Free Online Calculators

Age calculator, BMI, EMI, GST, percentage and unit converter — fast, accurate, free calculators for everyday use.

✅ 99 free tools🔒 Files deleted in 2 hours⚡ Instant results📱 Works on mobile

All Calculators — 99 Free Tools

Calculate exact age from birthdate.

Calculate Body Mass Index and category.

Calculate loan EMI with full amortization.

Percentage Calculator

Calculate percentages, increases and decreases.

Calculate Indian GST inclusive and exclusive.

Convert length, weight, temperature, volume.

Compound Interest Calculator

Calculate compound interest with frequency options.

Date Difference Calculator

Calculate days between two dates.

Discount Calculator

Calculate sale price after discount.

Loan Calculator

Calculate EMI, total interest, and repayment.

Scientific Calculator

Advanced scientific calculator with trig functions.

Calculate tip amount and split bill by people.

Calorie Calculator

Calculate daily calorie needs using BMR & TDEE.

Random Number Generator

Generate random numbers in a given range.

Roman Numeral Converter

Convert between Roman numerals and regular numbers.

Number to Words

Convert numbers to English words.

Speed Distance Time Calculator

Calculate speed, distance, or time given two values.

Fuel Cost Calculator

Calculate the fuel cost for any trip.

Reading Time Calculator

Calculate how long it takes to read any text.

Date Calculator

Add or subtract days from a date. Find days between dates.

Time Zone Converter

Convert time between world time zones.

Percentage Change Calculator

Calculate percentage increase or decrease.

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and amortization.

Pregnancy Calculator

Calculate due date and trimester from your last period.

Body Fat Calculator

Estimate body fat percentage using the US Navy method.

Ideal Weight Calculator

Calculate your ideal body weight using multiple formulas.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

Water Intake Calculator

Calculate your daily recommended water intake.

Sleep Calculator

Find the best sleep and wake times based on sleep cycles.

Length Converter

Convert length units: mm, cm, m, km, in, ft, yd, mi.

Weight Converter

Convert weight units: mg, g, kg, oz, lb, stone.

Macro Calculator

Calculate daily protein, carbs, and fat macros for your goal.

Area Calculator

Calculate area of rectangle, circle, triangle, and square.

Waist Hip Ratio Calculator

Calculate WHR to assess health risk.

Calories Burned Calculator

Calculate calories burned during exercise.

Volume Calculator

Calculate volume of cube, box, sphere, cylinder, and cone.

Data Storage Converter

Convert data sizes: bytes, KB, MB, GB, TB, PB.

Ovulation Calculator

Find your ovulation date and fertile window.

Body Surface Area Calculator

Calculate body surface area using medical formulas.

Binary Calculator

Perform binary arithmetic and logic operations.

Fraction Calculator

Add, subtract, multiply, and divide fractions.

Calculate return on investment and annualized ROI.

Break-Even Calculator

Calculate break-even units and revenue for your business.

Statistics Calculator

Calculate mean, median, mode, standard deviation, and more.

Perform hexadecimal arithmetic and bitwise operations.

Markup Calculator

Calculate selling price, profit, and gross margin.

Profit Margin Calculator

Calculate gross profit and profit margin percentage.

Power Converter

Convert power units: W, kW, MW, HP, BTU/hr.

Savings Goal Calculator

Calculate monthly savings needed to reach a goal.

Pressure Converter

Convert pressure units: Pa, kPa, bar, atm, psi, mmHg.

Rule of 72 Calculator

Find how many years to double your investment.

Energy Converter

Convert energy units: J, kJ, cal, kcal, kWh, BTU.

CAGR Calculator

Calculate compound annual growth rate.

Scientific Notation Converter

Convert between decimal and scientific notation.

Roll any number of dice with any number of sides.

Number Base Converter (All)

Convert a number to binary, octal, decimal, and hex at once.

Flip a virtual coin and track heads/tails statistics.

Random Team Generator

Split a list of names into random balanced teams.

Lottery Odds Calculator

Calculate the odds of winning a lottery with any configuration.

Loan Amortization Calculator

Generate a full monthly loan amortization schedule.

GCD & LCM Calculator

Calculate the Greatest Common Divisor and Least Common Multiple.

Fibonacci Sequence Generator

Generate the Fibonacci number sequence up to 78 terms.

Prime Number Checker

Check if a number is prime and find its prime factors.

Factorial Calculator

Calculate N! for numbers up to 170.

Triangle Calculator

Calculate triangle area, perimeter, and angles from three sides.

Electricity Bill Calculator

Estimate your electricity bill from units, rate, and charges.

Calculate VAT inclusive and exclusive amounts.

Grade Calculator

Calculate grades and overall percentage for multiple subjects.

Work Hours Calculator

Track and calculate total work hours across multiple days.

Net Salary Calculator

Calculate take-home pay after Indian income tax and EPF.

Calorie Deficit Calculator

Calculate daily calorie deficit needed for weight loss.

Running Pace Calculator

Calculate running pace, finish time, or distance from any two values.

Calculate SIP mutual fund returns with compounding.

Blood Pressure Checker

Check your blood pressure category (normal, high, low).

Time Duration Calculator

Add or subtract time durations easily.

Debt Payoff Calculator

Calculate how long to pay off debt and total interest.

Investment Return Calculator

Calculate compound and simple interest investment returns.

Fixed Deposit Calculator

Calculate FD maturity amount with compound interest.

Stock Profit Calculator

Calculate profit or loss from stock trading.

Meeting Cost Calculator

Calculate the cost of a meeting based on salaries.

Calculate blood alcohol content using the Widmark formula.

Unit Price Calculator

Compare product prices by unit to find the best deal.

Scale recipe ingredients up or down for any number of servings.

Calculate pixels per inch (PPI) and screen display category.

Net Worth Calculator

Calculate your net worth from assets and liabilities.

Heart Rate Zone Calculator

Calculate training heart rate zones based on age and resting HR.

Daily Budget Calculator

Calculate your daily spending budget from income and expenses.

Age in Multiple Units

See your exact age in years, months, weeks, days, hours, and minutes.

Currency Converter

Convert between 20 major currencies using live or static rates.

Salary to Hourly Converter

Convert annual salary to hourly, daily, weekly, and monthly rates.

Retirement Calculator

Project your retirement balance with contributions and compound interest.

Inflation Calculator

Calculate future value of money adjusted for annual inflation rate.

Paycheck Calculator

Estimate take-home pay after federal, FICA, and state taxes.

Home Affordability Calculator

Calculate maximum home price using the 28% front-end DTI rule.

Macros Calculator

Calculate TDEE and daily macros using the Mifflin-St Jeor formula.

One-Rep Max Calculator

Estimate 1RM using Epley, Brzycki, and Lander formulas.

Protein Intake Calculator

Calculate daily protein needs based on weight, goal, and activity level.

Waist-Hip Ratio Calculator

Calculate WHR and health risk category based on WHO guidelines.

Live Currency Converter (166 Currencies)

Convert between 166 currencies with live exchange rates. Real-time data updated daily. Quick grid of popular currency rates.

What You Can Do with Calculators

✓Calculate exact age in years, months, days
✓BMI calculator with healthy range indicator
✓EMI calculator for home, car, and personal loans
✓GST calculator for inclusive and exclusive amounts
✓Percentage increase, decrease, and difference
✓Unit converter for length, weight, temperature, volume
✓Date difference calculator
✓Discount and sale price calculator

Who Uses Calculators?

🏦

Finance

Calculate loan EMI, interest, and repayment schedules

🛒

Shopping

Calculate discounts, GST, and final prices instantly

🏥

Health

Track BMI and healthy weight ranges

🌏

Travel

Convert units, currencies, and measurements

About Calculators

Everyday calculations shouldn't require complicated spreadsheets or expensive apps. ToolNest's calculator suite covers the most common calculation needs — from figuring out your exact age in days, to calculating loan EMI payments, to converting units for cooking or travel.

All calculators work instantly in your browser with no signup required, giving you fast, accurate results every time.

Frequently Asked Questions about Calculators

Are the calculations accurate?

Yes. All calculators use standard formulas and are verified for accuracy. EMI calculations use the standard P × r × (1+r)^n / ((1+r)^n - 1) formula.

Do calculators require internet?

Once the page loads, all calculations happen instantly in your browser with no server calls needed.