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EMI, SIP, GST, income tax, BMI, age, percentage, currency and 74+ more free calculators. Every answer shows its formula, and nothing you type leaves your browser.
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EMI CalculatorEnter the loan amount, interest rate and tenure to see your monthly EMI, total interest payable and a year-by-year repayment schedule.Home Loan EMI CalculatorHousing loan EMI with prepayment, LTV and tax benefitCar Loan EMI CalculatorCar EMI from on-road price, down payment and tenurePersonal Loan EMI CalculatorPersonal loan EMI, processing fee and effective rateLoan CalculatorSolve for EMI, loan amount or tenure, with extra paymentsMortgage CalculatorMonthly mortgage payment with tax, insurance and PMISIP CalculatorEstimate the future value of your monthly mutual fund SIP.Step Up SIP CalculatorSee how a yearly SIP increase grows your mutual fund corpus.Lumpsum CalculatorFind the future value of a one-time mutual fund investment.SWP CalculatorPlan a monthly income from your mutual fund corpus.PPF CalculatorFind your PPF maturity amount and yearly interest.FD CalculatorFind your fixed deposit maturity amount and interest.RD CalculatorFind the maturity value of your monthly recurring deposit.Compound Interest CalculatorGrowth with any compounding and monthly contributionsSimple Interest CalculatorSimple interest for years, months, days or date rangesGST CalculatorAdd or remove GST and see the CGST, SGST or IGST split.Income Tax CalculatorCompare old vs new regime tax for FY 2026-27 and see which saves more.Salary CalculatorConvert CTC to monthly in-hand salary after PF and income tax.HRA CalculatorFind your tax-free HRA exemption and taxable HRA.Gratuity CalculatorWork out your gratuity with the 15/26 formula and tax-free limit.EPF CalculatorEstimate your PF corpus at retirement at 8.25% interest.NPS CalculatorEstimate your NPS corpus, lump sum and monthly pension.Sukanya Samriddhi Yojana CalculatorFind the SSY maturity amount for your daughter at 8.2%.CAGR CalculatorFind the compound annual growth rate between two values.ROI CalculatorReturn on investment, annualized ROI and loan ROI from EMIInflation CalculatorFuture cost, purchasing power and past value of moneyRetirement CalculatorFind your retirement corpus and the monthly saving needed.Discount CalculatorFind the sale price, savings and discount percentage in seconds.Profit Margin CalculatorGet profit, margin % and markup %, or the price for a target margin.Sales Tax CalculatorAdd sales tax to a price or work it backwards from a total.Tip CalculatorWork out the tip and split the bill between people.BMI CalculatorCheck your body mass index, category and healthy weight range.BMR CalculatorFind the calories your body burns at rest, and your daily needs.Calorie CalculatorHow many calories to eat a day to lose, keep or gain weight.TDEE CalculatorFind how many calories you burn in a day, and your targets.Body Fat CalculatorEstimate body fat % with the US Navy tape-measure method.Ideal Weight CalculatorIdeal body weight by height with 4 formulas and BMI range.Macro CalculatorDaily protein, carbs and fat grams for your goal.Protein CalculatorDaily protein grams by body weight, activity and goal.Water Intake CalculatorDaily water in litres by weight, exercise and climate.Pregnancy Due Date CalculatorDue date, current week and milestones from LMP or conception.Ovulation CalculatorOvulation day and fertile window for the next 3 cycles.Period CalculatorNext 6 period dates with ovulation and fertile days.Heart Rate CalculatorMax heart rate and Karvonen training zones by age.Calories Burned CalculatorCalories burned for 25+ activities by weight and time.Percentage CalculatorX% of Y, percentage of marks, % increase and decreasePercentage Change CalculatorPercentage increase or decrease between two numbersScientific CalculatorTrig, log, powers, roots and factorial with historyFraction CalculatorAdd, subtract, multiply, divide fractions and mixed numbersAverage CalculatorMean, median, mode and weighted average of any listStandard Deviation CalculatorSample and population SD, variance and mean with stepsRatio CalculatorSimplify ratios, solve proportions, split amountsLCM and GCD CalculatorLCM and GCD/HCF of any numbers with factor stepsQuadratic Equation CalculatorSolve ax² + bx + c = 0 with steps, discriminant and vertex.Area CalculatorArea of any shape or plot in sq ft, sq m, acres and hectares.Volume CalculatorVolume of tanks, boxes and solids in litres, m³ and cubic feet.Pythagorean Theorem CalculatorFind the hypotenuse or a missing side of a right triangle.Square Root CalculatorSquare, cube and nth roots with simplified radical form.Exponent CalculatorWork out xʸ for any base and power, with steps.Log CalculatorLogarithm in base 10, e, 2 or any base, plus antilog.Random Number GeneratorPick random numbers in any range, with or without repeats.Prime Number CalculatorCheck primes, factorise numbers and list primes in a range.Age CalculatorExact age from date of birth in years, months and daysDate CalculatorDays between two dates, or add and subtract days from a dateTime CalculatorAdd or subtract hours, minutes and secondsHours CalculatorWork hours between two times, minus breaks, with payGPA CalculatorSemester and cumulative GPA from grades and creditsCGPA to Percentage CalculatorConvert CGPA to percentage with your university's formulaGrade CalculatorWeighted course grade or the final exam score you needFuel Cost CalculatorPetrol, diesel or CNG cost of any trip, per km and per person.Electricity Bill CalculatorMonthly bill from units or appliances, with editable slab rates.Unit ConverterLength, weight, area, temperature, volume, speed and 4 more.Speed Distance Time CalculatorSolve for speed, distance or time in km/h, mph, m/s or knots.Roman Numeral ConverterNumbers and dates to Roman numerals and back, 1 to 3999.Binary CalculatorBinary arithmetic plus binary, decimal, hex and octal conversion.Love CalculatorA just-for-fun love percentage and FLAMES result from two names.Currency ConverterLive rates for USD, INR, AED, EUR, GBP and 35 more currencies.Time Zone ConverterConvert IST, EST, PST, GMT and 50 zones with DST handled.Color PickerHEX, RGB, HSL, CMYK codes, palettes and contrast checks.Password GeneratorStrong random passwords or word passphrases, with entropy.Dice RollerRoll 1–10 dice: d6 with dots, d20, d100 and more.Spin the WheelRandom name picker wheel for names, numbers and choices.
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Every calculator explains its formula with a worked example, so you can check the answer yourself.
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Made for India
Lakh and crore formatting, current tax slabs, GST, PPF, EPF and SSY rules – plus $, €, £ when you need them.
Free online calculators for every everyday sum
CodingMarble Calculator is a collection of free online calculators for money, health, maths and daily life. Work out a loan EMI, plan a SIP or FD, get income tax and GST figures, check your BMI and daily calories, solve percentages and fractions, convert currency and units, or find your exact age – all on one fast website that works on your phone.
Accurate formulas, explained
Finance calculators follow the formulas banks and fund houses use; health calculators use standard equations such as Mifflin-St Jeor and the WHO BMI ranges. Each page has a formula, a worked example and answers to common questions.
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