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Consecutive Integer Sum Calculator — result sheet
Calculate the first and last integer and total sum for a run of consecutive integers.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Last=first+count−1; sum=count×(first+last)/2.
The result makes the sequence endpoints explicit before applying the arithmetic-series sum.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- First integer — minimum -1000000; maximum 1000000
- Number of integers — minimum 1; maximum 1000000
Worked example
| Input | Value |
|---|---|
| First integer | 3 |
| Number of integers | 5 |
Integers 3 through 7; sum =25.
Assumptions and limits
- The first value is a whole integer and the count is a positive whole number.
- Each successive term increases by exactly one.
- Overflow beyond safe JavaScript integer arithmetic is rejected by the bounds.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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