Latest posts
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Surface Area Calculator
Calculate the surface area of a box, sphere, cylinder or cone from its dimensions.
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Student Loan Calculator
Estimate the monthly payment and total interest on a student loan.
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Statistics Calculator
Get the full summary of a data set: mean, median, mode, range, variance, standard deviation and quartiles.
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Standard Deviation Calculator
Paste a list of numbers to get the sample or population standard deviation, variance, mean, sum and count.
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Stair Calculator
Enter the total rise between floors to get the number of steps, the riser height and the total run.
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Square Footage Calculator
Measure any rectangle, circle or triangle to get the area in square feet — plus square yards, square meters and acres.
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Speed Calculator
Enter a distance and time to get speed in mph, km/h and metres per second, plus pace per mile.
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Soil Calculator
Calculate how much garden soil you need in cubic yards, cubic feet and bags for beds, borders and planters.
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Slope Calculator
Enter two points to get the slope, y-intercept, equation and angle of the line through them.
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Sleep Calculator
Find the best times to go to bed or wake up, based on 90-minute sleep cycles.