Free Online Tools & Calculators
Business Tools
Construction Calculators
Finance Calculators
Health Calculators
Math Tools
Everyday Tools
103Free tools
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Free Invoice GeneratorCreate professional invoices in seconds โ add your business details, line items, tax and…SIP CalculatorCalculate SIP returns โ see how monthly investments grow with compound returns over time.EMI / Loan CalculatorCalculate monthly loan payments (EMI), total interest and total payable for any loan.BMI CalculatorCheck your Body Mass Index and see which weight category you fall into.Age CalculatorFind your exact age in years, months and days from your date of birth.Love CalculatorJust for fun โ enter two names and discover your love compatibility score!
Business Tools
Construction Calculators
Concrete CalculatorEstimate concrete volume for slabs, footings and walls in cubic feet and cubic meters,… Paint CalculatorFind out how much paint you need โ enter wall dimensions and coats to… Tile CalculatorCalculate floor or wall tiles needed from room size and tile dimensions, including wastage. Brick CalculatorEstimate bricks, cement and sand for walls from length, height and wall thickness. Square Footage CalculatorCalculate the area of any room or plot in square feet and square meters… Mulch CalculatorCalculate mulch needed for garden beds in cubic yards and bags from area and… Gravel CalculatorEstimate gravel in cubic yards and tons for driveways, paths and landscaping. Asphalt CalculatorEstimate hot-mix asphalt tonnage for driveways and parking areas. Flooring CalculatorCalculate laminate or hardwood planks and boxes needed for any room. Drywall CalculatorFind how many 4ร8 drywall sheets you need for walls and ceilings. Wallpaper CalculatorCalculate wallpaper rolls needed from wall dimensions minus doors and windows. Fence CalculatorEstimate pickets, posts and rails for a wooden privacy fence. Deck Board CalculatorCalculate deck boards and fasteners for your deck build. Roofing Shingle CalculatorEstimate roofing squares and shingle bundles from roof size and pitch. Siding CalculatorEstimate siding squares needed for house walls minus openings.
Finance Calculators
EMI / Loan CalculatorCalculate monthly loan payments (EMI), total interest and total payable for any loan. Mortgage CalculatorPlan home financing โ enter property price, down payment, rate and years to see… Compound Interest CalculatorSee how your savings grow with compound interest over time. Simple Interest CalculatorCalculate simple interest and total amount for loans and deposits. Discount CalculatorFind sale prices fast โ enter the original price and discount percent. Salary CalculatorConvert between monthly, annual, weekly and daily salary in one click. SIP CalculatorCalculate SIP returns โ see how monthly investments grow with compound returns over time. SWP CalculatorPlan regular withdrawals from your investments โ see total withdrawn and remaining balance. FD CalculatorCalculate fixed deposit maturity value and interest earned for any tenure and rate. RD CalculatorFind the maturity value of a recurring deposit from monthly installments, rate and tenure. GST CalculatorAdd or remove GST from any amount โ instant GST breakup for billing and… Gratuity CalculatorEstimate your gratuity payout from basic salary and years of service. Retirement CalculatorFind out how much your monthly savings can grow into by retirement age. Home Loan EMI CalculatorCalculate monthly EMI, total interest and total cost of your home loan instantly. Auto Loan CalculatorPlan car financing โ enter vehicle price, down payment, rate and tenure for monthly… Personal Loan CalculatorCheck EMI and total interest for any personal loan before you borrow. ROI CalculatorMeasure return on investment as a percentage from amount invested and final value. Inflation CalculatorSee how inflation eats purchasing power โ project future costs of anything over time. CAGR CalculatorCompute Compound Annual Growth Rate from starting value, ending value and years. Tip CalculatorSplit restaurant bills fairly โ calculate tip, total and per-person share in seconds. Amortization CalculatorSee monthly payments plus a year-by-year principal vs interest breakdown. Future Value CalculatorProject what a lump sum grows to with compound interest. Present Value CalculatorFind what a future amount is worth in todayโs money. Savings Goal CalculatorFind the monthly saving needed to reach any money goal. Pay Raise CalculatorSee your new salary and annual increase from any raise percent. Salary to Hourly CalculatorConvert annual salary to hourly, weekly and monthly pay. Overtime Pay CalculatorCalculate overtime earnings at time-and-a-half rates. Sales Tax CalculatorAdd or remove sales tax from any price instantly. Margin CalculatorFind profit margin and markup from cost and selling price. Budget CalculatorList your expenses and see what is left of your income each month. Stock Average CalculatorAverage down correctly โ find your new average buy price. PayPal Fee CalculatorSee PayPal fees deducted and what you actually receive.
Health Calculators
BMI CalculatorCheck your Body Mass Index and see which weight category you fall into. Calorie (BMR) CalculatorEstimate daily calorie needs from age, gender, height, weight and activity level. Age CalculatorFind your exact age in years, months and days from your date of birth. Pregnancy CalculatorTrack pregnancy week by week โ enter LMP date to get due date, weeks… Ovulation CalculatorFind your fertile window, ovulation day and next expected period from cycle details. Body Fat CalculatorEstimate body fat percentage with the U.S. Navy tape-measure method. Ideal Weight CalculatorFind your healthy weight range from height and gender using standard formulas. Protein CalculatorFind your daily protein target from body weight and fitness goal. Water Intake CalculatorFind how much water you should drink daily based on weight and activity. Sleep CalculatorWake up refreshed โ find the best bedtimes based on 90-minute sleep cycles. TDEE CalculatorFind your Total Daily Energy Expenditure and calorie targets for cutting or bulking. Weight Loss CalculatorPlan safe weight loss โ daily calorie deficit from your goal and timeline. One Rep Max CalculatorEstimate your 1RM from any lift plus training percentages. Running Pace CalculatorConvert race time and distance to pace per km and speed. Calories Burned CalculatorEstimate calories burned for walking, running, cycling, swimming and lifting. Waist to Hip Ratio CalculatorCheck WHR and what it says about health risk. BAC CalculatorEstimate blood alcohol content from drinks, weight and time. For awareness only. Child Height PredictorPredict a childโs adult height from parentsโ heights.
Math Tools
Percentage CalculatorSolve any percentage problem โ what is X% of Y, X is what %… Basic CalculatorA clean online calculator for everyday arithmetic with keyboard support. Date Difference CalculatorCount days, weeks and months between any two dates. Scientific CalculatorAdvanced online scientific calculator โ trigonometry, logarithms, powers, roots and more. Fraction CalculatorAdd, subtract, multiply and divide fractions โ answers simplified automatically. Average CalculatorFind mean, median, mode, sum and range of any set of numbers instantly. Grade CalculatorConvert marks to percentage and letter grade in one click. Factorial CalculatorCompute n! instantly for any number from 0 to 170. Prime Number CheckerCheck if any number is prime and find its smallest factor. LCM CalculatorFind the least common multiple of two numbers. GCF CalculatorFind the greatest common factor of two numbers. Roman Numeral ConverterConvert numbers to Roman numerals and Roman numerals back to numbers. Binary ConverterConvert decimal numbers to binary and binary back to decimal. Quadratic Equation SolverSolve axยฒ + bx + c = 0 and see the discriminant and roots. Slope CalculatorFind the slope and equation of a line from two points. Circle CalculatorGet area, circumference and diameter from the radius of a circle. Triangle Area CalculatorCalculate the area of a triangle from base and height. Volume CalculatorFind the volume of a box, cylinder or sphere. Scientific Notation ConverterConvert numbers to scientific notation and back. Aspect Ratio CalculatorSimplify width:height to its simplest ratio like 16:9. Percentage Increase CalculatorFind the percent increase or decrease between two numbers. GPA CalculatorCalculate your GPA from course credits and letter grades. Ratio CalculatorSolve missing values in proportions and simplify any ratio.
Everyday Tools
Unit ConverterConvert length, weight and temperature units instantly โ feet to meters, kg to pounds… Random Number GeneratorGenerate random numbers between any minimum and maximum โ great for draws and games. Love CalculatorJust for fun โ enter two names and discover your love compatibility score! Password GeneratorCreate strong, random passwords โ choose length and character types. Generated privately in your… Dice RollerRoll virtual dice โ any number of dice with any number of sides, perfect… Fuel Cost CalculatorEstimate trip fuel cost from distance, mileage and fuel price โ plan road trips… Time Card CalculatorAdd up work hours from clock-in/out times, one per line. Time Duration CalculatorFind the exact duration between two times. Countdown TimerLive countdown to any date โ birthdays, exams, launches and events. Coin FlipFlip a virtual coin โ heads or tails with a running tally. Word CounterCount words, characters, sentences and reading time as you type. Random Name PickerPaste a list of names and pick a random winner for draws and teams. Shoe Size ConverterConvert shoe sizes between US, UK and EU systems. Day of the Week CalculatorFind what weekday any date falls on โ past or future.
Why use our tools?
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Instant results
No page reloads, no waiting โ every calculation happens live in your browser.
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Private by design
Your numbers and invoice data never leave your device. Nothing is uploaded.
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Free forever
Every tool is free with no signup, no watermarks and no limits.
Frequently asked questions
Are these tools really free?
Yes โ every calculator and the invoice generator are completely free, with no account needed.
Do I need to install anything?
No. All tools run right in your web browser on phone, tablet or desktop.
Is my data safe?
Yes. Calculations happen locally in your browser; we never see or store your inputs.
Can I use the invoice generator for my business?
Absolutely โ create unlimited professional invoices and save them as PDF for your records.