Online Calculators & Tools

Works out the calories burned on a run from your weight, distance and either the time or the pace, and reports the cost per mile and per kilometre.

Values a small business two ways, on a multiple of seller discretionary earnings and on a discounted cash flow, and shows each as a range rather than one figure.

Turns underbust and bust measurements into a band and cup size in US, UK and European labelling, with the sister sizes that hold the same cup volume.

BMI percentile for children and teens aged 2 to 20, read against the CDC 2000 BMI-for-age reference by sex and age in months, with the weight status category.

Estimates blood alcohol with the Widmark equation from drinks, body weight and time, reported as a wide range. It cannot tell anyone they are safe to drive.

Budget a window replacement job line by line: window units by frame material, installation labour, trim, disposal and permit, as a low to high range.

Converts wheel offset to backspacing and back, and compares two wheels to show how far the new one moves toward the fender or the suspension.

Turns a starting weight and a current weight into the percentage of body weight lost, with the five and ten percent marks and progress to a goal.

Divides waist by hip circumference and reads the result against the WHO 2008 cut-offs, in centimetres or inches, with the waist measurement checked too.

Turns a bed or lawn measurement into bags of topsoil and bulk cubic yards, compares the cost of both, and fills raised beds with a soil blend.

Liquid capacity of capsule, oval, cone bottom and rectangular tanks, full or part full, in gallons, litres and cubic feet from inside dimensions.

Convert square feet to linear feet, or back again, using the width of the boards or rolls you are buying, plus a waste allowance and a piece count.

Solves for speed, distance or time from the other two, in miles, kilometres, metres, feet, yards or nautical miles and five speed units.

Panels and system size needed to cover your monthly kWh, from panel wattage, peak sun hours and system losses, plus output and simple payback.

Suggests a ski length from height, weight, ability and the kind of ski, using the published retailer size charts, and shows every step of the adjustment.

Turns building measurements and a pitch into sloped roof area and squares, plus rafter length, ridge, eave and rake runs and the roof angle in degrees.

Works out how long a retirement balance lasts at a given withdrawal, or how much may be withdrawn for it to last a set number of years.

Works out the bags of salt a saltwater pool needs to reach its target salinity, and how much water to replace when the reading is too high.

Works out Pokemon type matchups from the eighteen type chart. Pick a single or dual typing for its weaknesses, or a move type for its damage multiplier.

Separates documented medical costs and lost income from a pain and suffering range built on a multiplier you choose. Not a case valuation.

Project your next period dates, the estimated ovulation day and the fertile window from your last period and your usual cycle length.

Find the percent increase or decrease between two values, apply a percent change to a number, or work back to the value a known change started from.

Convert powder in milligrams and bacteriostatic water in millilitres into a concentration, a draw volume and U-100 insulin syringe units.

Plan the soft drinks, mixers, bottled water, ice and cups for a party from your guest count, the hours and how many guests skip alcohol.

Enter any two of voltage, current, resistance and power and get the other two, with the formula used and unit prefixes from microamps up to kilovolts.

Estimates maximum heart rate from age using four named published equations, and shows how far apart they are instead of hiding behind one.

Finds the internal rate of return on an uneven series of cash flows, solved numerically, with the net present value at any discount rate alongside it.

Finds the inverse of a linear, rational, power, exponential or logarithmic function from its coefficients, with the swap and solve steps written out.

Solves linear, quadratic, absolute value and compound inequalities from their coefficients, in inequality and interval notation with the steps shown.

Build a line-by-line budget for a new house: living space, garage, site work, design fees, contingency and land, each shown with its own figure.

Work out your five training zones in beats per minute by the Karvonen heart rate reserve method, from your age and resting pulse.

Work out the doubling time and percentage change between two quantitative beta hCG blood results and the hours between the draws.

Counts the terms left to a degree from credits remaining and credits per term, and works the other way to find the load needed to finish on time.

FIRE stands for Financial Independence, Retire Early. Works out how many years of saving separate you from the point where investments cover your spending.

Works out the score you need on the final exam to reach a target course grade, from your current grade and the weight the syllabus gives the final.

Turns watts and hours into kilowatt hours and money. Cost an appliance per hour, day and year, or price a metered reading with standing charges.

Finds the eigenvalues and real eigenvectors of a 2 x 2 or 3 x 3 matrix by solving the characteristic polynomial exactly, complex pairs included.

Gives the domain and range of seven named function families in interval notation, with the asymptote, vertex or endpoint that produces the answer.

Dividend income from shares, price and yield, a year by year projection with reinvestment, and the payout ratio from earnings per share.

Solves first order linear, logistic and second order homogeneous differential equations exactly from numeric coefficients and initial conditions.

Counts the deck boards, screws, joists, beam, posts, footings and railing pieces a simple rectangular deck needs from its length and width.

Works out one billing cycle of card interest from the daily periodic rate, and shows how much of a single payment is swallowed by that interest.

Count the CMU blocks, mortar bags and courses for a block wall from its length and height, and the grout needed if the cores are filled.

Works out a commercial property loan payment over a long amortization, the balloon left when the shorter term matures, and the debt service coverage ratio.

Works out the calving date from a breeding date using a 283 day gestation, with a window either side, or works backwards from the calving date you want.

See the larger loan a cash-out refinance leaves behind: new balance, loan-to-value, the new payment and what the released cash costs over the term.

Prices carpet from the roll rather than the floor area: full width runs, which way to lay them, seam count, linear feet to order, padding and fitting.

Builds the full amortization schedule for a car loan, listing every payment with its interest, principal and remaining balance, or one line per year.