Latest posts
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Percent Error Calculator
Compare a measured value to the true value to get the percent error and the absolute error.
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Payment Calculator
Find the monthly payment on any loan from the amount, interest rate and term.
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Payback Period Calculator
Find how long an investment takes to recover its cost from its annual cash flow.
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Paver Calculator
Enter your patio size and one paver’s dimensions to find how many pavers you need — including a waste allowance for cuts and breakage.
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Password Generator
Create strong, random passwords with adjustable length and any mix of uppercase, lowercase, numbers and symbols.
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Paint Calculator
Estimate how much paint a room needs from its dimensions, doors, windows and number of coats.
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Pace Calculator
Enter a distance and time to get your running pace per mile and per kilometre, plus your speed.
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P-Value Calculator
Convert a z-score into a one- or two-tailed p-value from the normal distribution.
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Ovulation Calculator
Estimate your fertile window and ovulation day from your last period and cycle length.
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Overweight Calculator
Check your BMI and weight category, with the healthy weight range for your height.