 | $345.24 | $235.10 | $110.14 | $7,499.90 | $19,202.13 |
| Month 54 | $345.24 | $236.43 | $108.81 | $7,608.71 | $18,965.70 |
| Month 55 | $345.24 | $237.77 | $107.47 | $7,716.18 | $18,727.93 |
| Month 56 | $345.24 | $239.12 | $106.12 | $7,822.31 | $18,488.81 |
| Month 57 | $345.24 | $240.47 | $104.77 | $7,927.08 | $18,248.34 |
| Month 58 | $345.24 | $241.83 | $103.41 | $8,030.49 | $18,006.51 |
| Month 59 | $345.24 | $243.20 | $102.04 | $8,132.52 | $17,763.30 |
| Month 60 | $345.24 | $244.58 | $100.66 | $8,233.18 | $17,518.72 |
| Month 61 | $345.24 | $245.97 | $99.27 | $8,332.45 | $17,272.75 |
| Month 62 | $345.24 | $247.36 | $97.88 | $8,430.33 | $17,025.39 |
| Month 63 | $345.24 | $248.76 | $96.48 | $8,526.81 | $16,776.63 |
| Month 64 | $345.24 | $250.17 | $95.07 | $8,621.88 | $16,526.45 |
| Month 65 | $345.24 | $251.59 | $93.65 | $8,715.53 | $16,274.86 |
| Month 66 | $345.24 | $253.02 | $92.22 | $8,807.75 | $16,021.85 |
| Month 67 | $345.24 | $254.45 | $90.79 | $8,898.54 | $15,767.40 |
| Month 68 | $345.24 | $255.89 | $89.35 | $8,987.89 | $15,511.50 |
| Month 69 | $345.24 | $257.34 | $87.90 | $9,075.79 | $15,254.16 |
| Month 70 | $345.24 | $258.80 | $86.44 | $9,162.23 | $14,995.36 |
| Month 71 | $345.24 | $260.27 | $84.97 | $9,247.20 | $14,735.09 |
| Month 72 | $345.24 | $261.74 | $83.50 | $9,330.70 | $14,473.35 |
| Month 73 | $345.24 | $263.23 | $82.02 | $9,412.72 | $14,210.13 |
| Month 74 | $345.24 | $264.72 | $80.52 | $9,493.24 | $13,945.41 |
| Month 75 | $345.24 | $266.22 | $79.02 | $9,572.27 | $13,679.19 |
| Month 76 | $345.24 | $267.73 | $77.52 | $9,649.78 | $13,411.47 |
| Month 77 | $345.24 | $269.24 | $76.00 | $9,725.78 | $13,142.22 |
| Month 78 | $345.24 | $270.77 | $74.47 | $9,800.25 | $12,871.45 |
| Month 79 | $345.24 | $272.30 | $72.94 | $9,873.19 | $12,599.15 |
| Month 80 | $345.24 | $273.85 | $71.40 | $9,944.59 | $12,325.31 |
| Month 81 | $345.24 | $275.40 | $69.84 | $10,014.43 | $12,049.91 |
| Month 82 | $345.24 | $276.96 | $68.28 | $10,082.71 | $11,772.95 |
| Month 83 | $345.24 | $278.53 | $66.71 | $10,149.42 | $11,494.42 |
| Month 84 | $345.24 | $280.11 | $65.14 | $10,214.56 | $11,214.32 |
| Month 85 | $345.24 | $281.69 | $63.55 | $10,278.11 | $10,932.62 |
| Month 86 | $345.24 | $283.29 | $61.95 | $10,340.06 | $10,649.33 |
| Month 87 | $345.24 | $284.89 | $60.35 | $10,400.41 | $10,364.44 |
| Month 88 | $345.24 | $286.51 | $58.73 | $10,459.14 | $10,077.93 |
| Month 89 | $345.24 | $288.13 | $57.11 | $10,516.25 | $9,789.80 |
| Month 90 | $345.24 | $289.77 | $55.48 | $10,571.72 | $9,500.03 |
| Month 91 | $345.24 | $291.41 | $53.83 | $10,625.55 | $9,208.62 |
| Month 92 | $345.24 | $293.06 | $52.18 | $10,677.74 | $8,915.57 |
| Month 93 | $345.24 | $294.72 | $50.52 | $10,728.26 | $8,620.85 |
| Month 94 | $345.24 | $296.39 | $48.85 | $10,777.11 | $8,324.46 |
| Month 95 | $345.24 | $298.07 | $47.17 | $10,824.28 | $8,026.39 |
| Month 96 | $345.24 | $299.76 | $45.48 | $10,869.76 | $7,726.63 |
| Month 97 | $345.24 | $301.46 | $43.78 | $10,913.55 | $7,425.17 |
| Month 98 | $345.24 | $303.17 | $42.08 | $10,955.62 | $7,122.01 |
| Month 99 | $345.24 | $304.88 | $40.36 | $10,995.98 | $6,817.12 |
| Month 100 | $345.24 | $306.61 | $38.63 | $11,034.61 | $6,510.51 |
| Month 101 | $345.24 | $308.35 | $36.89 | $11,071.51 | $6,202.17 |
| Month 102 | $345.24 | $310.10 | $35.15 | $11,106.65 | $5,892.07 |
| Month 103 | $345.24 | $311.85 | $33.39 | $11,140.04 | $5,580.22 |
| Month 104 | $345.24 | $313.62 | $31.62 | $11,171.66 | $5,266.60 |
| Month 105 | $345.24 | $315.40 | $29.84 | $11,201.51 | $4,951.20 |
| Month 106 | $345.24 | $317.18 | $28.06 | $11,229.56 | $4,634.02 |
| Month 107 | $345.24 | $318.98 | $26.26 | $11,255.82 | $4,315.04 |
| Month 108 | $345.24 | $320.79 | $24.45 | $11,280.27 | $3,994.25 |
| Month 109 | $345.24 | $322.61 | $22.63 | $11,302.91 | $3,671.64 |
| Month 110 | $345.24 | $324.44 | $20.81 | $11,323.71 | $3,347.20 |
| Month 111 | $345.24 | $326.27 | $18.97 | $11,342.68 | $3,020.93 |
| Month 112 | $345.24 | $328.12 | $17.12 | $11,359.80 | $2,692.81 |
| Month 113 | $345.24 | $329.98 | $15.26 | $11,375.06 | $2,362.83 |
| Month 114 | $345.24 | $331.85 | $13.39 | $11,388.45 | $2,030.98 |
| Month 115 | $345.24 | $333.73 | $11.51 | $11,399.96 | $1,697.24 |
| Month 116 | $345.24 | $335.62 | $9.62 | $11,409.57 | $1,361.62 |
| Month 117 | $345.24 | $337.53 | $7.72 | $11,417.29 | $1,024.09 |
| Month 118 | $345.24 | $339.44 | $5.80 | $11,423.09 | $684.66 |
| Month 119 | $345.24 | $341.36 | $3.88 | $11,426.97 | $343.30 |
| Month 120 | $345.24 | $343.30 | $1.95 | $11,428.92 | $0.00 |
How Student Loan Interest & Repayment Works
Student loans are installment loans designed to fund higher education tuition, room, board, and textbooks. Unlike consumer credit cards, federal student loans feature simple daily interest calculation without monthly capitalization (unless specific triggering events occur, such as leaving deferment).
Each monthly payment is applied in a statutory order: first to any accrued unpaid interest, and secondly to reduce the outstanding principal balance. Because interest accrues based on daily principal, any extra money paid directly reduces subsequent daily interest charges.
Simple Daily Interest Formula (Federal Student Loans)
Daily Interest Accrual = (Principal Balance × APR) ÷ 365.25
Monthly interest charged equals the daily accrual multiplied by the exact number of calendar days in the billing period.
Federal Repayment Plans Compared
Comparison of Federal Student Loan Plans
| Plan Name | Repayment Term | Payment Structure | Total Interest Cost |
|---|---|---|---|
| Standard Repayment | 10 Years (120 months) | Fixed monthly payment | Lowest total interest |
| Graduated Repayment | 10 Years | Starts low, increases every 2 years | Moderate total interest |
| Extended Repayment | 25 Years | Fixed or graduated payments | Higher total interest |
| Income-Driven (IDR/SAVE) | 20 to 25 Years | 5% to 10% of discretionary income | Forgiveness after 20–25 yrs (tax rules vary) |
Frequently Asked Questions
The Standard Repayment Plan is the default 10-year repayment schedule for federal direct student loans. Payments are fixed each month, ensuring the debt is fully paid off in 120 installments while minimizing total interest compared to longer plans.