Loan Payment Calculator
Calculate fixed monthly loan payments from principal, annual rate, and term. Shows amortization-style payment math. Runs locally in your browser.
Trust summary Engine tested · Specification checked · v1.1.0
- Input interpretation
- Enter values to calculate.
- Result
- —
- Model
- Monthly payment, total paid, and total interest for a fixed-rate amortizing loan.
- Scope
- Fixed rates and terms as entered; no fees or taxes unless modeled.
- Verification
- Engine tested · Specification checked · v1.1.0
- Named expert review
- Optional · Not performed
- Specification basis
- Consumer Financial Protection Bureau (CFPB) — how amortizing loan payments are structured
- Truth in Lending Act / Regulation Z (conceptual) — periodic rate and payment disclosure identities
- Standard mortgage PMT formula: PMT = P·r(1+r)^n / ((1+r)^n − 1) with r = annual/12, n = months
Formulas
Core equations used by this calculator.
How to use
Enter the known values
Fill in each field with amounts and rates as labeled.
Calculate
Results update as you type; compare scenarios below when available.
Read the outputs
Check the result panel for the primary figure and supporting totals.
Example calculations
Common configurations with formula and result.
Worked example
250,000 at 6.5% for 30 years → monthly payment ≈ 1,580.17
Loan Payment calculator specification
Version 1.1.0 · Engine tested
- Engine tested 3 published cases
- Named expert review Not performed
- Calculation version 1.1.0
- Definition
- An amortizing loan payment is the fixed periodic amount that pays down both interest and principal so the balance reaches zero at the end of the term. Monthly payment uses PMT = P·r(1+r)^n / ((1+r)^n−1) with r = annual rate/12 and n = years×12.
- What it calculates
- Monthly payment, total paid, and total interest for a fixed-rate amortizing loan.
- Inputs
- Values shown on the calculator form
- Outputs
- Primary result in the result panel
- Formula
PMT = P·r(1+r)^n / ((1+r)^n−1); r = annual/12; n = years×12- Assumptions
- Fixed rates and terms as entered; no fees or taxes unless modeled.
- Calculation runs locally in the browser.
- Units
- Currency units as entered (dimensionless rates in %)
- Boundary conditions
- Zero or missing required fields yield zero or empty results.
- Negative inputs are treated as zero.
- Example
- 250,000 at 6.5% for 30 years → monthly payment ≈ 1,580.17
- Validation cases
3 published on this page
- 250000 · 6.5% · 30 yr → payment ≈ 1580.17
- 10000 · 0% · 5 yr → payment = 166.67
- 200000 · 4% · 15 yr → payment ≈ 1479.38
- Specification basis
- Consumer Financial Protection Bureau (CFPB) — how amortizing loan payments are structured
- Truth in Lending Act / Regulation Z (conceptual) — periodic rate and payment disclosure identities
- Standard mortgage PMT formula: PMT = P·r(1+r)^n / ((1+r)^n − 1) with r = annual/12, n = months
- Calculation version
- 1.1.0
Background
Interpretation and common distinctions.
About this calculator
An amortizing loan payment is the fixed periodic amount that pays down both interest and principal so the balance reaches zero at the end of the term. Monthly payment uses PMT = P·r(1+r)^n / ((1+r)^n−1) with r = annual rate/12 and n = years×12.
Example
250,000 at 6.5% for 30 years → monthly payment ≈ 1,580.17
Related tools
Other calculators in this family: Compound Interest, Simple Interest, ROI Calculator .
Frequently asked questions
Key distinctions behind the calculation.
How does the Loan Payment Calculator work?
It uses PMT = P·r(1+r)^n / ((1+r)^n−1); r = annual/12; n = years×12. All math runs locally in your browser.
Can I share my inputs?
Yes. Use Copy link in the result panel — the URL stores your current inputs.