Student Loan Calculator

Free student loan calculator with separate United States and United Kingdom modes. US mode models fixed-rate amortizing repayment with optional extra monthly or one-time payments, deferment months, and interest-only periods. UK mode models income-based repayments as a percentage of salary above a plan threshold, with configurable plan defaults, salary growth, and optional extra payments. See monthly payment, total interest, payoff timeline, amortization or projection schedule, and Pay Off Faster comparisons. Estimates for education and planning only — not financial, legal, tax, or government advice.

How to Use the Student Loan Calculator

Select United States or United Kingdom mode, enter loan and income fields for that region, optionally model extra payments or advanced US options, then calculate to see payment, interest, payoff date, and schedule.

  1. Choose US or UK region at the top of the calculator.
  2. US: enter principal, annual interest rate, and term in years. UK: enter balance, annual salary, and plan (threshold and rate prefilled).
  3. Optional — US Pay Off Faster: extra monthly payment, one-time extra, deferment months, or interest-only months.
  4. Optional — UK: adjust threshold, repayment rate, interest rate, salary growth, or extra monthly payment.
  5. Press Calculate and review monthly payment, total interest, payoff date, and summary cards.
  6. Open the schedule (monthly or yearly) and balance chart to inspect the projection.

US vs UK methodology

  • US: fixed-rate amortizing loan — level payment from balance, rate, and term.
  • UK: repayment ≈ (salary − threshold) × repayment rate when salary exceeds threshold; projection can include salary growth and optional interest on balance.
  • Extra payments reduce outstanding balance faster in both modes where enabled.

Worked examples

  • US: 30,000 at 5% for 10 years → about 318/month with amortization schedule.
  • US: same loan + 50/month extra → earlier payoff and lower total interest.
  • UK Plan 2: 20,000 balance, 45,000 salary → income-based monthly estimate using plan threshold defaults.

Common mistakes

  • Applying US amortizing expectations to UK income-contingent loans.
  • Treating illustrative UK thresholds as guaranteed current GOV.UK values without checking.
  • Assuming federal IDR, PSLF, or forgiveness outcomes from a simplified calculator.
  • Ignoring that actual servicer rounding and capitalization rules may differ slightly.

Limitations

Educational estimates only — not financial, legal, tax, or government advice. US mode does not replicate every federal program. UK mode uses simplified income-based math; verify against GOV.UK and your plan type.

Privacy

Loan balances, salary, and repayment inputs stay in your browser. They are not uploaded to ToolsLibrary servers.

FAQ

How is a student loan payment calculated?

In United States mode, the tool uses a standard fixed-rate amortizing loan formula: balance, annual interest rate, and term determine a level monthly payment that pays interest first and reduces principal. In United Kingdom mode, repayments are modeled as a percentage of income above a plan threshold — not a fixed US-style installment.

How much interest will I pay?

Total interest is the sum of interest charged across the repayment schedule (US) or projection (UK). Extra monthly or one-time payments usually reduce total interest by shortening how long the balance remains outstanding.

Can I pay off my student loan early?

Yes in many cases. Use Pay Off Faster to model extra monthly or one-time payments and see estimated months saved and interest saved. Always check your loan terms and official rules for your loan type.

How does an extra payment affect my loan?

Extra amounts are applied to principal after scheduled interest, which can shorten the payoff timeline and reduce total interest. Comparison cards show original vs accelerated payoff date and interest saved.

Is this calculator accurate for federal student loans?

It provides educational estimates using conventional loan mathematics and optional scenarios. It does not determine U.S. federal eligibility, income-driven repayment amounts, or forgiveness. For official federal rules, use StudentAid.gov.

How are UK student loan repayments different?

UK student loans are typically repaid as a share of income above a plan-specific threshold, not as a fixed amortizing installment. Thresholds and rules change over time; this tool uses configurable plan defaults you can override and verify against GOV.UK.

Does this calculator provide financial advice?

No. Results are estimates for education and planning only. They are not financial, legal, tax, or government advice.

What UK plans are supported?

Plan 1, Plan 2, Plan 4, and Plan 5 presets with illustrative thresholds and repayment rates. Selecting a plan fills default threshold and rate fields — edit them if your circumstances or official tables differ.

What US advanced options exist?

Optional deferment months (no payments), interest-only months, extra monthly payment, and a one-time extra payment in a chosen month. These help model simplified what-if scenarios, not every federal program rule.

Are my loan details uploaded?

No. Balances, rates, salary, and schedules are calculated in your browser and are not uploaded to ToolsLibrary servers.