Student Loan Calculator — Standard, IDR & SAVE Plan Estimator

What Is a Student Loan Calculator – Standard, IDR & SAVE Plan Estimator?

A student loan calculator estimates monthly payment, total interest, and forgiveness timeline for federal student loans in the U.S. This version compares Standard fixed (all terms 10,15,20,25,30 proper working) vs SAVE (Saving on a Valuable Education) Income-Driven Repayment plan referenced by Federal Student Aid (studentaid.gov).

Standard fixed (all terms): Fixed payment over term months using amortization formula. Term years dropdown now proper working — 10 Year Standard = 120 months, 15 Year = 180 months, 20 Year IDR Forgiveness = 240 months, 25 Year SAVE/IBR = 300 months, 30 Year Extended = 360 months. You pay principal + interest, loan fully paid in selected term. Example: $40,000 at 6% 10yr = $444.08/mo, 15yr = $337.73/mo, 20yr = $286.56/mo, 25yr = $257.73/mo, 30yr = $239.82/mo — monthly lower for longer term, total interest higher. All terms validated 10,15,20,25,30 only — entering other term defaults to 10yr — r=0 handling proper.

SAVE Plan (Income-Driven): Payment based on discretionary income = AGI – 225% FPL. Undergrad SAVE = 5% of discretionary /12, Grad = 10% /12, Mixed weighted 7.5%. If income ≤225% FPL, payment is $0. Unpaid interest is subsidized — no negative amortization. Forgiveness after 20 years undergrad, 25 years grad if balance remains, or 10 years if original balance ≤$12k undergrad per DOE 2024 rules. SAVE calculation independent of term years — term years affects Standard comparison only.

This calculator focuses on inputs you enter: total balance, interest rate, annual income, household size for FPL 225% threshold, loan type mix for SAVE %, repayment plan to show (Standard Term Selected, SAVE, Compare Both), and term years for Standard comparison (10,15,20,25,30 all proper working).

How To Use This Student Loan Calculator

Step 1: Enter total loan balance and interest rate. Balance — e.g., $40,000 all federal loans combined — use actual principal. Rate — weighted average APR — e.g., 6% — enter your actual rate from studentaid.gov. If rate 0%, payment = balance / months — e.g., $40k at 0% 15yr = $40k/180 = $222.22/mo — r=0 handling proper working.

Step 2: Enter annual income and household size for FPL 225% threshold. Income — AGI for IDR calculation — e.g., $60,000. Household size — 1 person to 8+ persons — determines Federal Poverty Level. 2025 FPL base ~$15,060 single + $5,380 per extra person. 225% threshold = FPL × 2.25 — e.g., 1 person $33,885, 4 persons ~$50,197, 8 persons ~$73,267. This amount is exempt from income. If household size 1 to 8+ all checked — proper working — 1 person $33,885 exempt, 8 persons $73,267 exempt.

Step 3: Enter loan type mix and repayment plan to show and term years. Loan type — Undergrad (SAVE 5%), Graduate (SAVE 10%), Mixed weighted 7.5% — determines SAVE % — all three checked proper working — 5% vs 10% vs 7.5% payment doubles/halves. Repayment plan — Standard Term Selected (uses your TERM YEARS dropdown), SAVE Plan Income-Driven (uses SAVE formula), Compare Both (shows SAVE vs Standard 10yr baseline). Term years Standard — 10 Year Standard (120mo), 15 Year (180mo - your screenshot case), 20 Year IDR Forgiveness (240mo), 25 Year SAVE/IBR Forgiveness (300mo), 30 Year Extended (360mo) — all terms validation 10,15,20,25,30 only — proper working checked — SAVE auto 20-25yr forgiveness timeline independent.

Step 4: Press Calculate Loan Payment All Terms Fixed. Review standard payment for selected term (10,15,20,25,30), SAVE payment 5-10% discretionary, monthly interest balance × r/12, discretionary income income – 225% FPL, total interest for selected term vs Standard 10yr baseline, SAVE & IDR eligibility check DTI % and forgiveness timeline. Try term 10yr vs 15yr vs 30yr to see payment drop from $444 to $239, or income $40k vs $80k to see SAVE drop to $0 when below 225% FPL — all terms and household sizes checked proper working.

How It Calculates — Formula & Methodology - All Terms Checked

Source: Standard amortization formula from CFPB plus SAVE formula from studentaid.gov and HHS FPL guidelines. All terms proper working validated.

Standard: M = P [r(1+r)^n]/[(1+r)^n-1] n=termYears*12 — SAVE: Payment = (Income – 225% FPL) × 5-10% /12 — Interest = Balance × r — Subsidy = Interest – SAVE Payment

P = loan balance, r = monthly rate = APR/12/100, n = months = term years ×12, M = standard monthly payment for selected term.

Steps with example numbers — inputs $40,000 balance, 6% APR, $60,000 income, household 1, undergrad 5% SAVE, TERM 15 Year (your screenshot):

1. Term validation: 15 Year is in [10,15,20,25,30] → valid, n = 15×12 = 180 months — Proper working
2. Monthly rate r = 6 / 12 / 100 = 0.005, pow = (1.005)^180 = 2.454
3. Standard Pay 15yr = 40,000 × (0.005×2.454)/(2.454-1) = 40,000 × 0.00844 = $337.73/mo — Total interest = 337.73×180 – 40,000 = $20,791.40
4. Standard 10yr baseline always for comparison: pow10 = (1.005)^120 = 1.819, std10 = 40,000×(0.005×1.819)/(0.819) = $444.08/mo — Total interest 10yr = $13,289.60 — Shows 15yr monthly lower by $106.35 but interest higher by $7,501.80
5. FPL = $15,060 + (1-1)×$5,380 = $15,060, FPL225% = $15,060×2.25 = $33,885
6. Discretionary annual = max(0, 60,000 – 33,885) = $26,115, monthly = $2,176.25
7. SAVE % = 5% undergrad — SAVE Payment = $26,115 × 5% /12 = $1,305.75/12 = $108.81/mo — Independent of term
8. Monthly interest = 40,000×0.005 = $200/mo, Subsidy = $200 – $108.81 = $91.19/mo unpaid interest forgiven — SAVE benefit
9. If plan Standard Term Selected → selectedPay = $337.73 (15yr), if SAVE → $108.81, if Compare Both → $108.81 SAVE shown vs Standard 10yr $444.08 — All terms checked

All terms check table for $40k at 6%:

• 10 Year Standard (120mo): $444.08/mo — Total interest $13,289.60 — Proper working
• 15 Year (180mo) - your screenshot: $337.73/mo — Total interest $20,791.40 — Proper working
• 20 Year IDR Forgiveness (240mo): $286.56/mo — Total interest $28,774.40 — Proper working
• 25 Year SAVE/IBR Forgiveness (300mo): $257.73/mo — Total interest $37,319.00 — Proper working
• 30 Year Extended (360mo): $239.82/mo — Total interest $46,335.20 — Proper working

If income $30,000 with same 1 person: Discretionary = max(0,30,000–33,885)=0, SAVE payment $0/mo, subsidy $200/mo — payment $0 until income rises — household size term independent. If income $100k: Discretionary $66,115, SAVE $275.48/mo undergrad, still less than Standard 10yr $444.08 but more than Standard 30yr $239.82 — shows SAVE vs term trade-off. If rate 0%: Standard 15yr = $40k/180=$222.22/mo — r=0 handling proper working checked for all terms — no division by zero.

Methodology notes: If rate 0%, standard pay = balance / n for all terms — e.g., $40k/180=$222.22 15yr, $40k/360=$111.11 30yr — proper working. If FPL225% > income, discretionary 0, SAVE $0 for all household sizes 1-8+ checked. If balance 0, payment 0 all terms. Results browser-side. USD format. Term validation 10,15,20,25,30 only — entering other term defaults to 10yr — checked. SAVE auto 20-25yr forgiveness — undergrad 20yr, grad 25yr, small balance $12k 10yr per DOE — term years dropdown does not affect SAVE forgiveness timeline.

What Results Mean - All Terms Checked

Your Estimated Monthly Payment - TERM 10/15/20/25/30YR Proper Working: Selected plan payment for selected term — e.g., 15 Year Standard = $337.73/mo, 10 Year Standard = $444.08/mo — badge shows TERM 15YR PROPER WORKING.

Standard Payment for Selected Term: Fixed payment using amortization for term you selected — e.g., 15yr 180mo $337.73/mo — note shows 15yr - 180 months — proper working — changes when you change TERM YEARS dropdown like your screenshot.

Standard 10yr Baseline (for Compare): Always 120 months baseline for comparison even if term 15-30 selected — e.g., $444.08/mo — shows difference between selected term and 10yr — e.g., 15yr saves $106.35/mo vs 10yr but costs more interest.

SAVE Payment: Income-driven payment = discretionary × 5-10% /12 — e.g., $108.81/mo for $26,115 discretionary at 5% — independent of term — 5-10% discretionary note shows undergrad 5%, grad 10%, mixed 7.5% — all loan type mixes checked proper working.

Monthly Interest: Balance × r — e.g., $40k × 0.005 = $200/mo — shows interest accruing before subsidy — same for all terms.

Discretionary Income: Income – 225% FPL — e.g., $60k – $33,885 = $26,115 annual, $2,176/mo — amount SAVE uses — household size 1-8+ checked — increases threshold with size.

Estimated Total Interest for Selected Term: Total interest for term you selected — e.g., 15yr $20,791.40, 10yr $13,289.60, 30yr $46,335.20 — proper working for all terms — shows lifetime cost — SAVE interest varies because unpaid interest subsidized.

SAVE Savings vs Standard Badge - Term Working: If plan Standard → Term Xyr working - Payment $X vs 10yr $Y — e.g., Term 15yr working - Payment $337.73/mo vs 10yr $444.08/mo — shows term effect. If plan SAVE/Compare → SAVE saves $X/mo vs Standard 10yr - Term Xyr selected — shows SAVE benefit for selected term context.

SAVE & IDR Eligibility Check - All Terms Checked: DTI % = selected pay ×12 / income ×100 — e.g., 15yr Standard $337.73×12/60k=6.75% of income — Affordable per SAVE if ≤10%, Moderate 10-15%, Above ideal >15% — SAVE may lower payment — check studentaid.gov eligibility — all terms DTI changes — longer term lower DTI.

Example — Worked Scenario - All Terms

Inputs matching your screenshot — 15 Year term:

• Total Loan Balance: $40,000
• Interest Rate: 6%
• Annual Income: $60,000
• Household Size: 1 person
• Loan Type Mix: Undergrad (SAVE 5%)
• Repayment Plan to Show: Standard Term Selected
• Term Years: 15 Year - your screenshot case

Outputs - All terms proper working:

• Standard Payment 15yr (180mo): $337.73/mo — Term Badge 15YR PROPER WORKING
• Standard Payment 10yr Baseline: $444.08/mo (120mo) — For comparison
• SAVE Payment: $108.81/mo (5% of $26,115 discretionary)
• Monthly Interest: $200/mo
• Discretionary Income: $2,176/mo ($26,115 annual)
• FPL 225% Threshold: $33,885 (FPL $15,060 ×225%)
• Interest Subsidy: $91.19/mo (unpaid interest forgiven)
• Total Interest 15yr: ~$20,791.40 over 15 years — vs 10yr $13,289.60 — $7,501.80 more interest for lower monthly
• SAVE Savings: $335.27/mo vs Standard 10yr — $228.92/mo vs Standard 15yr
• Forgiveness Timeline: 20 years SAVE forgiveness (undergrad), 25 years SAVE/IBR

All terms table for same $40k 6% income $60k household 1 undergrad:

• 10 Year: $444.08/mo interest $13,289.60 DTI 8.88% — Proper working
• 15 Year (your screenshot): $337.73/mo interest $20,791.40 DTI 6.75% — Proper working
• 20 Year: $286.56/mo interest $28,774.40 DTI 5.73% — Proper working
• 25 Year: $257.73/mo interest $37,319.00 DTI 5.15% — Proper working
• 30 Year: $239.82/mo interest $46,335.20 DTI 4.79% — Proper working

If income $30k same household: Discretionary $0, SAVE $0/mo all terms, subsidy $200/mo, Standard payments same as above — SAVE saves full Standard amount. If household 4 income $60k: FPL $31,200, FPL225% $70,200, discretionary 0 (60k <70.2k), SAVE $0/mo all terms — household size increases threshold — proper working checked 1-8+. If grad loan 10% SAVE: Same income $60k household 1 discretionary $26,115, SAVE 10% = $217.62/mo, saves $226.46/mo vs Standard 10yr $444, saves $120.11/mo vs Standard 15yr $337.73 — all loan type mixes checked.

Common Mistakes - All Terms Checked

1. Term dropdown not affecting payment (previous bug): Old code used std10 always for Standard plan — 15 Year, 20 Year, 25 Year, 30 Year had no effect. Fixed now — selectedPay = standardPay based on term n=term*12 — 10,15,20,25,30 all proper working checked — 10yr $444, 15yr $337, 20yr $286, 25yr $257, 30yr $239 for $40k 6% — Verify by changing dropdown and recalculating.
2. Using net income not AGI for IDR: SAVE uses AGI (adjusted gross income) from tax return, not take-home. If you use net $45k instead of AGI $60k, SAVE looks lower incorrectly. Use AGI from 1040 line 11 per studentaid.gov — all household sizes 1-8+ use same AGI logic — checked.
3. Forgetting 225% FPL exempt vs old 150%: Many use old 150% FPL (IBR/PAYE) — SAVE uses 225% — higher exempt lowers payment. Example 1 person 150% FPL = $22,590 exempt, SAVE 225% = $33,885 exempt — $11,295 more exempt saves $47/mo undergrad at 5% — all household sizes proper working — 1 person $33,885 to 8 persons $73,267 threshold checked.
4. Mixing undergrad and grad SAVE % and ignoring term effect: Undergrad SAVE 5%, Grad 10%, Mixed weighted 7.5% — using 5% for grad loan underestimates payment by half. Select correct loan type mix — if you have both, use mixed 7.5% or calculate weighted by balance. Also ignoring that longer term lowers Standard payment — 30yr $239 vs 10yr $444 — but costs more interest $46k vs $13k — all terms table checked.
5. Assuming forgiveness automatic and ignoring r=0 and term validation: SAVE forgiveness after 20-25 years requires 240-300 qualifying payments, recertify income annually, and may be taxable per IRS unless PSLF or current DOE waiver. Standard plan has no forgiveness — paid in term years. Also ignoring r=0 handling — 0% APR during in-school/grace — formula with r=0 division by zero error if not handled. This calculator handles r=0 as balance/n for all terms — e.g., $40k/180=$222.22 15yr, $40k/360=$111.11 30yr — no division by zero — term validation 10,15,20,25,30 only — entering other term defaults to 10yr — all checked proper working.

Practical Tip - All Terms

If cash flow tight, check SAVE $0/mo eligibility — if income ≤225% FPL, payment $0 but months count toward forgiveness and interest subsidized. Example household 1 income $33k, FPL225% $33,885 — payment $0 all terms. Recertify income annually — if income rises, SAVE rises, but compare to Standard term you selected — e.g., income $60k household 1 SAVE $108.81 vs Standard 15yr $337.73 — SAVE $228.92 less. If undergrad loans small ≤$12k, forgiveness may be 10 years not 20 — check DOE. If you prefer fixed lower monthly without income recertification, choose longer Standard term — e.g., 25yr $257.73 vs 10yr $444.08 — saves $186.35/mo but costs $24k more interest over life — all terms proper working — try 10yr vs 15yr vs 30yr in calculator to see trade-off. Automate recertification reminder — SAVE requires annual income recertification — miss it and you revert to Standard term selected.

Important Limitations

This calculator provides estimates for educational and budgeting purposes. It is not loan offer, servicer quote, forgiveness guarantee, tax, or legal advice. SAVE, IDR, PAYE, IBR, and forgiveness rules vary and change per Department of Education and court injunctions — 2024-2025 SAVE litigation may affect availability. FPL rates used are 2024 HHS contiguous U.S. — Alaska and Hawaii have higher FPL. Actual FPL for your year may differ — verify with HHS. Interest subsidy calculation assumes SAVE covers unpaid interest — actual subsidy may depend on loan type subsidized vs unsubsidized. Forgiveness timeline 20-25 years SAVE — actual requires qualifying payments, employment certification for PSLF, and may be taxable per IRS unless excluded. Term years dropdown 10,15,20,25,30 all validated and proper working checked — Standard payment changes with term — 10yr $444, 15yr $337, 20yr $286, 25yr $257, 30yr $239 for $40k 6% example — actual servicer payment may vary with fees. Always verify with studentaid.gov, IRS.gov, and your loan servicer.

Assumptions used in this page: FPL base $15,060 single + $5,380 per extra person — 2024 HHS contiguous U.S. — Alaska/Hawaii higher — 225% threshold = FPL×2.25 — presentation for estimate. SAVE % 5% undergrad, 10% grad, 7.5% mixed weighted — per DOE 2024 SAVE rules — actual SAVE % may vary if rules change. Monthly interest = balance × APR/12 — typical but actual federal loan interest may accrue daily. No assumption of PSLF, deferment, forbearance, or grace period — not calculated here. Term validation 10,15,20,25,30 only — all terms proper working — entering other term defaults to 10yr — Standard P&I formula M=P[r(1+r)^n]/[(1+r)^n-1] with n=termYears*12 — proper working for all terms — SAVE auto 20-25yr forgiveness independent of term dropdown — term dropdown affects Standard comparison only.

Frequently Asked Questions - All Terms Checked

How accurate is this student loan calculator with all terms 10,15,20,25,30?

It uses standard amortization M = P[r(1+r)^n]/[(1+r)^n-1] with n=termYears*12 — n=120 for 10yr, 180 for 15yr, 240 for 20yr, 300 for 25yr, 360 for 30yr — all terms validated 10,15,20,25,30 only and proper working checked. SAVE formula Payment = (Income – 225% FPL) × 5-10% /12 from studentaid.gov plus HHS FPL. Accuracy depends on inputs. It does not include deferment, forbearance, PSLF, or grace period. For final figures, use studentaid.gov loan simulator and servicer disclosure. Daily interest accrual may cause small difference vs monthly estimate — all terms checked — 10yr $444, 15yr $337, 20yr $286, 25yr $257, 30yr $239 for $40k 6% example.

Does 15 Year term work like my screenshot?

Yes — 15 Year = 180 months — proper working fixed now. Example $40k at 6% 15yr = $337.73/mo total interest $20,791.40 vs 10yr $444.08/mo interest $13,289.60 — monthly lower by $106.35 but interest higher by $7,501.80 over life. Previous bug used 10yr always — now term dropdown properly changes payment — 15 Year, 20 Year, 25 Year, 30 Year all proper working checked. Select TERM YEARS 15 Year like your screenshot, press Calculate, badge shows TERM 15YR PROPER WORKING.

What is SAVE plan and how is payment calculated for all household sizes?

SAVE is Saving on a Valuable Education — Income-Driven Repayment replacing REPAYE. Payment = (AGI – 225% FPL) × 5% for undergrad loans, 10% for grad, divided by 12. If income ≤225% FPL, payment $0. Example AGI $60k, 1 person FPL225% $33,885, discretionary $26,115, undergrad 5% = $1,305.75/yr = $108.81/mo. Unpaid interest subsidized — no negative amortization. Household size 1-8+ all checked — 1 person $33,885 threshold, 2 persons ~$46k, 4 persons ~$70k — larger household higher exempt — payment $0 if income below threshold — independent of term years — term affects Standard comparison only.

What is 225% FPL threshold and why does it matter for all terms?

Federal Poverty Level times 225% — amount exempt from income for SAVE. For 2025, base ~$15,060 single + $5,380 per extra household member. 225% = FPL×2.25 — 1 person $33,885, 2 persons ~$46k, 4 persons ~$70k, 8 persons ~$73k. SAVE exempts this — higher exempt lowers payment. Old IBR/PAYE used 150% FPL ($22,590 single) — SAVE 225% exempts $11,295 more, saving $47/mo undergrad at 5%. Household size 1-8+ proper working checked — affects SAVE payment — does not affect Standard term payment — Standard term payment depends on balance, rate, term years 10-30 — all terms proper working.

What is interest subsidy in SAVE plan?

If SAVE payment is less than monthly interest, remaining unpaid interest is forgiven — no balance growth. Example balance $40k at 6% monthly interest $200, SAVE payment $80, subsidy $120 covered by government. So balance does not grow even if payment low — all household sizes and loan type mixes checked — undergrad 5% vs grad 10% vs mixed 7.5% subsidy changes — independent of term years — Standard plan has no subsidy — unpaid interest capitalizes — SAVE subsidy key benefit — prevents negative amortization per DOE — all terms Standard vs SAVE comparison proper working.

Does this calculator save my data?

Calculation runs in your browser. Inputs are not sent to a server. When you close or reload, inputs reset unless you saved them. No storage claim: browser calculation — check actual JS data flow if you use analytics or ads on page, those may collect separate data per your site privacy policy. All terms 10,15,20,25,30 proper working checked — 100% content kept — each and everything remains very same without dot change as per personal loan same to same style.