Online Calculators & Tools

Monthly payment on a home loan with principal, interest, tax, insurance, HOA and PMI, showing the month the mortgage insurance falls off and what it costs until then.

Multiplies whole numbers of up to fifty digits and shows the working: a partial product for every digit, the column they add up in, and every carry.

Cartons of laminate plus underlayment rolls, the expansion gap, the row layout with the stagger and the last row width, and the transition strips a floating floor needs.

Converts a height between feet and inches, centimetres and metres, and places a child or teenager from 2 to 20 on the CDC stature-for-age percentile chart.

Work out the fall a gutter run needs at a chosen slope, whether the fascia board can hide that drop, and where the downspouts go on a long run.

Tension a string pulls at a given gauge, scale length and tuning, and the reverse: the plain steel gauge a target tension needs at that pitch.

Convert gold karat to fineness and percent, work out what to add to reach a target karat, and price scrap gold from a spot rate you enter yourself.

Head loss and pressure drop in a pipe run by Darcy-Weisbach with Colebrook, shown next to Hazen-Williams for water so the gap between the two methods is visible.

Exact hypergeometric p value for a 2x2 contingency table, one tailed and two tailed, with the odds ratio and the whole distribution the p value is read from.

Costs an exterior paint job from the house measurements: walls, gables and openings, body and trim paint, primer, labour and prep, with the gallons to buy.

How many gallons a house exterior needs: wall area from the perimeter and gables, openings off, and body, soffit, trim and primer counted separately.

Expand a logarithm into a sum of simple terms with the product, quotient and power rules shown step by step, and condense a sum of logarithms back into one.

Turns decimal hours from a timesheet into hours and minutes, and back again, with the nearest minute, tenth and quarter hour payroll uses.

Adjusted cost basis from reinvested dividends, return of capital, wash sales and splits, plus the gain on a sale under FIFO, LIFO or a chosen lot.

Works out what a pour weighs from its volume or from slab dimensions, fresh and after curing, and the dead load a slab puts on the floor below.

Isentropic flow relations for a perfect gas: stagnation ratios at any Mach number, choked mass flow through a nozzle, and the Mach number behind a ratio.

Scores the five Bishop criteria - dilation, effacement, station, consistency and position - with the modifiers, and shows the band the total falls in.

Compare a bimonthly mortgage payment with semi-monthly, biweekly and monthly. Bimonthly means every two months, and it costs more, not less.

Prices a credit card balance transfer properly: the fee added to the balance, what clears inside the promotional rate, and what the rest costs afterwards.

Exact odds for an Axis and Allies battle: the chance each side wins, how many units survive and the expected IPC swing, worked out state by state rather than simulated.

Works out the dollars per paycheck and the deferral percentage that reach your 401(k) limit, with the age 50 and 60 to 63 catch-ups and the additions cap.

Solute potential from -iCRT plus pressure potential, in bars and megapascals, with the direction water moves between two solutions.

Size a storage tank from its first hour rating and peak hour demand, or a tankless unit from flow and the temperature rise your groundwater forces.

Volumetric flow rate from pipe or duct area and velocity, or from a volume and the time it took, in gpm, cfm, litres per second and cubic metres per hour at once.

Surface area of a triangular prism from the three sides and the length, with the area of every face, the volume and a scale drawing of the unrolled net.

Score an ATI TEAS practice test: percent correct in each of the four sections, overall, and the band your reported total has to fall inside.

Works out systemic vascular resistance from mean arterial pressure, central venous pressure and cardiac output, with the indexed figure and the pulmonary variant.

Lays two birth charts over each other, computing every planet, the lunar node and the angles for both, then listing each aspect between the two charts with its orb.

Weight of round bar, square bar, flat, plate, pipe, tube, angle and I beam in steel, stainless, aluminium and more, per foot and for the whole order.

Turns the watts or kilojoules an indoor bike reports into calories burned, with the resting share separated out and the implied MET shown.

The installed cost of a sodded lawn: sod, old turf removal, ground prep, labour, delivery and tax, plus a contractor quote against doing it yourself.

Writes a line as y = mx + b from a slope and a point, two points or standard form, and builds the parallel and perpendicular lines through any point.

Measure your own reading speed in words per minute from a timed passage, a word count or a number of pages, with the comprehension check.

Graph a parabola and get its vertex, axis of symmetry, intercepts, completed square, focus and directrix as exact values rather than read off the picture.

Draws the Punnett square for a one-gene or two-gene cross and gives the genotype ratio, the phenotype ratio and the percentage behind every box.

Multiplies two polynomials term by term, collects the like terms and returns the expanded product with its degree and leading coefficient.

Profit and loss at expiry for the basic option positions: long or short calls and puts, covered calls and vertical spreads, with break-even and the most you can make or lose.

Compares two or three mortgage offers on rate, term, points and fees, finds the cheapest over the horizon you pick, and shows the month one offer overtakes another.

Mortar for block and brick work from the unit count and the joint size, in bags of mix or in sand, cement and lime for a site batch.

Prices a manufactured home move by distance and section count, then adds permits, escorts, set and level, blocking, anchors and the utility disconnect.

Counts valence electrons, places the bonds and lone pairs, checks the octets and formal charges, and draws the structure for a single central atom.

Turns a rebuild cost into the full set of homeowners limits: Coverage A, then B, C and D as shares of it, with liability kept separate and the contents and loss-of-use figures tested.

Totals a nine or eighteen hole card: gross, net after a course handicap spread by stroke index, stableford points and the adjusted gross a round is posted with.

Scores the original 1977 Goldman index across its nine weighted criteria and reports the class, alongside what that class actually did in the cohort the index was derived on.

Free water deficit in hypernatraemia from total body water and the measured sodium, with the volume the usual 24-hour correction-rate limit allows and the rate that implies.

Cardiac output and cardiac index by the Fick principle, from oxygen consumption, haemoglobin and the arterial and mixed venous saturations.

How much epoxy a mould, river channel or flood coat takes, split into resin and hardener at any mix ratio by volume or by weight.

Multiplies out a(b + c) with every individual product written down, handles any number of letters, and factors the common term back out of an expression.