Online Calculators for Everything
Find free calculators for math, finance, health, business, dates, conversions, and everyday calculations.
Popular Calculators
The most frequently used tools in our directory
Percentage Calculator
Quickly calculate percentages, find what percentage one number is of another, and compute percent changes.
Percentage Increase Calculator
Calculate the percentage increase or decrease between two values, along with absolute difference and growth multipliers.
Average Calculator
Compute the arithmetic mean, median, mode, sum, count, and range for any set of numbers.
Age Calculator
Calculate your exact age in years, months, days, total hours, minutes, and seconds, with a countdown to your next birthday.
Date Difference Calculator
Calculate the exact number of days, weeks, months, years, and business days between two dates.
BMI Calculator
Calculate your Body Mass Index (BMI), identify weight categories, and discover your healthy weight range in metric or imperial units.
Browse by Category
Explore calculators organized across 16 primary categories
Math Calculators
Solve arithmetic, percentages, averages, algebra, geometry, and advanced mathematics problems.
Finance Calculators
Calculate loans, mortgages, compound interest, investments, savings, and retirement planning.
Health Calculators
Monitor your body mass index (BMI), calories, ideal weight, body fat, and wellness metrics.
Date & Time Calculators
Calculate exact age, days between dates, time durations, work days, and countdowns.
Everyday Calculators
Everyday utilities including restaurant tip splitting, discounts, gas mileage, and cooking conversions.
Business Calculators
Calculate profit margins, markup, customer acquisition cost (CAC), runway, and breakeven points.
Education Calculators
GPA calculators, test score curves, grade predictors, study hours, and academic tools.
Unit Conversion Calculators
Convert between metric and imperial units for length, weight, temperature, volume, and area.
How Calculat Works
Powerful calculators, instant results, and 100% free with complete privacy. Follow these easy steps to get accurate results in seconds.
6 Simple Steps to Instant Answers
Search or Browse
Find the calculator you need using search or explore categories & popular tools.
Choose a Calculator
Select any calculator that matches your need. Each tool is designed to be simple and easy to use.
Enter Your Values
Input the required numbers or details. Our calculators support real-time validation for accuracy.
Calculate Instantly
Click the calculate button and get instant, accurate results in a fraction of a second.
View Results
See your results clearly displayed with explanations (when available) to help you understand better.
Use, Save & Share
Use the results, reset for new calculations, or share with others if needed.
100% Free
All calculators are completely free to use.
Fast & Accurate
Get instant results with high accuracy.
Privacy Friendly
We don't store your data. Your privacy is safe.
Mobile Friendly
Works perfectly on desktop, tablet, and mobile devices.
Always Updated
New calculators added regularly.
Vote on What I Code Next🛠️
I deploy new calculators every weekend based on your votes. Vote for the tool you need most for school, work, or daily life!
College & High School GPA Calculator
EducationCalculate weighted and unweighted semester GPA, target GPA goals, and credit hours.
Salary & Take-Home Paycheck Calculator
FinanceEstimate net bi-weekly or monthly take-home pay after federal, state, and payroll deductions.
Scientific & Fraction Calculator
MathTrigonometry, exponents, logarithms, and mixed fractions with step-by-step solutions.
Daily Calorie Deficit & Macro Calculator
HealthCalculate daily maintenance calories, cutting deficits, and protein/carb/fat targets.
Inflation & Purchasing Power Calculator
FinanceCompare historical dollar values and understand real purchasing power over time.
Recently Added
Latest calculation utilities added to Calculat.dev
Tip Calculator
Calculate restaurant tips, split bills equally among friends, and round up totals cleanly for stress-free dining.
Mortgage Calculator
Estimate your complete monthly mortgage payment including principal, interest, property taxes, homeowners insurance, HOA dues, and PMI.
Loan Calculator
Calculate monthly loan payments, total interest paid, and full loan amortization schedules for personal, auto, or business loans.
Compound Interest Calculator
Calculate investment growth over time with compound interest, regular monthly additions, and detailed yearly amortization schedules.
“I built this because I got tired of ad-cluttered calculator websites.”
Hi there! I'm a student developer who uses calculators constantly for math, coding, personal budgeting, and coursework. Whenever I Googled a basic formula, I ended up on giant corporate websites covered in 15 blinking ads, aggressive loan affiliate forms, and slow trackers.
I decided to build Calculat.dev in my spare time as an experiment: what if an online calculator directory was instant, completely free, and performed 100% of calculations right inside your browser with zero tracking?
My mission is to expand this into a comprehensive directory of 500+ free calculators. If Calculat saved you a headache today, bookmarking the site or telling a classmate or colleague helps keep this independent project alive!
Why Use Calculat?
Calculat is designed as a fast, distraction-free calculation engine and utility directory.
Instant & Fast
Calculations execute in real-time as you type, with zero server round-trips or loading delays.
100% Privacy Friendly
Your financial, health, and personal numbers stay exclusively inside your browser. No data logging.
Directory First
Organized logically by topic. Search by name, formula, keyword, or browse by domain category.
Always Free
No accounts, no paywalls, and no deceptive ads placed over inputs or results.