Fidamen

Personal Loan Fixed Rate Calculator

This fixed-rate personal loan calculator estimates the scheduled payment per period, the total amount paid over the loan term, and the total interest paid. It supports common payment frequencies, financed origination fees, and optional extra periodic payments for early payoff planning.

Use the calculator for planning and comparison. Results are model estimates based on inputs you provide; official loan terms, APR disclosures, and lender statements govern the actual amounts.

Updated Nov 13, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record f6c94397e606 • Reviewed by Fidamen Standards Committee

Inputs

Results

Updates as you type

Financed amount (principal + financed origination fee)

$10,000.00

Payment per period

$306.49

Total paid (sum of payments)

$11,033.64

Total interest paid

$1,033.64

OutputValueUnit
Financed amount (principal + financed origination fee)$10,000.00USD
Payment per period$306.49USD
Total paid (sum of payments)$11,033.64USD
Total interest paid$1,033.64USD
Primary result$10,000.00

Visualization

Methodology

The calculator applies standard amortization for fixed-rate installment loans. It computes a periodic interest rate from the annual rate and the selected payments-per-year frequency, then uses the annuity formula to derive the level payment that amortizes the financed balance over the total number of payments.

Origination fees entered as a percentage are assumed financed into the loan balance (added to the principal). Extra periodic payments are added to each scheduled payment and reduce total interest and time to payoff in the estimate.

Worked examples

Example 1: $10,000 principal, 6.5% annual, 3 years, monthly payments, no origination fee → periodic payment calculated using the annuity formula.

Example 2: $15,000 principal, 8% annual, 5 years, biweekly payments, 2% origination fee financed into the loan, $50 extra per payment → shows effect of extra payments on total interest and time to payoff.

F.A.Q.

Does this calculator show APR?

No. This tool shows scheduled payments and totals based on the nominal annual rate you enter. APR includes fees and regulatory rounding methods specific to lender disclosures. Check lender APR statements for legally required figures.

Can I use 0% interest?

The calculator requires a positive interest input for the amortization formula to avoid division by zero. For truly 0% loans, the periodic payment equals financed amount divided by number of payments; verify with your lender.

How accurate are these results?

Results are estimates. Small numeric differences can arise from rounding, different compounding conventions, lender-specific APR calculations, and floating-point arithmetic. Always compare with lender disclosures.

Are fees always financed into the loan?

This calculator treats origination fees as financed into the loan balance. If a lender charges fees upfront or deducts fees from proceeds, the effective financed amount and payment schedule will differ.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: f6c94397e606

What changed (latest)

v1.0.0 • 2025-11-13 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 13, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-13 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: b04abe647ce2