Online Calculators & Tools

Evaluates a piecewise function you enter as numbered pieces with numeric bounds, at one value of x or across a range, and says which piece was used.

Turns a t statistic or an F statistic and its degrees of freedom into a p-value, in either tail, with the tail computed rather than read from a printed table.

Net present value of a series of cash flows at a discount rate you choose, with the present value of each period, the profitability index and discounted payback.

Compares the lump sum against the annuity on a lottery jackpot: cash option, the graduated payment schedule, tax at a rate you enter and the break-even return.

Works out LTV, CLTV and HCLTV from a property value and the liens against it, and what it takes to bring a balance down to a target ratio.

Kinetic energy from mass and velocity, or the formula rearranged to recover the mass or the speed. Metric and imperial units throughout.

Inverts eleven standard Laplace pairs, and proper fractions over two or three different real linear factors, returning the residues, f(t) and a value at t.

Budget frame for renovating a whole house: general work by the square foot, plus wiring, plumbing, heating, windows, roof, kitchen and bathrooms as their own lines.

How hot the air actually feels once humidity is counted, from the published National Weather Service Rothfusz regression and its corrections.

Graphs a linear inequality in two variables as a shaded half-plane, with a solid or dashed boundary, a test point and the region of a system.

Score differential, handicap index average and course handicap, worked the World Handicap System way from your scorecard numbers.

Counts the surgical global period from the date of the procedure and the 0, 10 or 90 day designation its code carries, and checks whether a later encounter falls inside it.

Gearing from debt and equity: the debt to equity ratio, capital gearing, the debt ratio, net gearing after cash and interest cover.

Payment and interest on a farm loan paid once or twice a year instead of monthly, with the debt service per acre on farmland and the balance at a balloon.

Yards of fabric a sewing project needs, laid out across the bolt: pieces per width, rows down the length, seam and shrinkage allowance and the cost.

Evaluates a double integral of a polynomial in x and y, over a rectangle with constant bounds or over the strip between two straight lines, exactly and step by step.

Work out a powerlifting DOTS score from bodyweight and total, or from the three lifts, and see the total a target score would take.

Pressure altitude from field elevation and altimeter setting, then density altitude from the temperature, with ISA deviation, density ratio and an optional dew point.

Convert between binary, octal, decimal and hexadecimal in any direction, fractional parts included, and see the division steps behind a whole number.

Works out how many calories a cat needs each day from its weight and life stage, then turns that figure into an amount of the food you actually feed.

Hits divided by at-bats, printed the way a box score does, with slugging, on-base percentage and OPS from the same line and the hits needed for a target average.

Runs the arithmetic on a blood gas report: Henderson-Hasselbalch, the anion gap with and without albumin correction, the delta ratio and expected compensation.

Estimates the cooling load of a house in BTU per hour and turns it into air conditioner tons, using the square-foot rule with climate and insulation factors.

Narrows a built-in list of common five-letter words down to the ones that still match your green, yellow and grey tiles, then ranks what to guess next.

Win percentage from wins, losses and ties under all three tie conventions, plus the run of straight wins it takes to reach a target percentage.

Estimates the daily calories needed to gain weight at a rate you choose, and how long a goal weight takes at a given surplus. An estimate, not dietary advice.

Work out a weighted average cost of capital from the market value of equity and debt, the cost of each and the corporate tax rate.

Converts a signed decimal to its two's complement bit pattern and reads a pattern back again, at 4 to 64 bits, in binary and hex, stating any overflow.

Works out where a TV goes on the wall from the screen size, your seated eye height and the seating distance, with the vertical viewing angle checked.

Does the towing arithmetic on ratings you read off your own vehicle: GCWR minus the loaded vehicle, payload against tongue weight, and the limit that bites first.

Turns a step count into calories from your step length and body weight rather than a flat per-step figure, at the walking pace you pick.

Parlay payouts, the stake that hedges a bet you already hold, and how much margin a two-sided market carries, all from American odds.

Bedtimes for a wake-up time, wake times for a bedtime, and the hours between the two, all worked out in whole sleep cycles.

Itemises what a home seller pays at closing: commission, transfer tax, title, escrow, attorney, prorated tax and buyer credits, with the total as a share of the price.

Works out how many recessed cans a room needs and how far apart they go, either from the ceiling height rule or from the light level the room calls for.

Turns engine output and vehicle weight into hp per pound, pounds per horsepower, hp per ton and watts per kilogram, and puts two vehicles side by side.

Works out how many sheets of plywood or OSB an area needs, from length and width, a square footage or the walls of a room, with waste and cost.

Works out the NFL passer rating from attempts, completions, passing yards, touchdowns and interceptions, and shows all four capped components.

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.