50+ Free Online Calculators

EMI calculator, scientific calculator, age calculator, unit converters, and more. No sign-up. No limits. Just tools that work.

68 calculators across 9 categories

Calculator Categories

Math

Scientific calculator, percentage, fraction, average, and random number tools

10 tools

Math Solver

Step-by-step algebra, equation, calculus solver, and graphing calculator

3 tools

Unit Converters

Convert between length, weight, temperature, speed, data, volume, area, land, and cooking units

8 tools

Age & Date

Age calculator, days between dates, countdown timer, and date math tools

6 tools

Finance

EMI, loan, SIP, compound interest, mortgage, and tip calculators

16 tools

Tax & Salary

Income tax estimator, take-home salary, GST, and TDS calculators

4 tools

Business

Profit margin, markup, discount, break-even, ROI, and percentage change

9 tools

Education

GPA, CGPA, percentage to GPA, and grade converter calculators

7 tools

Developer

Programmer's calculator, epoch converter, and byte converter

5 tools

Popular Calculators

EMI Calculator

Calculate EMI for home loans, car loans, and personal loans with amortization schedule

Scientific Calculator

Full scientific calculator with trigonometry, logarithms, powers, and more

Age Calculator

Calculate exact age in years, months, and days from date of birth

Percentage Calculator

Calculate percentages, percentage change, and percentage of a number

Length Converter

Convert between meters, kilometers, miles, feet, inches, and more

SIP Calculator

Calculate returns on Systematic Investment Plan with growth chart

How to Use FreeCalcKit

Pick a calculator

Browse 9 categories in the sidebar or use the homepage to find your calculator.

Enter your values

Type your numbers into the input fields. Results update instantly as you type.

Copy or share

Click the copy button next to any result to copy it to your clipboard.

Use the sidebar for quick navigation

The sidebar groups all calculators by category. Click any category to expand it and jump to the calculator you need.

Dark mode for late-night calculations

Toggle dark mode from the header. Your preference is saved automatically across visits.

Bookmark your favorite calculator

Each calculator has its own URL. Bookmark it in your browser for instant access next time.

See full guide →

FAQ

Is FreeCalcKit really free?

Yes, 100% free. No sign-up, no feature limits, no hidden costs. All calculators run in your browser.

Is my data safe?

All calculations happen in your browser. We never upload, store, or share your data.

How many calculators are available?

FreeCalcKit includes 50+ calculators across 9 categories: math, finance, unit converters, age & date, tax, business, education, and developer tools.

Can I use this on mobile?

Yes. FreeCalcKit is fully responsive and works on phones, tablets, and desktops.