All SpecWhale tools

Estimate the number of drywall sheets needed for a wall or ceiling area.

Estimate square yards of carpet and padding needed for a room.

Calculate mean and population standard deviation for two values (for full datasets use the list statistics tool).

Calculate population variance for two values.

Calculate joint probability of two independent events both occurring.

Calculate a confidence interval for a sample mean given standard deviation and sample size.

Calculate the missing side and angles of a right triangle from two known legs.

Calculate the area of a trapezoid from its two parallel sides and height.

Calculate the area of a parallelogram from base and height.

Calculate the area of a regular polygon from side length and number of sides.

Calculate the arc length of a circle from radius and central angle.

Calculate the area of a circular sector from radius and central angle.

Calculate the distance between two points in 3D space.

Calculate the magnitude and direction angle of a 2D vector.

Calculate the vertex of a parabola y = ax² + bx + c.

Estimate VO2 max using the Cooper 12-minute run test distance.

Estimate calories burned walking a given number of steps based on body weight.

Project retirement savings growth from current savings, monthly contributions, and annual return.

Project college savings growth from monthly contributions and years until enrollment.

Compare total cost of leasing versus buying a car over a term.

Calculate debt-to-income ratio from monthly debt payments and gross monthly income.

Estimate an affordable home purchase price using the 28% front-end ratio guideline.

Calculate how many months it takes to break even on mortgage refinance closing costs.

Calculate board feet for a piece of lumber from thickness, width, and length.

Estimate the number of wall studs needed for a wall length at standard on-center spacing.

Estimate roofing squares (100 sq ft units) needed from roof area.

Estimate how much wallpaper paste you need from wall area and your paste's coverage rate.

Scale a recipe ingredient amount from an original serving size to a new serving size.

Convert oven temperature between Fahrenheit, Celsius, and gas mark.

Estimate EU shoe size from a US men's shoe size using a standard offset formula.

Estimate US ring size from finger circumference in millimeters.

Calculate area of a rectangular baking pan to find an equivalent pan size.

Calculate employee turnover rate from separations and average headcount.

Calculate the break-even return on ad spend from profit margin.

Estimate customer lifetime value from average purchase value, frequency, and customer lifespan.

Estimate flight time from distance and average cruising speed.

Estimate excess baggage fees from actual weight versus allowance and a per-kg fee.

Calculate the time difference in hours between two UTC offsets.

Estimate CO2 emissions for a flight using an average emissions factor per passenger-mile.

Estimate body fat percentage using the US Navy circumference method for men.

Estimate lean body mass using the Boer formula.

Calculate waist-to-hip ratio and compare to general health ranges.

Estimate a daily water intake target from body weight.

Estimate monthly mortgage principal and interest payments.

Estimate monthly car loan payments from price, down payment, rate, and term.

Calculate the future value of a lump sum invested at a fixed annual rate.

Calculate the present value of a future lump sum given a discount rate.

Estimate the future value of regular monthly contributions at a fixed annual rate.

Calculate the break-even sales volume from fixed costs, price, and variable cost.

Convert nominal APR to effective annual yield (APY) given compounding frequency.

Estimate months to pay off a debt with a fixed monthly payment and interest rate.

Estimate monthly interest charges on a credit card balance.

Calculate net worth from total assets and total liabilities.

Solve ax² + bx + c = 0 for real or complex roots.

Calculate the exact number of permutations nPr.

Calculate the exact number of combinations nCr.

Calculate the exact value of n factorial (n!).

Calculate the exact greatest common divisor of two integers.

Calculate the exact least common multiple of two integers.

Calculate the area and circumference of a circle from its radius.