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Tip CalculatorCalculate the tip amount, total bill, and amount per person.Split Bill CalculatorSplit a shared bill fairly among a group, including tax, tip, and individual extras.Loan Comparison CalculatorCompare two loan offers by EMI, total interest, and total payment.EMI CalculatorCalculate monthly EMI, total interest, and total payment for a loan.Interest CalculatorCompare simple and compound interest on your savings or investment.GST CalculatorAdd or remove GST from an amount, with CGST/SGST split.Discount CalculatorFind the discount amount and final price on a sale item.Salary CalculatorConvert salary between yearly, monthly, weekly, daily, and hourly.Inflation CalculatorSee future cost and today's value of money under inflation.Interest Rate CalculatorFind the interest rate implied by principal, maturity amount, and time.Amortization CalculatorFull month-by-month loan EMI amortization schedule.SIP / Investment CalculatorEstimate SIP investment maturity value and returns.Income Tax CalculatorIllustrative India income tax estimate (New / Old regime).Fixed Deposit (FD) CalculatorCalculate FD maturity amount and interest earned.Down Payment CalculatorCalculate down payment and remaining loan amount.Debt-to-Income Ratio CalculatorCalculate your DTI ratio and loan-eligibility outlook.Present & Future Value CalculatorCalculate the present or future value of money.CAGR CalculatorCalculate the compound annual growth rate of an investment.ROI CalculatorCalculate return on investment and net gain or loss.Take-Home Salary CalculatorEstimate in-hand salary from CTC (India, New/Old regime).Credit Card Payoff CalculatorEstimate months and interest to pay off a credit card balance.Depreciation CalculatorCalculate asset depreciation with a year-by-year schedule.Margin CalculatorFind profit margin/markup, or the price for a target margin.Commission CalculatorCalculate sales commission and total earnings.Budget CalculatorPlan a monthly budget across editable expense categories.Home Loan EMI + Prepayment CalculatorCalculate home loan EMI and see interest/tenure saved with prepayments.Personal Loan EMI CalculatorCalculate EMI, total interest, and processing fee for a personal loan.Lumpsum CalculatorEstimate the future value of a one-time lumpsum investment.SWP CalculatorPlan a Systematic Withdrawal Plan and see how long your corpus lasts.RD CalculatorCalculate the maturity value of a Recurring Deposit (RD).PPF CalculatorEstimate PPF maturity value from yearly contribution and interest rate.NPS CalculatorEstimate NPS corpus at retirement, lump sum, and monthly pension.EPF CalculatorEstimate your EPF balance at retirement with salary increments.Gratuity CalculatorCalculate gratuity payable from last drawn salary and years of service.Retirement CalculatorEstimate your retirement corpus and the monthly SIP needed to reach it.XIRR CalculatorCalculate the annualized XIRR for a series of irregular cash flows.Old vs New Tax Regime CalculatorCompare income tax under the Old and New tax regimes side-by-side.HRA CalculatorCalculate your House Rent Allowance (HRA) tax exemption.TDS CalculatorCalculate TDS on interest, rent, professional fees, and other payments.Bonus CalculatorCalculate statutory bonus payable under the Payment of Bonus Act.Professional Tax CalculatorEstimate monthly professional tax deducted based on your state and salary.Break-Even CalculatorFind the break-even units and revenue from fixed costs, variable cost, and price.Business Loan EMI CalculatorCalculate EMI, total interest, and processing fee for a business loan.Invoice CalculatorCalculate invoice subtotal, discount, tax, and grand total from line items.

Sleep CalculatorFind the best bedtime or wake-up time based on 90-minute sleep cycles.BMI CalculatorCalculate your Body Mass Index and weight category.BMR & Calorie CalculatorEstimate your BMR and daily calorie needs (TDEE).Ideal Body Weight CalculatorFind your ideal body weight using the Devine formula.Pregnancy Due Date CalculatorEstimate your due date and current pregnancy week.Body Fat CalculatorEstimate body fat percentage using the US Navy method.Pace CalculatorCalculate running/walking pace and speed from distance and time.Pregnancy Conception CalculatorEstimate conception date from due date or last menstrual period.Lean Body Mass CalculatorEstimate lean body mass and fat mass using the Boer formula.Healthy Weight Range CalculatorFind your healthy weight range based on BMI 18.5-24.9.Calories Burned CalculatorCalculate calories burned during common activities.One Rep Max CalculatorEstimate your one-rep max lift using the Epley formula.Target Heart Rate CalculatorFind target heart rate training zones.Ovulation CalculatorEstimate your ovulation date and fertile window.Period CalculatorPredict your next upcoming period dates.Pregnancy Weight Gain CalculatorGet recommended total pregnancy weight gain based on pre-pregnancy BMI.Body Surface Area CalculatorCalculate Body Surface Area (BSA) using the Mosteller formula.Macro CalculatorSplit daily calories into protein, carb, and fat targets.Protein CalculatorCalculate your daily protein needs based on body weight and activity level.Water Intake CalculatorEstimate your daily water intake based on weight, exercise, and climate.Weight Loss CalculatorFind the daily calorie deficit needed to reach your goal weight.Weight Gain CalculatorFind the daily calorie surplus needed to reach your goal weight.BAC CalculatorEstimate blood alcohol content using the Widmark formula.GFR CalculatorEstimate kidney function (eGFR) and CKD stage.Atomic ElementLook up an element's atomic number, mass, category, period, and group.Drug CalculatorCalculate total drug dose from patient weight and a weight-based dose.MCG Minute CalculatorCalculate IV infusion rate (mL/hr) from a mcg/kg/min dose order.Drip Rate CalculatorCalculate gravity IV drip rate (gtt/min) from volume, time, and drop factor.

Math CalculatorPerform basic math operations like addition, subtraction, multiplication, etc.Percentage CalculatorCalculate percentages easily and quickly.CGPA to Percentage CalculatorConvert CGPA to an equivalent percentage.Percentage to CGPA CalculatorConvert a percentage of marks to an equivalent CGPA.Marks CalculatorCalculate total marks, percentage, and grade across multiple subjects.Average Marks CalculatorCalculate average marks and average percentage across multiple tests.Exam Percentage CalculatorCalculate exam percentage from marks obtained and total marks.Attendance CalculatorCalculate attendance percentage and check eligibility.Required Attendance CalculatorCalculate how many more classes are needed to reach a target attendance percentage.Study Time CalculatorCalculate total study hours available and hours per subject.Price CalculatorCalculate total price from a per-unit price and quantity.Decimal FormatterFormat numbers to a fixed decimal precision.Average CalculatorFind the mean, median, mode, min, max and sum of a list of numbers.LCM & GCD CalculatorCalculate the LCM and GCD of two or more integers.Fraction CalculatorAdd, subtract, multiply or divide fractions and simplify the result.Ratio SimplifierSimplify a ratio A:B to its lowest terms and decimal equivalent.Random Number GeneratorGenerate random integers within a range, with or without duplicates.GPA CalculatorCalculate weighted GPA from course grades and credit hours.Grade CalculatorCompute weighted final grade percentage and letter grade.Standard Deviation CalculatorCompute mean, variance, and standard deviation for a data set.Triangle CalculatorCompute a triangle's perimeter, area, and angles from its sides.Quadratic Formula CalculatorSolve ax²+bx+c=0 for real or complex roots.Exponent CalculatorRaise a base to any real exponent.Root CalculatorCompute the nth root of a number.Log CalculatorLog or natural log of a number in any base.Percent Error CalculatorPercent error between observed and true values.Rounding CalculatorRound to decimal places, nearest integer, or nearest multiple.Scientific Notation CalculatorConvert between standard and scientific notation.Factor CalculatorList all factors and the prime factorization of an integer.Binary Calculator (Arithmetic)Add, subtract, multiply, or divide two binary numbers.Hex CalculatorPerform arithmetic on hexadecimal numbers with decimal reference.Permutation & Combination CalculatorCalculate nPr permutations and nCr combinations for n and r.Z-Score CalculatorFind how many standard deviations a value is from the mean.Sample Size CalculatorDetermine the required survey/study sample size.Confidence Interval CalculatorCompute a confidence interval from sample mean, standard deviation, and size.Circle CalculatorFind radius, diameter, circumference, or area of a circle.Distance CalculatorCalculate distance between two 2D points.Slope CalculatorFind the slope and line equation between two points.Pythagorean Theorem CalculatorSolve for a side of a right triangle using a²+b²=c².Right Triangle CalculatorCompute hypotenuse, area, perimeter, and angles from two legs.Area Calculator (Shapes)Calculate the area of a square, rectangle, circle, triangle, or trapezoid.Volume Calculator (Shapes)Calculate the volume of a cube, box, sphere, cylinder, or cone.Surface Area CalculatorCalculate the surface area of a cube, box, sphere, cylinder, or cone.Scientific CalculatorTrigonometry, logarithms, exponents, and more, with calculation history.Molecular Weight CalculatorCalculate the molar mass of a chemical compound from its formula.

Countdown CalculatorSee how many days, hours, minutes, and seconds are left until any date.StopwatchTime anything precisely with start, pause, reset, and lap tracking.Working Days CalculatorCalculate the number of business days between two dates, excluding weekends.Date Difference CalculatorFind the difference between two dates in days, weeks, months, and years.Time Duration CalculatorCalculate time duration between two dates or times.Word CounterCount the number of words and characters in a text.Age CalculatorFind out your exact age in years, months, and days.Date and Day DisplayDisplay the current date and day of the week.Password GeneratorGenerate strong and secure passwords.Date CalculatorAdd or subtract years, months, and days from a date.Hours CalculatorCalculate hours worked between clock-in and clock-out, minus break.Time CalculatorAdd or subtract two time durations (hours/minutes/seconds).Text TransformerConvert text to uppercase, lowercase, title case, sentence case, or reverse it.IP CheckerInstantly find your public IP address.Remove Duplicate LinesRemove repeated lines from a block of text, keeping only the first occurrence.Text SorterSort lines of text alphabetically in ascending or descending order.Text FormatterClean up line breaks, blank lines, and paragraph formatting, or wrap text to a fixed width.Lorem Ipsum GeneratorGenerate placeholder Lorem Ipsum words, sentences, or paragraphs.Lakh to Crore ConverterConvert numbers between Lakh, Crore, and other Indian and international units.Indian Number SystemFormat a number using the Indian digit-grouping system (Lakh/Crore) and compare it with the international format.Number to WordsConvert a number into words using the Indian numbering system (Lakh, Crore, and beyond).Rupees to WordsConvert a rupee amount (with paise) into words, formatted the way it is conventionally written on a cheque.

Cement CalculatorCalculate cement bags, sand, and aggregate needed for a given concrete volume.Concrete CalculatorCalculate the volume of concrete needed for a slab, footing, or column.Brick CalculatorCalculate the number of bricks needed for a wall, with mortar allowance.Sand CalculatorCalculate the sand and cement needed for wall or ceiling plastering.Steel Weight CalculatorCalculate the weight of steel reinforcement bars from diameter and length.Tile CalculatorCalculate the number of floor or wall tiles needed, with wastage.Flooring CalculatorCalculate flooring area and estimated material cost, with wastage.Room Area CalculatorCalculate the floor area of one or more rooms and the total built-up area.Staircase CalculatorCalculate the number of risers, treads, and total run for a staircase.RCC CalculatorCalculate concrete volume and steel reinforcement weight for an RCC element.Construction Cost CalculatorEstimate total building construction cost from built-up area and rate.TMT Bar CalculatorCalculate the number of standard-length TMT bars needed for a steel requirement.Column CalculatorCalculate the concrete volume required for one or more RCC columns from width, depth, and height.Beam CalculatorCalculate the concrete volume required for one or more RCC beams from width, depth, and length.Footing CalculatorCalculate the concrete volume required for isolated, rectangular, or square footings.Construction Material EstimatorA complete project-level estimate of bricks, cement, sand, aggregate, and steel from built-up area and wall type.Construction Labour Cost CalculatorEstimate construction labour cost either per square foot or by number of workers, days, and daily wage.

Pipe Flow Rate CalculatorEstimate water flow rate through a pipe using the Hazen-Williams equation based on diameter, length, pressure, and material.Pipe Size CalculatorFind the recommended pipe diameter for a desired flow rate and velocity.Water Tank CalculatorCalculate the capacity of a rectangular or cylindrical water tank in litres and gallons.Plumbing Material CalculatorEstimate approximate pipe length, elbows, tees, and valves needed based on number of fixtures.Water Pressure CalculatorConvert water pressure between bar, psi, kPa, and metres/feet of water head.Water Flow CalculatorCalculate water flow rate from pipe diameter and flow velocity.Pipe Volume CalculatorCalculate the internal water volume held inside a pipe of a given diameter and length.Pipe Weight CalculatorEstimate the weight of a pipe based on its outer diameter, wall thickness, length, and material.Pipe Slope CalculatorCalculate the required fall (drop) of a pipe over a given length for a target slope percentage.Drainage Pipe Slope CalculatorGet the recommended drainage slope based on pipe diameter and calculate the required fall.Hot Water Pipe CalculatorSize a hot water pipe based on demand flow rate using a lower recommended velocity.Plumbing Cost CalculatorAdd your own materials, quantities, and rates plus labour cost to estimate total plumbing cost.Bathroom Plumbing Cost CalculatorEstimate the total plumbing cost for a bathroom based on fixture count, pipe length, and labour.Tap Flow CalculatorMeasure a tap's flow rate using the bucket-fill method - enter container volume and fill time.Water Head CalculatorCalculate total pump/tank head from elevation and friction loss, converted to pressure.Fitting Quantity CalculatorTally the number of elbows, tees, valves, and couplings needed based on your pipe layout.

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Health

Ovulation and Your Fertile Window: How the Dates Are Worked Out

Trying to conceive (or avoid it) starts with knowing when ovulation actually happens. Here's the calendar-based method and its limits.

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