Online Calculators & Tools

Scores a ten-pin game frame by frame from the rolls you write down, showing how each strike and spare carries into the frames after it.

Splits your weight into fat and lean mass and moves them in opposite directions, so a recomposition shows up where the scale hides it.

Compares an accelerated biweekly schedule with monthly payments on the same loan: the payoff date, the time cut off the term and the interest saved.

All four BaZi pillars from birth details: year, month, day and hour, with the year turning at Lichun and the months set by the sun's ecliptic longitude.

Works out an aircraft loan payment, including the balloon these notes often carry, then adds hangar, insurance and fuel to give a cost per flight hour.

What a print costs to run: filament or resin, electricity, printer depreciation, your time and a failure allowance, plus a price at the markup you set.

The smallest copper conductor that carries the load and holds voltage drop, from NEC Table 310.16 with ambient, conduit fill and continuous load applied.

Rolls of wallpaper for a room, worked out from the wall run, the ceiling height, the pattern repeat and the width and length of the roll.

Work out your VDOT from one race result, see the equivalent times at nine other distances, and turn it into the Daniels E, M, T, I and R training paces.

Works the t statistic out from sample means, standard deviations and sizes, one sample or two, and gives the degrees of freedom, the p-value and the critical t.

Recommended surfboard volume in litres from your body weight, ability and the waves you surf, using the published Guild Factor shortboard bands.

Counts the time since a date you enter: days, weeks, whole months, a years-months-days breakdown, and the dates the usual day and year marks fall on.

Works out siding in squares and boxes from wall area less doors and windows, with a waste allowance, and totals the cost at your own prices.

Calculates serum osmolality from sodium, glucose and urea in US or SI units, and returns the osmolal gap when you add a measured osmometer result.

Return on a rental across the whole time you hold it, with the profit split into cash flow, appreciation, principal paid down and the costs of the deal.

Totals the calories, protein, carbohydrate and fat of a recipe from figures you take off the labels, then divides them per serving and per 100 grams.

Usable capacity, parity overhead and fault tolerance for RAID 0, 1, 5, 6 and 10, from the number of drives and the size of one drive.

Converts a gestational age in weeks and days into months, both ways, and states the rule it uses instead of leaving you to guess which chart is right.

Identifies a conic section from its general equation and returns the standard form, centre, vertices, foci, eccentricity, asymptotes and directrix.

Monthly payment on a swimming pool loan with the pool's running cost carried alongside it, or the project a monthly budget supports once upkeep is taken out.

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.