Online Calculators & Tools

Work out the area, weight, tonnage and tack strip for a carpet tear-out, then price it with your own quoted labour, tipping and haul-away rates.

Estimates the calories burned in a session from your average heart rate, sex, age and weight, using the published Keytel equations rather than a MET table.

Works out a league bowling handicap from an average, using the basis score and percentage your league sets, with the series total beside it.

Average rate of change of a function over an interval, with f(a), f(b), the working, the secant line and the mean value theorem point for a polynomial.

Series R-L-C values for one sinusoidal supply: both reactances, impedance, current, phase angle, power factor, the three powers and resonance.

Work out a year-to-date return both ways: the simple percentage change, and the money-weighted figure that takes your own contributions back out of it.

Yahrzeit dates from a Gregorian or Hebrew date of death, with the rules for 30 Cheshvan, 30 Kislev, Adar in a leap year and the sunset boundary.

Lay out frame-and-panel wainscoting so the panels come out equal across a wall, with stile spacing, layout marks and the cap, rail and base linear feet.

Work out true shooting percentage from points, field goal attempts and free throw attempts, with effective field goal percentage beside it for comparison.

Work out an owner-operator's cost per mile from fixed and variable costs, with the deadhead share that makes the loaded-mile rate different from the total-mile rate.

Total the cost of a laser tattoo removal course from your clinic's own rate, across the session range you were quoted, and against what the tattoo cost.

Work out the most you can put into an owner-only 401(k): the employee deferral plus the employer share, on the right base for Schedule C profit or a W-2 wage.

Simpson's D, 1 - D and 1 / D from species counts, with the proportion forms, Shannon beside them, and the per-species working set out in full.

Reduce a product or quotient of powers to a single term, applying the product, quotient, power of a power, negative and zero exponent laws with the arithmetic shown.

The geometrically correct field of view for a sim racing rig, worked out from your screen size and how far your eyes sit from the glass, for one screen or for triples.

Total capacitance of up to four capacitors in series or parallel, with the voltage across each one in a series chain and the charge and energy stored.

Usable ZFS pool capacity for RAID-Z1, Z2, Z3 and mirrors, with the parity cost, the raidz padding overhead, the 1/32 reserve and TB against TiB.

People per square kilometre and per square mile from a population and an area, in either direction, with physiological density when usable land is known.

Plan effort value training: battles to a target EV with Pokerus, items and vitamins, the 510 and 252 caps, and what a spread is worth in stat points.

Work the PSI or PORT score for community-acquired pneumonia: twenty weighted items, the risk class I to V and the cohort mortality behind it.

Turn a radar reading into what the hitter actually faces: effective velocity from the release point, travel time to contact and the reaction window.

Present value of an endless payment stream from PV = C / r, the growing form C / (r - g), and the reverse solves for the payment or the implied return.

Score a women's indoor pentathlon on the World Athletics tables: 60 m hurdles, high jump, shot put, long jump and 800 m, event by event.

Predicted peak flow from height, age and sex using the Nunn and Gregg 1989 equations, plus the percentage of personal best and the green, yellow and red bands.

Add up a PC build from your own part prices with tax, shipping and rebates, see where the money goes, and what the machine costs a month to actually own.

Runs a paired-samples t-test on the raw before and after columns, returning the differences, t, both p-values, a confidence interval and the effect size.

See what rolling negative equity into a new car loan really costs a month, and which month the new loan finally drops below what the car is worth.

Open channel flow by Manning's equation for rectangular, trapezoidal, triangular and part-full circular sections, with normal depth solved iteratively.

Solve a linear program two ways: two variables with the feasible region drawn and the optimum at a vertex, or the simplex tableau with every pivot shown.

Prices an insulation job from the area and the R-value you want, and lines up nine materials at the same R so depth and cost can be compared properly.

Gravitational force between two masses, surface gravity and escape velocity from a mass and radius, and the speed and period of a circular orbit.

Divide GDP by population, strip price change out with a deflator, split growth into output and people, and convert to international dollars.

Fall time, distance and impact speed for a drop under gravity, in a vacuum or with air resistance and a terminal velocity worked in.

How much of a dose is left after a given time at a stated half-life, and how far repeated dosing builds up before it levels off.

Offset, three point saddle and stub up marks for conduit, with the bender multipliers and the shrink that has to be added before you mark.

Work out the early withdrawal penalty on a CD, what you actually walk away with, and the month at which cashing it in stops eating part of your deposit.

Tubes of caulk from the width, depth and length of the joint, with the sealant depth and the backer rod size that joint should have.

Score a whitetail rack on the Boone and Crockett chart, typical or non-typical, with every right-to-left deduction shown line by line.

Exact two-pulley belt length from both diameters and the centre distance, with wrap angles, straight spans and a scale drawing, plus the centre distance for a belt you already own.

Work out the magic number for the team in front, the elimination number for the team behind, and the division magic number against every rival at once.

Bat length as a range from both the age chart and the height chart, plus the drop, the ounce range and the certification your league requires.

Score the ten activities of daily living on the Barthel Index, from feeding to stairs, and get the total out of 100 with the dependence band it falls in.

Work out acres covered per hour from implement width, ground speed and field efficiency, then turn it around for the hours a field takes or the width a deadline needs.

Astable frequency, period and duty cycle from R1, R2 and C, monostable pulse width from R and C, and the reverse solve with nearest E12 and E24 values.

Balanced three-phase power from the impedance of one winding, in wye or delta, keeping line and phase voltage and current apart and showing where the 1.732 factor belongs.

Converts watt hours to milliamp hours at a voltage you supply, and restates a mAh rating at a different voltage with converter losses allowed for.

Works out the water standing in a cased well from the casing bore, the total depth and the static water level, with gallons per foot and the purge volume.

Project a Thrift Savings Plan balance with the real agency contribution: the automatic 1%, the two-step match, and what front-loading the limit costs you.