UtilityKit

500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.

Free Calculators — 70 Online Utilities

70 tools · Online Calculators

Free calculators for everyday decisions: finance (loan, mortgage, tip, tax), health (BMI, calories, BMR), math and percentages, time and date math, plus universal unit converters. Each tool shows its working so you can verify the result.

Finance · 12

Tip CalculatorSplit bills and calculate tipsCompound InterestCalculate compound interest growthLoan EMI CalculatorMonthly loan EMI and amortisationSalary CalculatorConvert salary between hourly, monthly, and yearlyInflation CalculatorCalculate the real value of money over time using historical CPI data — find …Mortgage Calculator with PMI & TaxFull monthly mortgage breakdown including PMI, property tax, insurance, and H…401(k) Retirement Savings ProjectionProject your 401(k) or retirement savings balance at retirement with employer…Auto Loan CalculatorCalculate monthly car payment, total interest, and amortization with trade-in…Savings Goal CalculatorCalculate the monthly contribution required to reach a savings goal with comp…FD CalculatorFixed deposit maturity, interest and post-tax yield (India)PPF CalculatorPublic Provident Fund maturity over 15+ years (India)HRA CalculatorHouse Rent Allowance exemption under §10(13A) (India)

Health & Fitness · 12

BMI CalculatorBody mass index calculatorPregnancy Due Date CalculatorEstimate baby due date from last menstrual period and typical cycle length us…TDEE CalculatorCalculate your Total Daily Energy Expenditure (TDEE) based on weight, height,…Macro CalculatorCalculate daily protein, carbohydrate, and fat targets based on your TDEE, go…Body Fat % Calculator (Navy Method)Estimate body fat percentage using the US Navy circumference measurement meth…Ideal Weight CalculatorCalculate ideal body weight using five established medical formulas (Hamwi, D…Heart Rate Zone Calculator (Karvonen)Calculate personalized heart rate training zones using the Karvonen formula b…Running Pace CalculatorCalculate running pace, finish time, or distance — enter any two values to fi…Ovulation CalculatorEstimate your fertile window and ovulation date based on your last menstrual …Water Intake CalculatorCalculate your recommended daily water intake based on body weight, activity …Lean Body Mass CalculatorEstimate lean body mass (LBM) using Boer, Hume, James, and Janmahasatian form…Calorie Deficit CalculatorCalculate the daily calorie target and timeline for safe, sustainable weight …

Math & Statistics · 4

Percentage CalculatorPercentage, increase and decrease calculationsPermutation & Combination CalculatorCalculate permutations P(n,r) and combinations C(n,r) for any values of n and…Quadratic Equation SolverSolve quadratic equations ax² + bx + c = 0 using the quadratic formula, showi…Prime Checker & FactorizationCheck whether a number is prime and find its prime factorization with a visua…

Time, Date & Age · 11

Age CalculatorCalculate exact age from birth dateDate DifferenceDays, months and years between two datesTime Zone ConverterConvert date and time between world time zonesTime Unit ConverterConvert durations among milliseconds, seconds, hours, days, weeks, and averag…Data Storage ConverterConvert bits and bytes with SI decimal prefixes or IEC binary kibibytes and t…Date CalculatorAdd or subtract days, weeks, months, or years from a start date.Business Days CalculatorCount weekdays between two calendar dates excluding weekends.Countdown TimerLive countdown toward a chosen datetime with shareable query hints.ISO Week CalculatorCompute ISO-8601 week numbers and week-years.Leap Year CheckerGregorian leap tests plus upcoming leap year hints.Stopwatch & TimerLap stopwatch plus countdown timer modes.

Conversion · 9

Unit ConverterConvert length, weight, temperature and moreBase ConverterConvert integers between binary, octal, decimal, and hexadecimal.Roman Numeral ConverterConvert integers to Roman numerals and Roman numerals back to integers with s…Pressure ConverterTranslate pascals, kilopascals, bar, PSI, atmospheres, and torr with SI-align…Energy ConverterSwap joules, calories, kilocalories, watt-hours, kilowatt-hours, and electron…Angle ConverterConvert degrees, radians, gradians, arcminutes, and arcseconds for trig and s…Fuel Economy ConverterSwap US MPG, imperial MPG, liters per 100 km, and kilometers per liter withou…Number to Words ConverterConvert any number to its English words representation — useful for checks, i…Words to Number ConverterConvert English number words (e.g. 'forty-two thousand' or 'three point five'…

More tools · 22

GST CalculatorAdd or remove GST from amountsDiscount CalculatorFind savings and final price after discountRatio CalculatorSimplify ratios and solve missing proportion valuesROI CalculatorCalculate return on investment and profitProfit Margin CalculatorCalculate gross margin, markup, and profitGPA CalculatorCompute weighted GPA from credit hours and letter grades on a 4.0 scale with …Work Hours CalculatorAdd daily clock-in and clock-out times minus breaks for total hours and decim…Sleep Cycle CalculatorCalculate optimal sleep and wake times based on 90-minute sleep cycles to wak…Triangle SolverSolve any triangle — find missing sides and angles from SSS, SAS, ASA, AAS, o…Circle CalculatorCalculate all circle properties — area, circumference, diameter, radius, arc …Fibonacci CalculatorCalculate Fibonacci numbers by index, find the index of a Fibonacci number, a…Statistics CalculatorCalculate descriptive statistics — mean, median, mode, standard deviation, va…Credit Card Payoff CalculatorCalculate how long it will take to pay off a credit card balance and the tota…SIP Calculator with ChartCalculate Systematic Investment Plan (SIP) returns with optional annual step-…Debt Snowball & Avalanche TrackerPlan debt payoff using the snowball (smallest balance first) or avalanche (hi…Amortization Schedule GeneratorGenerate a complete month-by-month amortization table for any loan with optio…Refinance CalculatorCompare your current loan to a refinance offer. See monthly savings, break-ev…Home Affordability CalculatorFind the maximum home price you can afford based on income, debts, down payme…RD CalculatorRecurring deposit maturity, interest and post-tax (India)Waist-to-Height Ratio CalculatorCalculate your waist-to-height ratio (WHtR) and check cardiometabolic risk ag…Waist-to-Hip Ratio CalculatorCalculate waist-to-hip ratio (WHR) and assess cardiovascular risk using WHO c…VO2 Max CalculatorEstimate VO2 max with Cooper, Rockport, or Bruce protocols and compare agains…