Online Calculators & Tools

Scores the 11-item QuickDASH arm, shoulder and hand questionnaire by its published rule, with the optional work and sports modules kept separate.

Fits the least squares parabola y = ax^2 + bx + c to a list of points and reports the coefficients, R squared and the vertex.

Lays every gestational week out on the calendar, from the last period to post-term, with the trimester and term boundaries and today's week marked.

Works the daily calories of a pregnancy from the DRI Estimated Energy Requirement and trimester increment, with protein, carbohydrate, fat, fibre and water.

Daily calories in pregnancy from the published Estimated Energy Requirement equation plus the trimester increment of 340 or 452 kcal a day.

Differentiates terms with any power of x, including roots, negative and fractional exponents, showing the rewrite and the rule applied term by term in exact fractions.

Prices a popcorn ceiling job line by line and compares scraping, boarding over the top, and licensed abatement on the same rooms.

Sizes a pool heater from the water volume, the surface area and the temperature rise you want, then works out the heat-up time, the fuel burned and the cost.

Counts the bales of pine straw a bed takes, from your supplier's coverage per bale, for rectangles, round beds and tree rings, with the cost.

Turns a pawnbroker's monthly finance charge into a cost to redeem and an APR, and weighs pawning an item against selling it outright.

Adds up what a car really costs at the dealership: price, destination, add-ons, doc fee, title and registration and sales tax, with trade-in and rebate handled.

Works out sword quality, Smithing XP and Foundry reputation from the bars in your crucible, and how many swords a Smithing level takes.

Solves linear equations with brackets, fractions and x on both sides, showing every step of the working and an exact fractional answer.

Turns grams of protein, carbohydrate, fat, fibre and alcohol into calories at the label conversion factors, and converts a calorie figure back into grams.

Works out the chance of getting a drop over a run of attempts, and the other way round: how many runs it takes before you are 90 or 99 per cent sure of one.

Works out the points a card earns in a year at your multipliers, what a point is really worth at a given redemption, and how long a target takes.

Builds a line by line budget for finishing a basement: moisture work, framing, insulation, electrical, drywall, ceiling, flooring, a bathroom, an egress window and the permit.

Finds the point on the far side of the world from any coordinate, with the distance straight through the Earth and around its surface.

Works out the accounts receivable turnover ratio and the collection period from net credit sales and the receivables balance, and sets it against your credit terms.

Work out overall equipment effectiveness from shift data: availability, performance and quality, the OEE they multiply to, and the minutes each loss cost.

Work out non-HDL cholesterol from total cholesterol and HDL alone, in mg/dL or mmol/L, with the printed reference band and the published goal.

Estimates what a log weighs from its two end diameters, its length and the density of the wood, with the Smalian and Huber volumes printed beside it.

Scores a livestock judging class on the Hormel system, out of 50, from the official placing and the three cuts, and grids all 24 placings.

Work out what buying your leased car costs, at lease end or early, from the residual, the purchase fee, tax and the payments you still owe.

Works out the clock time a set number of hours from now, or a set number of hours ago, and tells you which day the answer lands on.

Calories for a hike from the distance, the metres climbed and descended, your weight and the pack, split into the climbing leg and the descending leg.

Convert GPS coordinates between decimal degrees, degrees with decimal minutes and degrees minutes seconds, in either direction, with the precision spelled out.

Works out what a pane of glass weighs from its size and thickness, in pounds and kilograms, for single glazing, laminates and insulating units.

Shift, stretch and reflect a parent function: the new equation, the steps in order, where the key points land, and the domain, range and intercepts.

Turns a period into a frequency, counts cycles over a time into hertz, and converts between hertz, radians per second, rpm and bpm.

Plays the FLAMES name game for two names and shows every step: the letters that cancel, the count that is left and the order F L A M E S is struck out.

Draws f(x) = a times b to the power of x minus h, plus d, with the horizontal asymptote, the intercepts and a table of values.

Checks a bedroom or basement window against the IRC egress minimums for net clear area, width, height and sill, and sizes the window well.

Read a heart rate off an ECG strip: the 300 and 1500 box rules, the six-second complex count for irregular rhythms, or a measured RR interval.

Score a game of dominoes: points for the open ends in All Fives, Threes and Fives and Threes, the pips left in a hand, and the score at the end of a hand.

Map a bitch's heat cycle from the first day of bleeding: proestrus, standing heat, dioestrus and the next heats, or work out her own interval from two dates.

Turn a decimal into a percentage or a percentage back into a decimal, with the working shown and the decimal point moved exactly rather than multiplied.

Days sales in inventory from the inventory balance and cost of goods sold, with the inventory turnover ratio and the stock level a target DSI would need.

Work out a fifth edition D&D character's Armor Class from armor, Dexterity, a shield and magic bonuses, with the Stealth and Strength penalties spelled out.

Pack a list of different piece lengths onto as few sticks of stock as possible, with the kerf counted, the cut pattern drawn and the waste broken down.

Grows a balance at compound interest while regular withdrawals come out of it, and shows the closing balance year by year.

Midpoint composite chart for two births: Sun through Pluto, the node, both composite ascendants and the aspects inside it, plus the Davison chart.

Estimate how long a clean takes from a production rate or a room list, with the labour hours, the time on site and the crew size a window needs.

How many Christmas lights a tree takes, either from the 100-per-foot rule or from the real shape of the tree, plus strands to buy and the power they draw.

Sizes a coop and run for a flock: floor area, run area, perch length, nest boxes and ventilation, or how many birds a coop you already have will hold.

Work out volume, surface or linear charge density from a charge and a volume, area or length, in any common unit, with the elementary charge count.

Blade span for a room from the published size guideline, with the wall clearance that caps it and the downrod length for your ceiling height.

Turns a cat mating date into a kitten due date, with the usual 63 to 67 day window, the scan and x-ray dates, and how far along she is today.