Free Online Calculators
What would you like to calculate today? Find the right calculator for your needs — finance, health, math, dates, conversions and more. Fast, free and easy to use.
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Quickly find the right calculator for your task.
Mortgage, auto, personal loans and more
Salary, taxes and take-home pay
Increase, decrease, change and more
BMI, calorie, BMR and fitness tools
Add, subtract and find important dates
Length, weight, area and 100+ conversions
Most used calculators
Popular tools people use every day.
Estimate monthly payments, interest and amortization.
Check your body mass index and health range.
Calculate percentage, increase, decrease and more.
Plan your loan payments and see the complete breakdown.
Find your exact age in years, months and days.
Estimate your daily calorie needs and goals.
Calculate take-home pay, taxes and deductions.
Calculate your GPA and track your academic progress.
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Browse categories to find the right tool for your needs.
Grades, GPA and study planning tools.
- GPA Calculator
- Grade Calculator
- Final Grade Calculator
- Percentage Grade Calculator
- Time to Study Calculator
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Choose the Right Calculator
Not sure which tool fits? These quick comparisons help you decide.
Understand pay periods before comparing job offers.
Compare salary and hourly pay →Learn which calculation fits your savings or loan.
Understand interest calculations →Mortgage Calculator
Estimate your monthly mortgage payments, view total interest, and see a complete amortization schedule. Try it right here:
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How CalcFolk works
Get your answers in three simple steps.
Search or browse categories to find the right tool.
Input your numbers and adjust any settings.
See accurate results with clear explanations.
Helpful guides and resources
Learn with easy-to-follow guides, tips and examples.
Clear Calculations, Explained
Find tools for money, health, mathematics and practical tasks. Choose a category or search for a specific calculator to get started. Each tool explains its inputs, formulas and assumptions so you can understand the result. Financial estimates depend on the rates and settings you enter. Health estimates provide general information and are not a medical diagnosis.
About our calculation methods →Frequently asked questions
Quick answers to common questions.