Free Financial Calculators

Mortgages, loans, investing, taxes & everyday money math — 24 accurate calculators. No sign-up. Your numbers never leave your browser.

🏠 Loans & Mortgages

Mortgage Calculator

Monthly payment, total interest & payoff schedule for your home loan.

Auto Loan Calculator

Car loan payments, total cost & how down payment changes it.

Student Loan Calculator

Monthly payments and total interest on student debt.

Credit Card Payoff

How long until you're debt-free? See interest savings.

Debt Payoff Planner

Avalanche vs snowball: fastest way out of debt.

House Affordability

How much house can you afford on your salary?

Should you rent or buy? Compare true costs side by side.

📈 Investing & Growth

Compound Interest

Watch your money grow with the 8th wonder of the world.

Investment Growth (SIP)

Monthly investing: what will it be worth?

CAGR Calculator

Annualized return on any investment.

401(k) Calculator

Will you have enough to retire? Project it now.

Inflation Calculator

What will your money be worth in the future?

How much to save monthly to hit your target?

💷 Tax & Income

Income Tax Estimator

US federal & UK tax estimate on your salary.

Paycheck Calculator

Gross to net: what lands in your account?

Salary ⇄ Hourly

Convert salary to hourly wage and back.

SDLT on English property purchases.

Sales Tax Calculator

Price + tax, or work backwards from total.

Tip, total & split the bill fairly.

🔧 Everyday Tools

Percentage Calculator

X% of Y, % change, and more.

Date Calculator

Days between dates, add or subtract days.

Currency Converter

Live exchange rates for 150+ currencies.

The 50/30/20 rule applied to your income.

Invoice Generator

Create & print professional invoices free.

Why Fyvnora?

Accurate math, zero tracking. Every calculator runs entirely in your browser — your salary, debts and savings are never sent to any server.

Built for the US & UK. Tax estimators use real 2025 federal/US and UK bands, stamp duty follows England rates, and mortgage math matches how lenders calculate.

Learn as you calculate. Each tool explains the formula in plain English, so you understand the numbers — not just see them.