When to use this calculator
Add all positive integers up to a chosen upper limit. Uses the whole-number sequence beginning at one.
Explore the algebra & number calculators for other questions in this topic. For a related calculation, use the Sum of Squares Calculator: Add squared integers from one through a selected whole number.
PUTTING IT INTO PRACTICE
Sum of Integers: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Upper integer | 100 |
| Result | 5,050 |
- Check the input labels and enter the example values above.
- Apply the relationship: Sum 1 to n = n(n+1)/2.
- The result is 5,050 , rounded for display.
How to interpret your result
Uses the whole-number sequence beginning at one.
Identify whether the question asks for one term, a total or a count of possible selections. Sequences use a fixed difference or ratio. In counting problems, order and replacement determine the correct model.
Frequently asked questions
Do combinations and permutations count the same thing?
No. Combinations ignore the order of selection; permutations count different orders separately.
When is the sum of integers calculator useful?
Add all positive integers up to a chosen upper limit. Uses the whole-number sequence beginning at one.
How do I use the sum of integers calculator?
Enter upper integer. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Sum 1 to n = n(n+1)/2.
What should I check before using the result?
Uses the whole-number sequence beginning at one.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Calculators Map editorial process · Updated · Methods and limitations