Online Calculators & Tools

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.

Looks up what one published cohort found: how many pregnancies with a heartbeat seen at 6 to 10 weeks went on to miscarry. A record, not a prediction.

Finds the midpoint of two coordinate points, the missing endpoint when you know one end and the midpoint, and midpoints in three dimensions.

Mean, median, mode and range from one list of numbers, with the full five number summary, the interquartile range and any outliers.

Finds the mean absolute deviation of a list of numbers or a frequency table, about both the mean and the median, with every distance shown.

Finds the Maya day sign for a birth date from the 260 day Tzolkin count, with the Haab date, the Long Count and the correlation constant it used.

Totals linear feet for trim, fencing or gutter: around a room with the doorways taken out, from a list of measured pieces, or as whole boards to buy.

Applies the law of cosines on its own: a third side from two sides and the angle between them, or any angle from three sides, with every step shown.

A line by line kitchen remodel budget at three finish levels, with cabinets by the linear foot, counters by the square foot, and a list of what it leaves out.

Estimates a home addition line by line: new floor area, foundation, tie-in to the existing house, bathrooms, heating, design fees and contingency.

Scores an English word in six gematria ciphers at once, or a Hebrew word by its standard letter values, and shows the letter-by-letter sum.

Work out the oil for a two-stroke mix at any ratio, check the ratio you actually poured, or find the fuel that matches a bottle of oil you already have.

Great circle distance between two sets of coordinates and the flying time at a cruising speed you choose, plus a ground allowance and the initial heading.

Fat-free mass index from weight, height and body fat, with the height-normalized version, in metric or imperial units.

Work out engine displacement from bore, stroke and cylinder count, in cc, litres and cubic inches, with an optional overbore for a block bored oversize.

Counts the drywall sheets a room needs and prices the job from your own sheet cost and hanging rate, with openings deducted and a waste allowance added.

Dilutes a stock to a target strength in percent, mg/mL or ppm, lays out a serial dilution series, and turns a label ratio such as 1:10 into real volumes.

Determinant of a square matrix from 2 x 2 up to 6 x 6, with every row operation, the pivots and the sign from the row swaps written out.

Totals a dental implant quote line by line, from the post and crown to extractions and grafting, then applies insurance and a payment plan.

Compares keeping the debts you have against clearing them with one consolidation loan, showing both monthly payments and both total interest figures.

Applies the Payne albumin correction to a total serum calcium result, in mg/dL or SI units, with the formula, its assumptions and its limits stated.

Models the interest-only draw period while a house is built, then the permanent mortgage payment the loan converts to at completion.

Standard deviation divided by the mean, as a percentage. Works from a list of numbers or from summary figures, and compares two sets side by side.

Convert a cat's age to human years using the published International Cat Care chart, and see the life stage the 2021 AAHA/AAFP guidelines place it in.

Adds up a year of home energy, driving, flights and diet using published EPA, EIA and peer-reviewed emission factors, each one named and dated in the result.

Projects what a vehicle will be worth using the declining balance model, with a steeper first year, and works the rate back from a real resale value.

Works out the calories burned on a run from your weight, distance and either the time or the pace, and reports the cost per mile and per kilometre.

Values a small business two ways, on a multiple of seller discretionary earnings and on a discounted cash flow, and shows each as a range rather than one figure.

Turns underbust and bust measurements into a band and cup size in US, UK and European labelling, with the sister sizes that hold the same cup volume.

BMI percentile for children and teens aged 2 to 20, read against the CDC 2000 BMI-for-age reference by sex and age in months, with the weight status category.

Estimates blood alcohol with the Widmark equation from drinks, body weight and time, reported as a wide range. It cannot tell anyone they are safe to drive.

Budget a window replacement job line by line: window units by frame material, installation labour, trim, disposal and permit, as a low to high range.

Converts wheel offset to backspacing and back, and compares two wheels to show how far the new one moves toward the fender or the suspension.

Turns a starting weight and a current weight into the percentage of body weight lost, with the five and ten percent marks and progress to a goal.

Divides waist by hip circumference and reads the result against the WHO 2008 cut-offs, in centimetres or inches, with the waist measurement checked too.

Turns a bed or lawn measurement into bags of topsoil and bulk cubic yards, compares the cost of both, and fills raised beds with a soil blend.

Liquid capacity of capsule, oval, cone bottom and rectangular tanks, full or part full, in gallons, litres and cubic feet from inside dimensions.