CCalculate.Studio
393 free calculators · 15 languages · Always free

Every calculator you need, all in one place

From mortgage repayments and compound interest to BMI, percentages, concrete volume and calculus — 393 free calculators spanning finance, health, fitness, math, construction, home and everyday life. Every result shows the formula behind it and cites its source, works in metric or imperial units, and runs instantly in your browser. No signup, no clutter, completely private.

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Money & Finance

Mortgage, loans, investing, tax

161 free calculators

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Health

BMI, calories, pregnancy, heart

25 free calculators

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Fitness

Pace, power, strength, TDEE

20 free calculators

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Education & Math

Percentages, statistics, algebra, GPA

57 free calculators

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Home Improvement

Paint, tile, flooring, energy

12 free calculators

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Construction

Concrete, brick, gravel, asphalt

76 free calculators

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Automotive

Fuel cost, economy, tire size

3 free calculators

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Technology

Download time, subnets, binary

6 free calculators

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Engineering

Ohm's law, voltage drop, torque

12 free calculators

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Cooking & Baking

Cups to grams, dough, coffee

5 free calculators

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Everyday Tools

Age, dates, time zones, tips

16 free calculators

Popular calculators

🏠Mortgage CalculatorCalculate your monthly mortgage payment, total interest paid and loan amount using standard amortization. Includes the 28/36 affordability rule.⚖️BMI CalculatorCalculate your Body Mass Index instantly with WHO classification and NHS ethnicity-adjusted thresholds. Metric & imperial, healthy weight range included.💳Loan CalculatorCalculate the monthly payment, total paid, and total interest for any amortizing loan. Enter amount, annual rate, and term in months.🎂Age CalculatorCalculate your exact age in years, months and days from your date of birth, plus total days, weeks, months lived and days until your next birthday.％Percentage CalculatorCalculate percentages three ways: find a percent of a number, find what percent one number is of another, or calculate percent change between two values.📈Compound Interest CalculatorCalculate compound interest with A = P(1+r/n)^nt. Choose annual, quarterly, monthly or daily compounding. Includes Rule of 72 doubling-time estimate.🍎Calorie CalculatorCalculate daily calories to maintain, lose or gain weight using the Mifflin-St Jeor equation, activity multipliers and safe minimum-calorie floors.🎓GPA CalculatorCalculate your GPA on the 4.0 scale with credit weighting: quality points, total credits and a letter-grade conversion table for the common US convention.🌴Retirement CalculatorEstimate your retirement nest egg using compound growth and the Bengen 4% safe-withdrawal rule. See projected monthly income in today's dollars.🤰Pregnancy Due Date CalculatorEstimate your pregnancy due date from your last menstrual period, conception date, or IVF transfer using ACOG Naegele's Rule and ASRM conventions. Free tool.🏛️Tax CalculatorEstimate income tax using US 2025 federal brackets or UK 2025-26 bands. See tax due, after-tax income, and effective rate. Educational reference only.⚡TDEE CalculatorCalculate your Total Daily Energy Expenditure with the Mifflin-St Jeor equation and standard activity multipliers. Maintenance, loss and gain estimates.

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Health

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Education & Math

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Engineering

Cooking & Baking

Everyday Tools

Calculate.Studio — 393 Free Online Calculators for Finance, Health, Math & More

From mortgage repayments and compound interest to BMI, percentages, concrete volume and calculus — 393 free calculators spanning finance, health, fitness, math, construction, home and everyday life. Every result shows the formula behind it and cites its source, works in metric or imperial units, and runs instantly in your browser. No signup, no clutter, completely private.

Money & Finance: Loan, savings, investing and planning calculators using standard amortization mathematics, transparent assumptions and cited conventions.

Health: Body composition, nutrition, pregnancy and heart-health calculators based on WHO, NHS, ACOG and ACSM reference standards.

Fitness: Training calculators for runners, cyclists, swimmers and lifters — validated formulas from sports science literature.

Education & Math: Math and statistics calculators with step-by-step formulas and worked examples for students and professionals.

Home Improvement: Project estimation calculators with industry-typical coverage values you can adjust to your materials.

Construction: Material quantity calculators using standard densities and coverage rates, with sensible waste margins.

Automotive: Driving-cost and fitment calculators with metric and imperial unit conversions built in.

Technology: Data, networking and number-system calculators for developers, admins and students.

Engineering: Electrical and mechanical engineering calculators using standard physical constants, cited on every page.

Cooking & Baking: Kitchen conversion calculators built on published ingredient densities and baker's percentages.

Everyday Tools: Quick daily-life calculators: dates, times, travel budgets, tips and currency conversions.

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