Free Online Calculators — BMI, Mortgage, Tip & More
From BMI and mortgage payments to tip splitting, age calculation, and scientific math — our calculators give you instant, accurate results with no ads, no sign-up, and no data collection. Works perfectly on mobile.
All Calculator Tools
BMI Calculator
Calculate your Body Mass Index with metric or imperial units.
CalculatorLoan Calculator
Compute monthly payments, interest, and amortization.
CalculatorPercentage Calculator
Find percentages, increase/decrease, and ratios instantly.
CalculatorAge Calculator
Calculate exact age in years, months, days, and hours.
CalculatorTip Calculator
Split bills and calculate tips for any group size.
CalculatorScientific Calculator
Full-featured scientific calculator with history.
CalculatorPomodoro Timer
Focus timer with 25-min work sessions and break alerts.
CalculatorGrade / GPA Calculator
Calculate weighted grades and GPA for any course.
CalculatorDate Difference Calculator
Calculate the exact difference between two dates.
CalculatorStopwatch
Precise stopwatch with lap times and split tracking.
CalculatorCountdown Timer
Set a countdown timer with audio alert when time is up.
CalculatorAspect Ratio Calculator
Calculate and convert aspect ratios for images and videos.
CalculatorTime Zone Converter
Convert times across world time zones instantly.
CalculatorAbout Calculator Tools
Whether you need to check your BMI before a doctor's appointment, figure out monthly payments on a new loan, or just split a restaurant bill fairly, our calculators have you covered. Every calculator on this site is free, works instantly, and runs entirely in your browser.
Our collection covers everyday needs: the BMI Calculator uses WHO standards to classify weight; the Loan Calculator produces a full amortization schedule; the Percentage Calculator handles increase, decrease, and ratio calculations; the Age Calculator gives you your exact age in years, months, and days; and the Tip Calculator splits bills fairly for any group size.
For productivity, we include a Pomodoro Timer to help you stay focused, a Stopwatch with lap tracking, and a Countdown Timer with audio alerts. The Timezone Converter makes it easy to schedule meetings across countries, and the Scientific Calculator supports trigonometry, logarithms, and exponents with full calculation history.
No account is required, no data is saved to any server, and all calculators are fully mobile-responsive. Results are calculated client-side and never transmitted anywhere.
Frequently Asked Questions
Are the calculators mathematically accurate?
Yes. All calculators use standard, industry-accepted formulas. For example, the mortgage calculator uses the standard amortization formula, and the BMI calculator follows WHO guidelines.
Are there any fees or subscriptions?
No. Every calculator on this site is completely free to use with no subscription, no premium tier, and no hidden charges.
Do the calculators work on mobile?
Yes. All calculators are designed to be fully responsive and work well on smartphones, tablets, and desktops.
Do I need an account to use the calculators?
No. You can use every calculator immediately without creating an account or providing any personal information.
Is my input data saved anywhere?
No. All calculations happen in your browser and no data is ever sent to a server or stored in any database.