Online Calculators & Tools

Predicts puppy coat colours from six dog coat loci at once, handling the way recessive red, dominant black and merle hide everything underneath them.

Works out a name number on the Chaldean chart, where letters run 1 to 8 and no letter is ever a 9, and reads the two digit compound number as well as the root.

Estimates the extra daily energy breastfeeding costs, from the baby's age and how much of the feeding is breast milk, or from a milk volume you have measured.

Works out the ankle-brachial index for each leg from four ankle pressures and two arm pressures, with the published bands and the calcified-vessel caveat.

Builds a trip budget from daily spending, nights, flights and a contingency, and reports the cost per person per day as the headline figure.

Works out a USSSA playing age from a date of birth and the program's determination date, then names the age group the player belongs in.

Turns two quantities into a unit rate and its reciprocal, and ranks up to four pack sizes at once to show which one is cheapest per unit.

Works out GD&T true position as twice the radial deviation from the basic location, with the bonus tolerance a circle M or circle L modifier earns.

Scales a standing tree into board feet from its diameter, merchantable height and form class, then prices it on Doyle, Scribner or International.

Adds static lift, pipe friction, pressure head and velocity head into the total dynamic head a pump has to deliver at your design flow.

Turns a daily step count into a calorie deficit and a range of likely weight change, showing both the 3,500 rule figure and the smaller one that allows for adaptation.

Sizes a solar battery bank from daily energy use, days of autonomy and depth of discharge, and compares lead acid against lithium on usable capacity.

Prices a septic system line by line: tank, excavation, drainfield, perc test, design, permits and restoration, with every rate an input you can overtype.

Turns a Galloway run-walk ratio and its two paces into one overall pace and a finish time, and solves backwards for the running pace a target needs.

Works out how much renters insurance cover you need: contents from a room-by-room inventory, replacement cost against actual cash value, liability and the deductible.

Clears a square root out of a denominator, either a single surd or a sum handled with its conjugate, with every step shown and the surviving root simplified.

Fills in the missing cells of a ratio table, shows the scale factor behind each column, and checks that the columns you already had agree with each other.

Works out the urine protein-to-creatinine ratio in mg/mg, mg/g and mg/mmol, grades it against the KDIGO bands and estimates the 24-hour protein.

Prices a pressure washing job surface by surface at its own rate, adds the trip charge, chemicals and minimum, and gives the blended cost per square foot.

Works out Fajr, Dhuhr, Asr, Maghrib and Isha from coordinates and a date, using the calculation method and Asr shadow rule you pick.

Finds the orthocenter of a triangle from three vertices as an exact fraction, with the altitude equations, the circumcenter, the centroid and the Euler line.

Reduces two birth dates to their life path numbers and scores the pairing from a fixed numerology scheme, with both of its tables shown. Entertainment only.

Adult maintenance IV fluid volume by the Holliday-Segar rule, showing both the 4-2-1 hourly rate and the 100-50-20 daily volume it was rounded from.

Bushels in a round grain bin from its diameter and grain depth, with the heaped cone, the hopper bottom, packing, test weight and drying shrink.

Works out gear ratio from tooth counts: a one, two or three stage gear train with output speed and torque, or a final drive from ring and pinion.

Sizes a garage heater in BTU and kW from the dimensions, the insulation, the overhead door and the slab edge, and prices four fuels against each other.

Raises a number or a fraction to a fractional exponent and returns the radical form, the exact simplified surd where one exists, and the decimal.

Builds the stainable surface of a fence board by board, both faces, picket edges, rails and posts, then prices the stain, prep, labour and tax from your rates.

Lays out a suspended ceiling grid: equal border cuts on facing walls, main runners at 4 ft, cross tees, panels whole and cut, and wall angle.

Prices a deck staining job: stain in the cheapest mix of quarts, cans and pails, plus cleaner, sundries, cost per square foot and cost per year.

Classic and skate ski lengths with pole lengths from your height and weight, using the published rules, and the weight chart set beside the height rule.

Counts a filing deadline in calendar or court days, rolls it off weekends and federal holidays, and adds the three days for service by mail.

Works out compa-ratio and range penetration from a salary and its pay band, shows which quartile the salary sits in, and what a raise does to both numbers.

Monthly cost of a commercial lease with CAM, tax and insurance pass-throughs, the load factor between rentable and usable space, and the effective rent.

Turns the parts of a Chapter 13 plan into a monthly payment, or a payment you can afford into the dividend unsecured creditors receive, with the trustee fee grossed up.

Theoretical boat speed from propeller pitch, engine rpm and gear ratio, propeller slip from a measured GPS speed, and the pitch change for the rated rpm range.

BMX roll-out, gain ratio and gear ratio from the sprockets, the real wheel and tyre, and the crank length, with two setups compared side by side.

Frame size bracket from inseam, plus the stack and reach trigonometry that says where a stem and spacer stack actually put the bars, and what matches one frame to another.

Sizes a bathroom exhaust fan by floor area, by air changes and by fixture count, then works out how much of that rating the duct run will actually let through.

Builds a collision estimate from body hours, refinish and blend panels, paint materials, parts and tax, then tests the total against the vehicle value.

Works out what an acceptance sampling plan actually does, computing the operating characteristic curve exactly from the hypergeometric distribution rather than reading a table.

Works out the water needed to bring a spirit down to a target ABV, including the contraction that makes ethanol and water mix to less than the sum of their volumes.

Air density from temperature, absolute pressure and humidity, treating dry air and water vapour as separate partial pressures, plus the standard atmosphere at any altitude.

Solves a bond's yield to maturity from its price, coupon, face value and term, with the current yield, the yield to call and the price-yield curve.

Exact sine, cosine and tangent anywhere on the unit circle, with the quadrant, the reference angle, the coterminal angle and the point written in radicals.

Prices a T-bill from its quoted discount rate and returns the discount rate, the money market yield and the Treasury investment rate side by side.

Pace from a treadmill belt speed, plus the incline adjustment: the flat belt speed and the outdoor pace that cost the same oxygen, from the ACSM equations.

Billable units from treatment minutes under the Medicare 8-minute rule, and the productivity percentage those units give against a worked day.