🧮 64+ Free Tools
Free Online Calculator Tools
EMI, SIP, BMI, GST, mortgage, tax, health, math and 50+ more calculators. Instant results. No sign-up required.
Finance Calculators28 tools
EMI Calculator
Monthly loan installment with amortization
🔥 Popular
SIP Calculator
Mutual fund SIP returns & step-up option
Finance
Compound Interest
Investment growth with year-by-year
Finance
GST Calculator
Add/remove GST (5%,12%,18%,28%)
🔥 Popular
Percentage Calculator
Percentage change, increase, decrease
Math
Discount Calculator
Sale price, amount saved, discount %
🔥 Popular
Tip Calculator
Split bill and tip amount
Finance
Investment Calculator
Calculate future value of investments
Finance
FD Calculator
Fixed deposit maturity & interest
Finance
RD Calculator
Recurring deposit maturity amount
Finance
PPF Calculator
Public Provident Fund returns
Finance
PF Calculator
Provident fund maturity amount
Finance
NPS Calculator
National Pension Scheme returns
Finance
Mutual Fund Calculator
Lump sum & SIP returns
Finance
CAGR Calculator
Compound annual growth rate
Finance
Break-even Calculator
Break-even point for business
Finance
Mortgage Calculator
Monthly mortgage payment & interest
Finance
Amortization Calculator
Loan amortization schedule
Finance
Refinance Calculator
Savings from loan refinancing
Finance
Buy vs Rent Calculator
Compare buying vs renting
Finance
Salary Calculator
Take-home salary & deductions
Finance
Income Tax Calculator
Income tax liability (India)
🔥 Popular
HRA Calculator
House Rent Allowance exemption
Finance
Gratuity Calculator
Gratuity amount for employees
Finance
Savings Goal Calculator
Plan savings to reach a goal
Finance
ROI Calculator
Return on investment
Finance
Currency Converter
Live currency exchange rates
Finance
EPF Calculator
Employee Provident Fund maturity
Finance
Health & Fitness14 tools
BMI Calculator
Body mass index & weight category
Health
Body Fat Calculator
Estimate body fat percentage
Health
Calorie Calculator
Daily calorie needs
Health
Macro Calculator
Protein, fat, carbs intake
Health
Cholesterol Calculator
Cholesterol risk assessment
Health
Water Intake Calculator
Daily water requirement
Health
Heart Rate Zones
Target heart rate zones
Health
Sleep Cycle
Optimal sleep schedule
Health
Due Date Calculator
Pregnancy due date & trimester
Health
Running Pace
Pace, time & distance
Fitness
Study Hour
Study time planning
Education
Stopwatch Timer
Online stopwatch & countdown
Utility
TDEE Calculator
Total Daily Energy Expenditure
Health
Calorie Deficit
Weight loss calorie target
Health
Date & Time4 tools
Education & GPA5 tools
Math & Algebra13 tools
Percentage Calculator
Percentage of any number
Math
Exponent Calculator
Power & exponent calculations
Math
Log Calculator
Logarithm (log, ln)
Math
Quadratic Formula
Solve quadratic equations
Math
Slope Calculator
Slope of a line
Math
Standard Deviation
SD & variance
Stats
Random Number
Generate random numbers
Math
Ratio Calculator
Simplify & compare ratios
Math
Triangle Calculator
Area, angles & sides
Geometry
Volume Calculator
Volume of 3D shapes
Geometry
Distance Calculator
Distance between points
Geometry
Hex Calculator
Hexadecimal operations
Math
Root Calculator
Square, cube, nth root
Math
Science & Engineering7 tools
Utility & Misc7 tools
Unit Converter
Length, weight, temperature, etc.
Utility
Speed Calculator
Distance, time, speed
Math
Fraction Calculator
Add, subtract, multiply fractions
Math
Dividend Calculator
Dividend income & yield
Finance
Loan Eligibility
How much loan you can get
Finance
Investment Return
ROI & CAGR
Finance
Age Difference (exact)
Precise age gap
Date
Why choose ToolsBox calculators?
🔢 100% free & no sign-up All calculators are completely free, no registration or hidden fees.
⚡ Instant results Real-time calculations as you type – no page reloads.
📱 Works on all devices Fully responsive design – desktop, tablet, mobile.
🔒 Privacy first No data is stored on our servers. Everything runs in your browser.
🌍 Global & local support Tools work for any currency, unit, or tax regime – including India.
📚 64+ tools & growing New calculators added regularly based on user requests.
How to use our calculators
Using any tool is simple: select a calculator from the categories above, enter your numbers in the input fields, and get instant results. Most calculators also allow you to copy the result with one click. For financial calculators like EMI, SIP, or income tax, you can adjust sliders or input precise values – the output updates automatically.
Popular calculator categories
🔹 Finance: Plan loans, investments, retirement, and taxes.
🔹 Health: Track BMI, calorie intake, body fat, and fitness goals.
🔹 Math & Algebra: Solve equations, compute percentages, statistics.
🔹 Education: Calculate GPA, CGPA, grades, and study time.
🔹 Date & Time: Find age, date differences, and time conversions.
🔹 Science & Engineering: Bandwidth, half‑life, IP info, and more.
Frequently asked questions
Are these calculators really free? +
Yes, every tool on ToolsBox is completely free. No premium tiers, no hidden charges, no sign‑up required.
Do I need to download anything? +
No. All calculators run directly in your browser – no software installation or plugins needed.
Are the results accurate? +
Yes, our calculators use standard mathematical and financial formulas. For tax calculators, we follow the latest official rules (e.g., Indian income tax slabs).
How often are new calculators added? +
We add new tools every week. If you need a specific calculator, contact us and we’ll prioritise it.
About ToolsBox – We are a small team dedicated to building high‑quality, free online tools for everyday use. Started in 2026, ToolsBox already serves thousands of users worldwide. Learn more about us →