Arithmetic Series Sum
An arithmetic series adds a finite run of equally spaced terms. Pairing the first and last terms explains the compact sum formula.
Arithmetic Series Sum
Sequences · 3 inputs
How to use this calculator
- Enter first term in number.
- Enter common difference in number.
- Enter number of terms in count.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Choose the reference quantity before interpreting the number. A ratio, a percentage and a percentage-point difference may use the same observations while answering different questions. For recorded data, keep the original values beside the summary so an unexpected result can be traced back to its inputs.
The count is the number of included terms, not the number of gaps between them.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
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