Calculate monthly mortgage payments with amortization schedule. Enter loan amount, interest rate, and term to see total interest paid. Figures never leave your device — every calculation runs locally in your browser.
Calculate monthly car loan payments, total interest, and total cost. Enter loan amount, rate, and term for a complete auto financing picture. Figures never leave your device — every calculation runs locally in your browser.
Calculate simple interest using principal, rate, and time. Find total interest earned and final amount for basic interest calculations. Figures never leave your device — every calculation runs locally in your browser.
Compare buy net cost against rent total over a timeframe you set, from home price, down payment, mortgage rate, and monthly rent. Figures never leave your device — every calculation runs locally in your browser.
Calculate customer churn rate by dividing customers lost by total customers. Monitor retention health for your subscription business. Numbers never leave your device — every calculation runs locally in your browser.
Calculate Monthly Recurring Revenue from customer count and average revenue per account (ARPA), with monthly, annual, and ARPU readouts. Example: 120 customers at $49 ARPA = $5,880 MRR. Numbers never leave your device — every calculation runs locally in your browser.
Standard amortization: M = P·r(1+r)^n/((1+r)^n−1). Example: $300,000 at 7% for 30 years (360 months, r=0.00583) → ≈$1,996/month, ≈$418,000 total interest — more interest than principal.
On $300k at 7%: 30-year pays ≈$1,996/mo and $418k interest; 15-year pays ≈$2,697/mo but only ≈$185k interest. The 15-year costs $700/mo more and saves $233k — if cash flow allows.
The 28/36 rule: housing under 28% of gross monthly income, all debts under 36%. $8,000/mo income → ≈$2,240 housing budget → roughly a $335k loan at 7%/30yr before tax and insurance.
Yes disproportionately early: one extra $2,000 payment in year 1 of the example loan saves ≈$7,000 interest and cuts ~4 months. Late-loan extra payments save far less.
No. All calculations run locally in your browser. No amounts or rates leave your device.
Rent vs Buy Calculator
Compare buy net cost against rent total over a timeframe you set, from home price, down payment, mortgage rate, and monthly rent. Figures never leave your device — every calculation runs locally in your browser.
EMI Calculator
Splits a loan principal into equal monthly installments using the standard reducing-balance formula with configurable annual interest and tenure. Figures never leave your device — every calculation runs locally in your browser.
Last updated October 2026