Free Calculators — 101 Online Utilities
101 tools · Online Calculators
Free calculators for school, money, health, home projects and everyday time math. The math tools show their working: fractions, factors, LCM and GCF, long division, square roots, the unit circle and a printable multiplication chart. Grade, final grade and GPA calculators cover school; finance, health, construction, date and unit conversion calculators cover the rest. Every calculator runs in your browser.
Grades & School · 3
Finance · 24
🔧Tip CalculatorSplit bills and calculate tips🔧Compound InterestCalculate compound interest growth🔧Loan EMI CalculatorMonthly loan EMI and amortisation🔧GST CalculatorAdd or remove GST from amounts🔧Discount CalculatorFind savings and final price after discount🔧ROI CalculatorCalculate return on investment and profit🔧Salary to Hourly CalculatorConvert salary between hourly, monthly, and yearly🔧Profit Margin CalculatorCalculate gross margin, markup, and profit💳Credit Card Payoff CalculatorCalculate how long it will take to pay off a credit card balance at a fixed m…📈Inflation 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…📈SIP Calculator with ChartCalculate Systematic Investment Plan (SIP) returns with optional annual step-…🏦401(k) CalculatorProject your 401(k) or retirement savings balance at retirement with employer…❄️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…🚗Auto Loan CalculatorCalculate monthly car payment, total interest, and amortization with trade-in…🔁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…🎯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)🔧RD CalculatorRecurring deposit maturity, interest and post-tax (India)💵Money CounterCount US cash by bills, coins and coin rolls, with subtotals, a grand total a…
Health & Fitness · 17
🔧BMI CalculatorBody mass index calculator🔧Pregnancy 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 from your TDEE, a cut/…📏Body Fat % Calculator (Navy Method)Estimate body fat percentage using the US Navy circumference measurement meth…⚖️Ideal Weight CalculatorCalculate ideal body weight with four clinical formulas (Hamwi, Devine, Robin…❤️Heart Rate Zone Calculator (Karvonen)Calculate personalized heart rate training zones with the Karvonen formula fr…🏃Running Pace CalculatorCalculate running pace, finish time, or distance — enter any two values to fi…😴Sleep Cycle CalculatorCalculate optimal sleep and wake times based on 90-minute sleep cycles to wak…🌸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 …📏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…💪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 …🏃VO2 Max CalculatorEstimate VO2 max with Cooper, Rockport, or Bruce protocols and compare agains…🏋One Rep Max CalculatorEstimate your one-rep max from a submaximal set with the Epley and Brzycki fo…
Home & Construction · 6
⬚Square Footage CalculatorCalculate square feet for rooms, floors and yards, total several areas and es…⬛Cubic Feet CalculatorCalculate cubic feet for boxes, rooms and cylinders and convert to other volu…⛏Cubic Yard CalculatorWork out cubic yards of concrete, mulch, soil or sand from length, width and …🪨Gravel CalculatorEstimate gravel in tons and cubic yards from area, depth and density, with cost.📐Area CalculatorFind the area of eight common shapes from measurements in mm, cm, m, in, ft o…🌿Mulch CalculatorWork out how much mulch your garden beds need in cubic yards and 2 or 3 cu ft…
Math & Science · 30
🔧Percentage CalculatorPercentage, increase and decrease calculations🔧Ratio CalculatorSimplify ratios and solve missing proportion values🔧Base ConverterConvert integers between binary, octal, decimal, and hexadecimal.🔧Roman Numerals Chart & ConverterConvert integers to Roman numerals and Roman numerals back to integers with s…🎲Permutation & Combination CalculatorCalculate permutations P(n,r) and combinations C(n,r) for n up to 170 with th…📐Quadratic Formula CalculatorSolve quadratic equations ax² + bx + c = 0 using the quadratic formula, showi…LCMLCM CalculatorFind the least common multiple of two or more whole numbers, with prime facto…GCFGCF CalculatorFind the greatest common factor (GCD) of two or more numbers with Euclidean a…△Triangle SolverSolve a triangle — find missing sides and angles from SSS, SAS, ASA, or AAS i…◺Pythagorean Theorem CalculatorFind the missing side of a right triangle from the other two sides using a² +…×10ⁿScientific Notation CalculatorConvert numbers to scientific, E and engineering notation and do arithmetic i…÷Long Division CalculatorDivide whole numbers with the full long division working, remainder and decim…⭕Circle CalculatorCalculate all circle properties — area, circumference, diameter, radius, arc …🔢Prime Checker & FactorizationCheck whether a number is prime and find its prime factorization, divisors, a…🌀Fibonacci CalculatorCalculate any Fibonacci number F(n) up to n = 10,000 with exact BigInt digits…📊Statistics CalculatorCalculate descriptive statistics — mean, median, mode, standard deviation, va…🔢Number to Words ConverterConvert numbers to English words in standard, ordinal, US dollar currency, or…✏️Words to Number ConverterConvert English number words (e.g. 'two million forty-two thousand') back to …🧮Factor CalculatorList every factor of a whole number up to one trillion, with factor pairs, th…🔲Square Root CalculatorFind square roots, cube roots and nth roots to 10 significant digits, check p…🧪Molarity CalculatorSolve for molarity, mass, volume or molar mass, plan C1V1 = C2V2 dilutions, a…🎲Probability CalculatorCalculate probabilities for two independent events, conditional probability P…↔️Percentage Difference CalculatorFind the percent difference between two numbers, plus the percent change from…📍Midpoint CalculatorFind the midpoint of two points in 2D or 3D with the formula worked out, plus…📐Unit CircleInteractive unit circle chart with exact sin, cos and tan values for all 16 s…✖️Multiplication ChartInteractive multiplication chart from 1–10 to 1–20 or any size up to 30, with…🔲Perfect SquaresCheck whether a number up to 10¹⁵ is a perfect square or cube, and list the p…🔢Decimal to Fraction CalculatorConvert a decimal or repeating decimal to a fraction in lowest terms and a mi…➗Fraction to Decimal CalculatorConvert a fraction or mixed number to an exact decimal with the repeating dig…🧮Fraction CalculatorAdd, subtract, multiply or divide fractions, mixed numbers, whole numbers and…
Time, Date & Age · 10
🔧Age CalculatorCalculate exact age from birth date🔧Days Between DatesDays, months and years between two dates🔧Time Card CalculatorAdd daily clock-in and clock-out times minus breaks for total hours and decim…🔧Time Unit ConverterConvert durations among milliseconds, seconds, hours, days, weeks, and averag…🔧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.🔧Week Number CalculatorCompute ISO-8601 week numbers and week-years.🔧Next Leap Year CheckerGregorian leap tests plus upcoming leap year hints.🔧Stopwatch & TimerLap stopwatch plus countdown timer modes.
Conversion · 7
🔧Unit ConverterConvert length, weight, temperature and more🔧Time Zone ConverterConvert date and time between world time zones🔧Pressure ConverterTranslate pascals, kilopascals, bar, PSI, atmospheres, and torr with SI-align…🔧Energy ConverterSwap joules, calories, kilocalories, watt-hours, kilowatt-hours, and electron…🔧Degrees to Radians ConverterConvert degrees, radians, gradians, arcminutes, and arcseconds for trig and s…🔧MPG to L/100km ConverterSwap US MPG, imperial MPG, liters per 100 km, and kilometers per liter withou…🔧GB to GiB ConverterConvert bits and bytes with SI decimal prefixes or IEC binary kibibytes and t…
More tools · 4
💵Dividend CalculatorCalculate dividend yield and income and project dividend reinvestment (DRIP) …%APY CalculatorConvert APR to APY (and APY to APR) for any compounding frequency and see wha…🏦CD CalculatorCalculate a certificate of deposit's value at maturity from the deposit, CD r…📈Annuity CalculatorCalculate an annuity's future value, present value or payment for ordinary an…
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