Online Calculators & Tools

Estimates what painting a room costs from its dimensions, the coats and your own paint and labour prices, with openings deducted and the extras named.

Evaluates an expression by PEMDAS or BODMAS and lists every operation in the order it was applied, including what a plain left to right reading would give instead.

Compares a mortgage quoted with discount points against the same loan without them: what the points cost, the monthly saving and the break-even month.

Works out mileage reimbursement from miles driven at a rate you enter, from a trip, a pair of odometer readings, or against a second rate for comparison.

Estimates an LSAT scaled score from a raw score or from the three scored sections, using one stated linear rule and saying where that rule falls short.

Sizes life cover by the DIME method or a stated multiple of income, showing debt, income replacement, mortgage and education as separate components.

Estimates fat-free mass from height, weight and sex with the Boer, James and Hume equations, reports all three plus the average, and shows how far apart they land.

Builds ketogenic macros the way the diet actually works: carbohydrate capped in grams, protein set from lean body mass, and fat taking the calories left over.

Shows what an interest-only mortgage costs each month and how far the payment jumps once the interest-only period ends and the balance has to be repaid.

Evaluates definite integrals of polynomials by the power rule and of a fixed list of standard forms, showing the antiderivative and both limits.

Add, subtract, multiply, divide or raise whole numbers, negative ones included, with the sign rule spelled out and a quotient and remainder for uneven division.

Running and starting watts for a generator, summed from the appliances you list, with the surge multipliers named and the amps at 120 V and 240 V.

Estimates the furnace size a home needs in BTU, from floor area and climate zone with insulation and ceiling height, or from a heating load you already have.

Prices a fence from figures you enter, either as an installed rate per foot or line by line across posts, panels, concrete, gates, labour and tax.

Counts posts, sections, rails and panels for a fence from the run length, post spacing and gate openings, and counts pickets from board width and gap.

Works out a pitcher's earned run average from earned runs and innings pitched, reading the innings the way a box score writes them.

Whelping date for a pregnant dog from the mating, ovulation or LH surge date on the published 63 day canine average, with the likely window and the scan dates.

Daily calories and the cups or grams of your own food for a dog, from weight and life stage, using the published RER = 70 x kg^0.75 energy formula.

Find the dew point from air temperature and relative humidity, or run it the other way and get humidity from a measured dew point.

Interest for a run of days rather than a run of years, on actual/365, actual/360 or 30/360, either as simple per diem accrual or compounded daily.

Crosswind and headwind components from a runway heading, the wind direction and speed, with a magnetic or true reference and an optional gust figure.

Turns a chart's stitch count into a finished size on Aida, evenweave or linen, and the piece of fabric you need to cut for it.

Concrete volume and the rebar schedule for pad and continuous footings: cubic yards, bags, linear feet of steel and its weight by bar size.

Exact arithmetic on whole numbers of hundreds of digits: add, subtract, multiply, divide with a remainder, raise to a power or take a factorial.

Models an adjustable-rate mortgage through its caps: the starting payment, the worst case at every reset and the highest payment the note allows.

Finds the angle whose cosine is the value you enter, in degrees and in radians, and refuses values outside the -1 to 1 domain with a reason.

Finds the indefinite integral of polynomial terms by the power rule, plus 1/x, e^x, sin, cos and sec squared, and refuses anything outside that list.

The exact gap between two birth dates in years, months and days, both ages on any date, the ratio between them and the day the gap was two to one.

Works out the absolute neutrophil count from the white cell count and the neutrophil percentages on a blood report, in both cells/uL and 10^9/L.

Daily water target from the published Adequate Intake table or from your body weight, in litres, US cups and fluid ounces, with an allowance for exercise.

Turns questions missed, or points earned out of points possible, into a percentage and a letter grade, and says what the next letter up would take.

Expands e^x, sin x, cos x, ln(1+x) or the geometric series into a Taylor polynomial about any centre, then checks that polynomial against the true value.

Evaluate sigma notation term by term, use the closed form for an arithmetic or geometric series, or simply add up a list of numbers you paste in.

Turns a lawn area into rolls and pallets of sod, with a waste allowance for curved edges and beds, and the cost by the roll against the cost by the pallet.

Counts one Saturn orbit forward from your birth date to date your first, second and third Saturn return, with the window around each one.

Measures what you have saved against the published savings factors for each age: 1x income by 30, 3x by 40, 6x by 50, 8x by 60 and 10x by 67.

Monthly cash flow, cash on cash return, cap rate and debt service coverage for a rental, with every expense line shown and the mortgage counted.

Splits a holding period return into price and income, averages a run of yearly returns the way they actually compounded, and strips out inflation, fees and tax.

Turns a total price and a floor area into a rate per square foot, metre, yard and acre, compares two properties, and prices a commercial lease per month.

Damage rolls for a Pokemon battle using the main-series formula from Generation V onward. Enter the level, base power, both stats and the modifiers that apply.

Odds of catching a Pokemon from the species catch rate, remaining HP, ball and status, using the published capture check for Generation V onward or for III and IV.

Works out how many pizzas of a given size feed a group, in square inches rather than guesswork, and compares two sizes for value.

Finds the percentile rank of a value in a data set, the value that sits at any percentile, and the quartiles with the interquartile range.

Estimates the fertile window from the shortest and longest cycles you actually have, or from your last few period dates. An estimate, not contraception.

Area under the normal curve between two x values, and the reverse: the value sitting at any cumulative probability, from a mean and a standard deviation.

Prices the dealer's two offers against each other: the promotional low APR on the full price, or the cash rebate financed at your own bank's rate.

Turns a paycheck and its pay schedule into gross monthly income, counting 26 fortnightly paydays a year, and adds up several income sources at once.

Adds up total daily morphine milligram equivalents using the conversion factors CDC published in 2022. It is not a way to convert one opioid into another.