Free Online Calculators

Fast, accurate, and private. Every calculation happens right in your browser — nothing is uploaded, no sign-up needed.

Finance calculators

Compound Interest Calculator

See how savings grow with compounding, plus monthly contributions.

Mortgage Calculator

Estimate monthly payments, total interest, and the true cost of a home loan.

Loan Calculator

Monthly payments and total interest for auto or personal loans.

Take-Home Pay Calculator

Estimate US take-home pay from gross salary and your effective tax rates.

Retirement Savings Calculator

Project your nest egg from savings, contributions, and expected returns.

Inflation Calculator

See future prices and what today's money will actually be worth.

Debt Payoff Calculator

How fast you can get debt-free, total interest, and your payoff date.

Savings Goal Calculator

The monthly deposit needed to hit your savings target on time.

Investment Return Calculator

CAGR, total gain, and return percentage for any investment.

Hourly to Salary Calculator

Convert hourly pay to annual salary and back, with full breakdowns.

Mortgage Refinance Calculator

Monthly savings and the break-even point on closing costs.

Rent vs Buy Calculator

True N-year cost of renting vs buying, with equity and appreciation.

Home Affordability Calculator

Your max housing budget and affordable price via the 28/36 rule.

Roth vs Traditional IRA Calculator

Which retirement account wins at your tax rates, after-tax.

Emergency Fund Calculator

Your safety-net target from real spending, plus monthly savings plan.

Health calculators

BMI Calculator

Body mass index from height and weight, in metric or imperial units.

Sleep Cycle Calculator

Find the best bedtimes or wake-up times based on 90-minute sleep cycles.

Everyday math

Age Calculator

Exact age in years, months, and days between any two dates.

Percentage Calculator

Percent of a number, what-percent, and percentage change — solved instantly.

Tip Calculator

Split the bill and tip fairly between any number of people.

Date Difference Calculator

Days, weeks, and exact years-months-days between two dates.

GPA Calculator

Weighted GPA from grades and credit hours, with plus/minus scale.

BMR & Calorie Calculator

Daily calorie needs for maintenance, loss, or gain (Mifflin-St Jeor).

Discount Calculator

Sale price, tax, and final total — see exactly what you save.

About CalcHub

CalcHub is a collection of free online calculators built for everyday decisions: planning savings, comparing loans, checking a paycheck, or settling a quick math question. Each tool shows its result the moment you type — no page reloads, no accounts, no tracking.

Your numbers never leave your device. All calculations run locally in your browser with plain JavaScript, so the tools work fast and your data stays private.