Free Online Calculators for Finance, Health & Math
Your one-stop destination for free online calculators in finance, health, and math.
🔥 Trusted by millions worldwide • 🚀 100% Free • ⚡ Instant Results
🔥 Most Popular Calculators
Stock Investment Calculator
Calculate stock value, profit, loss, ROI, and annualized return for US stocks.
📊 Explore Our Calculator Categories
💰 Financial Calculators
Calculate loans, mortgages, investments, and more.
- Advanced Mortgage Calculator
- US Mortgage Calculators (All States)
- Canada Mortgage Calculators
- Loan Calculator
- Auto Loan Calculator
- Stock Investment Calculator
- Investment Calculator
- Interest Calculator
- Payment Calculator
- Retirement Calculator
- Amortization Calculator
- Inflation Calculator
- Finance Calculator
- Income Tax Calculator
- Compound Interest Calculator
- Salary Calculator
- Interest Rate Calculator
- Sales Tax Calculator
🏥 Health Calculators
Calculate BMI, calorie intake, and other health metrics.
- BMI Calculator
- BMR Calculator
- Body Fat Calculator
- Blood Pressure Calculator
- Calorie Calculator
- Calorie Deficit Calculator
- Heart Rate Zone Calculator
- Ideal Weight Calculator
- Lean Body Mass Calculator
- Macronutrient Calculator
- One Rep Max Calculator
- Pregnancy Due Date Calculator
- Protein Intake Calculator
- Sleep Calculator
- Target Heart Rate Calculator
- VO2 Max Calculator
- Waist-to-Hip Ratio Calculator
- Water Intake Calculator
🧮 Math Calculators
Perform complex math calculations with ease.
- Scientific Calculator
- Fraction Calculator
- Percentage Calculator
- Area Calculator
- Volume Calculator
- Arithmetic Mean Calculator
- Binary Calculator
- Decimal to Fraction Calculator
- Mixed Fraction Calculator
- Geometry Calculator
- GCD Calculator
- LCM Calculator
- Prime Factorization Calculator
- Logarithm Calculator
- Factorial Calculator
- Combination Calculator
- Permutation Calculator
- Probability Calculator
- Random Number Generator
🔄 Unit Converters
Convert between metric and imperial units for weight, length, temperature, area, fuel efficiency, and more.
- Weight Converter
- Length Converter
- Temperature Converter
- Area Converter
- Volume Converter
- Speed Converter
- Energy Converter
- Power Converter
- Pressure Converter
- Digital Storage Converter
- Fuel Efficiency Converter
- Angle Converter
⏱️ Tools
Handy online tools for time management and productivity.
- Spin Wheel
- Online Stopwatch
- 5 Minute Timer
- 1 Minute Timer
- 10 Minute Timer
- 15 Minute Timer
- 20 Minute Timer
- 30 Minute Timer
💬 What Our Users Say
"ManyCalcs has simplified my financial planning. The mortgage calculator is a lifesaver!"
Sarah L.Finance Blogger
"I love the health calculators. Tracking my BMI and calorie intake has never been easier."
John D.Fitness Enthusiast
"The math calculators are perfect for my studies. Highly recommend ManyCalcs!"
Emily R.Math Student
🌟 Why Choose ManyCalcs?
100% Free
No subscriptions, no hidden fees. All calculators are completely free.
Instant Results
Get accurate calculations instantly without waiting or delays.
Mobile Friendly
Works perfectly on all devices - desktop, tablet, and mobile.
Private & Secure
Your data stays private. We don't store any calculation data.