kitty/bin Calc
Calculators, converters and charts
Calculators, statistics, number converters and charts. All running in your browser, with nothing uploaded.
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most used
Percentage calculatorWork out X% of a number, what percent one number is of another, percentage change and reverse percentages, with the formula shown.Scientific calculatorTrig, logs, powers, roots and factorials, with keyboard support and history.Unit converterConvert length, mass, volume, temperature, area, speed, data, energy, pressure and fuel economy with exact factors.Age calculatorFind an exact age in years, months and days, the weekday you were born and the days until your next birthday.Mortgage calculatorEstimate your monthly mortgage payment from price, down payment, rate and term, with total interest, an amortization table and extra payments.Graphing calculatorPlot y = f(x), pan and zoom, trace values, and find roots and intersections.
More all-in-one tools
School and statistics
Statistics calculatorMean, median, mode, quartiles and standard deviation for any list of numbers.Final grade calculatorFind the score you need on your final exam to reach the grade you want.Fraction calculatorAdd, subtract, multiply and divide fractions and mixed numbers, with every step shown.Decimal to fractionTurn any decimal or percent into a fraction in simplest form, including repeating decimals like 0.333...Weighted grade calculatorWork out your overall grade from weighted categories, and what you need on the work still to come.Z-score calculatorZ-scores, p-values for z and t tests, and confidence intervals, with the working shown.P-value calculatorGet the p-value for a z-score or a t statistic with its degrees of freedom, one or two tailed, and see whether it is significant.Confidence interval calculatorWork out a 90, 95 or 99 percent confidence interval for a mean or a proportion from your sample, with the margin of error shown.GradebookA private gradebook with weighted categories, totals, letter grades and CSV import and export.
Number converters
Number converterBinary, octal, decimal and hex, Roman numerals, and numbers written in words.Roman numeral converterConvert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3999.Number to wordsWrite any number out in English words, with or without “and”, or as a check amount with cents.
Money
Loan calculatorWork out the monthly payment and total interest on any fixed-rate loan, with the full schedule and what extra payments save.Compound interest calculatorSee how savings grow with compound interest and regular deposits, with a year-by-year table, or find the deposit that reaches your goal.Discount calculatorFind the sale price after a discount, stack a second discount and add sales tax to see the final price and what you save.Tip calculatorWork out the tip and split the bill between any number of people, with the option to round up each share or the total.Budget plannerA monthly budget with 50/30/20 and zero-based views, charts and CSV export, kept on your device.Invoice makerMake an invoice with your logo, tax, a payment QR code and numbering, track what is unpaid, and download a clean PDF.Quote makerMake a quote or estimate as a clean PDF, then turn it into an invoice in one click.TimesheetTrack time with a timer or by hand, round it and add the hours to an invoice.Expense ledgerAdd receipts, sort them by category and month, and export a CSV or an expense report PDF.Salary calculatorSalary to hourly and back, a simple take-home pay estimate, sales tax and percentage change.Salary to hourly calculatorConvert a yearly salary to an hourly rate, or an hourly wage to a yearly salary, using your own hours per week and weeks worked.Take-home pay calculatorEstimate take-home pay from your gross pay and the tax and deduction rates you enter.Sales tax calculatorAdd sales tax to a price or work out the price before tax from a total.
Dates and time
Date difference calculatorCount the days, weeks, months and business days between two dates, or add and subtract days from a date.Time calculatorAdd and subtract hours and minutes, find the time between two times even past midnight, and add a duration to a clock time.Time zone converterSee one time in every city you add, daylight saving included, with a meeting planner.Meeting plannerLine up working hours in several cities and see where they overlap.
Everyday sums
BMI calculatorCalculate BMI in kg and cm or pounds, feet and inches, with the WHO adult category and healthy weight range for your height.GPA calculatorCalculate your GPA on the 4.0 scale from grades and credits, with Honors and AP weighting and your cumulative GPA.Random generatorFair random numbers, dice rolls, coin flips and list picks from your browser's secure source.Dice rollerRoll any number of dice with a total and modifier.Coin flipFlip one coin or a thousand and keep a running tally of heads and tails.Percentage change calculatorFind the percentage increase or decrease from an old value to a new one, and the percentage difference between two numbers.
Health
Calorie calculatorEstimate daily calories with BMR and TDEE, and body fat with the US Navy method.TDEE calculatorEstimate your total daily energy expenditure from age, height, weight and activity with the Mifflin-St Jeor equation.Body fat calculatorEstimate body fat percentage from height, neck, waist and hip measurements with the US Navy formula, in centimetres or inches.
Charts
Algebra
Equation solverSolve linear, quadratic, cubic and polynomial equations and linear systems, with every step shown.Matrix calculatorDeterminant, inverse, RREF, rank, LU and eigenvalues up to 8x8, in exact fractions with steps.Calculus calculatorIntegrals, derivatives and limits with every step shown, plus a graph.Integral calculatorIntegrate any function with every step shown: substitution, integration by parts, partial fractions and trig identities.Derivative calculatorDifferentiate any function and see each rule applied: power, product, quotient and chain rules, exponentials, logs and trig.Limit calculatorFind limits with the working shown: direct substitution, factoring, conjugates, L'Hopital's rule and limits at infinity.
Geometry
Geometry calculatorSlope, distance and midpoint, the Pythagorean theorem, and the area and volume of common shapes.Slope calculatorEnter two points to get the slope, the line equation, the distance between them, the midpoint and the angle, with every step shown.Pythagorean theorem calculatorFind the hypotenuse or a missing leg of a right triangle with a squared plus b squared equals c squared, plus its angles and area.Area calculatorWork out the area of rectangles, triangles, circles, trapezoids, parallelograms and ellipses in any unit, with the formula shown.Volume calculatorWork out the volume and surface area of cubes, boxes, cylinders, spheres, cones and pyramids, with the formula shown and litres too.
Chemistry
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