Calculate monthly mortgage payments with amortization schedule. Enter loan amount, interest rate, and term to see total interest paid. Everything runs locally in your browser — nothing is uploaded.
Calculate monthly car loan payments, total interest, and total cost. Enter loan amount, rate, and term for a complete auto financing picture. Everything runs locally in your browser — nothing is uploaded.
Calculate simple interest using principal, rate, and time. Find total interest earned and final amount for basic interest calculations. Everything runs locally in your browser — nothing is uploaded.
Calculate how long it will take to pay off debt with monthly payments. See total interest paid and create a payoff plan. Everything runs locally in your browser — nothing is uploaded.
Calculate trial-to-paid conversion rate. Enter total trials and paid conversions to understand your freemium or trial funnel performance. Everything runs locally in your browser — nothing is uploaded.
Conversion Rate Calculator divides conversions by total visitors and displays the rate as a percentage with configurable decimal precision. Everything runs locally in your browser — nothing is uploaded.
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 the total cost of renting versus buying a home over time. Factor in mortgage payments, rent, and equity growth. Everything runs locally in your browser — nothing is uploaded.
EMI Calculator
Splits a loan principal into equal monthly installments using the standard reducing-balance formula with configurable annual interest and tenure. Everything runs locally in your browser — nothing is uploaded.