Free Online Calculators & Math Tools
51 calculators and math tools for money, school, everyday life, health and DIY, plus graphing and maths diagrams. Each one is instant, runs in your browser, and sends nothing you type to a server.
Featured
Good places to start.
- FeaturedGraphing CalculatorPlot equations, functions, inequalities, tables and data on an interactive graph.
- FeaturedMaths Diagram GeneratorCreate clean mathematical diagrams, add measurements and labels, and export them instantly.
- FeaturedPercentage CalculatorPercentages of a value, ratios, and increase or decrease.
- FeaturedGST CalculatorAdd GST to a price, or pull it back out of an inclusive one.
- FeaturedSIP CalculatorSee what a monthly SIP could grow to, split into amount invested and returns.
- FeaturedCGPA to Percentage CalculatorConvert CGPA or GPA to a percentage with CBSE, VTU, 10-point or custom formulas.
GST CalculatorFeaturedAdd GST to a price, or pull it back out of an inclusive one.EMI CalculatorMonthly instalment, total interest and what the loan really costs.Compound Interest CalculatorWhat an amount grows to, and the effective rate behind it.Simple Interest CalculatorInterest on the principal alone — SI = P × R × T / 100.Profit & Loss CalculatorProfit or loss from a cost and selling price, with the margin too.SIP CalculatorFeaturedSee what a monthly SIP could grow to, split into amount invested and returns.Lumpsum CalculatorEstimate the future value of a one-time investment, with an optional inflation check.PPF CalculatorProject a PPF balance year by year from your yearly deposit, rate and duration.FD CalculatorFind the maturity amount and interest on a fixed deposit for any compounding frequency.RD CalculatorEstimate the maturity value of a recurring deposit, with each month's deposit earning for its own term.Take-Home Salary CalculatorTurn an annual CTC into monthly in-hand pay after PF, professional tax and other deductions.CAGR CalculatorFind the compound annual growth rate between a starting and an ending value.Inflation CalculatorSee what an amount will be worth, or will need to be, after years of inflation.Stock & Crypto Profit CalculatorWork out profit or loss, percentage return and break-even price for shares or coins.
Average CalculatorMean, median, mode and spread for any list of numbers.Student Percentage CalculatorTotal marks to a percentage, across subjects with any maximums.CGPA to Percentage CalculatorFeaturedConvert CGPA or GPA to a percentage with CBSE, VTU, 10-point or custom formulas.GPA CalculatorSemester GPA from your subjects, credits and grades, with an optional cumulative GPA.Attendance CalculatorFind how many classes you can skip, or must attend, to keep 75% attendance.Final Grade CalculatorWork out the score you need on the final exam to reach your target overall grade.
Percentage CalculatorFeaturedPercentages of a value, ratios, and increase or decrease.Age CalculatorYour exact age in years, months and days — plus your next birthday.Discount CalculatorSale price and how much you actually save.Date CalculatorDays between two dates, or add and subtract time from one.Time Duration CalculatorHours and minutes between two times, overnight shifts included.Download Time CalculatorHow long a file takes to download at a given connection speed.Fuel Cost CalculatorFuel needed and what a trip costs, from distance, mileage and fuel price.Currency ConverterConvert between 10 currencies using a preset rate, or one you enter.Split Bill CalculatorSplit a bill and tip between friends, evenly or by what each person had.Electricity Bill CalculatorWork out the monthly kWh and cost of each appliance, and which ones cost the most.Recipe ScalerScale a recipe up or down to any number of servings, with kitchen fractions.Time Zone CalculatorConvert a date and time between cities and see the time difference and any date change.
BMI CalculatorBody mass index from your height and weight, with its category.BMR & TDEE CalculatorEstimate your basal metabolic rate and daily maintenance calories.Calorie Goal CalculatorTurn your maintenance calories into a daily target with a modest deficit or surplus.Body Fat CalculatorEstimate body fat percentage from tape measurements with the US Navy method.Water Intake CalculatorA rule-of-thumb estimate of daily fluid from weight, exercise and climate.Ideal Weight CalculatorCompare the Devine, Robinson and Hamwi ideal body weight formulas for your height.
Construction & DIY
Tiles, paint and concrete — quantities rounded up to what you buy. · 3 calculators
Open categoryTile CalculatorWork out how many floor tiles and boxes to buy, with a waste allowance, rounded up.Paint CalculatorEstimate litres or gallons of paint for a room from wall sizes, openings, coats and coverage.Concrete CalculatorFind the volume of concrete for a slab, footing or column in m³, ft³ and yd³, with bags if you want them.
Math & Statistics
Algebra, number theory and statistics, with the working shown. · 9 tools
Open categoryScientific CalculatorTrigonometry, logarithms, powers and roots in one expression.Fraction CalculatorAdd, subtract, multiply and divide fractions — exactly.Graphing CalculatorFeaturedPlot equations, functions, inequalities, tables and data on an interactive graph.Maths Diagram GeneratorFeaturedCreate clean mathematical diagrams, add measurements and labels, and export them instantly.GCD & LCM CalculatorGCD (HCF) and LCM of two or more whole numbers, with the prime factors shown.Quadratic Equation SolverSolve ax² + bx + c = 0: discriminant, real or complex roots, with every step shown.Permutation & Combination CalculatorWork out nPr and nCr exactly, with the formula and the working shown.Standard Deviation & Variance CalculatorPopulation and sample standard deviation and variance, plus mean, median and range.Ratio & Proportion CalculatorSimplify a ratio to lowest terms or solve A : B = C : x, with the steps shown.
Conversion
Switch between units instantly. · 1 calculator