Skip Counting Calculator

Work out skip counting instantly with clear inputs, formula shown and shareable results.

About Skip Counting Calculator

Skip counting is an arithmetic progression: the nth term is start plus (n - 1) times the step, and the total is n times the average of first and last. Skip counting in threes, fours and fives is the scaffold for multiplication tables, and writing the sequence out makes the repeating units digit pattern obvious.

Formulas

nth term

term(n) = start + (n - 1) x step

Sum of terms

sum = n x (first + last) / 2

Worked example

With the default values below, Skip Counting Calculator returns Last number in the sequence of 36.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Start at: 3
Count in steps ofminimum 1: 3
How many numbersaccepts 1–60: 12

Results

Last number in the sequence: 36.00
The sequence: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36
Total of the sequence: 234.00

Step by step

1Values used
2nth term
3Sum of terms
4Last number in the sequence= 36.00
5The sequence= 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36
6Total of the sequence= 234.00

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Skip Counting figure worked out?

term(n) = start + (n - 1) x step. Skip counting is an arithmetic progression: the nth term is start plus (n - 1) times the step, and the total is n times the average of first and last.

Why does this matter?

Skip counting in threes, fours and fives is the scaffold for multiplication tables, and writing the sequence out makes the repeating units digit pattern obvious.

What do I need to enter?

Enter start at, count in steps of, how many numbers. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.