Sum of a Linear Number Sequence Calculator

Your details

The starting value of the sequence.
The fixed amount added to each term to get the next. Use a negative number for a decreasing sequence.
How many terms to include in the sum. Must be a positive integer.
Sum of sequence
100

Total of all n terms in the sequence

Last term (aₙ)19
Average term10
Term range1.0000 to 19.0000
Total sum100
Last term19
Average term10

Sum of 10 terms: 100.0000

  • The sequence runs from 1 to 19.0000 across 10 terms, with each term increasing by 2.
  • The arithmetic mean of all terms is 10.0000, which equals half the sum of the first and last term.
  • For a quick sanity check: multiply the average (10.0000) by the count (10) to get the same sum.

Next stepTo find the sum of just a portion of the sequence, set the number of terms to the count you want. To extend the sequence, increase n.

 = Powered by OnlyCalculators