Free Online Calculators & Converters
Fast, accurate calculators for finance, cooking, time, fitness, DIY, and AI.
Browse by Category
Choose from our collection of specialized calculators
Finance
Calculators for loans, mortgages, savings, and salary conversions
Cooking
Converters for ingredients, measurements, and recipe scaling
Time & Date
Tools for age, date differences, and time conversions
DIY & Home
Calculators for home improvement and construction projects
Fitness
Health and fitness calculators for BMI, calories, and more
AI & Tech
AI automation risk analysis and technology calculators
Popular Calculators
Most used tools by our community
Salary to Hourly
Convert annual salary to hourly rate
Loan Payment Calculator
Calculate monthly loan payments
Compound Interest
Calculate compound interest growth
BMI Calculator
Calculate your body mass index
Pan Size Converter
Convert baking pan sizes & adjust recipes
Grams ↔ Tablespoons
Bidirectional ingredient conversions
Cups to Grams
Convert cooking measurements
Age Calculator
Calculate exact age from birthdate
AI Job Risk
Analyze AI automation task exposure
Latest from the Blog
Guides, tips, and deep dives to help you make better decisions
2026 Tax Season Guide: Maximize Your Refund & Common Deductions
Tax season doesn't have to be stressful. Learn the common deductions you might be missing, how to calculate your taxable income, and everything you need to file your 2026 taxes confidently.
Cooking for Two on Valentine's Day: Complete Portion & Scaling Guide 2026
Most recipes serve 4-6 people, but you only need portions for two. Learn the exact formulas to scale any recipe, nail your portions, and cook a special meal without waste or confusion.
Are You Overtraining? The 4-Week Recovery Check-In (Why You're Exhausted After a Month)
Four weeks into your fitness journey and you're exhausted. You're not failing—you're overtraining. Learn how to adjust your plan, optimize recovery, and build sustainable progress that lasts beyond February.
Complete Guide to Calculating Macros for Any Goal in 2026
Stop guessing your macro split. Learn the exact formulas to calculate your protein, carbs, and fats based on your goals—whether you're building muscle, improving performance, or changing your body composition.
Lightning Fast
Instant calculations with no page reloads
100% Accurate
Verified formulas and precision calculations
Mobile Friendly
Works perfectly on all devices and screen sizes
How It Works
Get accurate results in three simple steps
Choose Your Calculator
Browse our categories or search for the specific calculator you need. From salary conversions to mortgage payments, we have you covered.
Enter Your Numbers
Input your values into the calculator. All calculations happen instantly in your browser—your data never leaves your device.
Get Instant Results
View your results immediately with detailed breakdowns, explanations, and helpful tips. No waiting, no sign-up required.
What Can You Calculate?
Popular searches and common use cases
Financial Planning
Health & Fitness
Why Choose Calcura for Your Calculations?
Calcura provides free, accurate, and easy-to-use online calculators for everyday needs. Whether you're managing finances, cooking a recipe, planning a project, or tracking your fitness goals, our calculators deliver instant, reliable results.
Privacy-First Calculator Tools
All calculations happen directly in your browser. We never store, collect, or share your data. Your financial information, personal details, and calculations remain completely private and secure on your device. No accounts, no tracking, no data harvesting.
Built with Industry-Standard Formulas
Every calculator on Calcura uses verified, well-documented formulas. Our compound interest calculator uses the standard A = P(1 + r/n)^(nt) formula. Our TDEE calculator uses the Mifflin-St Jeor equation. We show our work so you can trust the results.
Always Free, No Hidden Costs
Calcura is completely free with no premium tiers, subscription fees, or paywalls. Access all 65+ calculators anytime, anywhere, without creating an account or providing personal information.
More Than Just Numbers
Calculators are useful, but context matters. That's why we pair our tools with in-depth guides that explain the formulas, walk you through real scenarios, and help you actually understand your results. Whether it's figuring out how much house you can afford or getting kitchen measurements right, there's a guide for that.
Frequently Asked Questions
Are these calculators really free?▾
Yes, every calculator on Calcura is 100% free. There are no premium features, no sign-up walls, and no hidden costs. We support the site through non-intrusive ads.
Is my data safe?▾
All calculations run entirely in your browser. Your numbers never leave your device. We don't store, collect, or transmit any calculation data.
How accurate are the results?▾
We use industry-standard formulas for all calculations. Financial calculators use the same math as banks and financial advisors. Fitness calculators use peer-reviewed equations like Mifflin-St Jeor. Cooking converters use verified ingredient density data.
Do I need to create an account?▾
No. Every calculator works instantly without any sign-up, login, or personal information. Just open it and start calculating.
Can I use these calculators on my phone?▾
Yes. Every calculator is fully responsive and works on phones, tablets, and desktops. No app download needed—just open the site in any browser.