Streamflow Percentile Calculator

The reference set - all the scores in the class, or the historical record. Separate with commas, spaces or new lines.
The score, flow or reading whose position in the set you want.
Percentile rank of the value
50.00 %
Percentile Rank Calculator
Values below it
2
Values equal to it
1
Values above it
2
Values in the set
5
Value at the requested percentile
30.000000
Minimum
10.000000
Maximum
50.000000
What it means
30 sits at the 50th percentile of these 5 values: 2 are below it, 1 equal it and 2 are above it.
Worked out from NIST/SEMATECH e-Handbook of Statistical Methods, 7.2.6.2 Percentiles and 3 other sources.
With only 5 values each observation is worth 20 percentile points, so the rank is coarse.

How this is worked out

4 steps
  1. Sorted set (5 values): 10, 20, 30, 40, 50.
  2. 2 below the score, 1 equal to it, 2 above.
  3. PR = 100 x (2 + 0.5 x 1) / 5 = 50%.
  4. Going the other way, the 50th percentile of this set is 30.

Results are general information, not financial, tax, legal, medical or engineering advice.