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Compute the percentage increase or decrease between two values quickly.
Find what percentage the first number represents of the second one.
Calculate the value when you take a given percentage of a number.
Count k-length sequences from n symbols when each position may repeat any symbol (n^k cases)
Count k-length ordered selections from n distinct items without reuse—the nPk partial permutation
Calculate maximum heart rate with the Astrand age-based regression formula.
Derive maximum heart rate with the Cerretelli age-based formula.
Find your Chinese zodiac animal and five-element cycle from a Gregorian birth date
Count multisets of size k from n types when the same element may appear more than once
Count unordered k-subsets from n distinct items without replacement—the binomial n choose k
Estimate max heart rate using the Cooper formula: 220 minus your age in years.
Predict peak heart rate using the Liesen formula from age and gender inputs.
Look up the Mayan calendar day sign (nawal) associated with your date of birth
Calculate max heart rate using the Mellerowicz age regression formula.
Split a prize pool into five tiers using percentages you set for each place.
Count permutations of multiset objects when symbols repeat within fixed-length patterns
Count ordered arrangements of n distinct items taken all at once—the factorial n! formula
Estimate maximum heart rate with the Tanaka 208 minus 0.7 times age formula.
Map a birth date to one of twelve Western tropical zodiac sun signs (Aries through Pisces)