About Distribution Calculator
Distribution Calculator is an Android calculator for working with uncertain quantities. Instead of entering a single value, users can represent an estimate with a range and combine several inputs to see how uncertainty affects the result. The calculator presents the 90 percent confidence interval of a distribution, from the fifth to the ninety-fifth percentile. Inputs can be duplicated with a swipe, which makes it easier to extend a calculation with repeated factors. The product description illustrates a multi-step Fermi estimate, combining ranges for physical quantities, repetitions, time, and uncertain conversion factors to estimate an outcome. The app is intended to make such chained estimates more ergonomic than treating every input as a precise number. Distribution Calculator can be used for rough estimates where measurements or assumptions are uncertain. Its output reflects the ranges and assumptions entered by the user, so the result is only as meaningful as those inputs. The tool helps represent uncertainty in a calculation; it does not determine whether an assumption is correct.
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