Nth Term Calculator
Arithmetic: aₙ = a₁ + (n − 1)d. Geometric: aₙ = a₁rⁿ⁻¹.
Inputs and units
- Sequence: Choose Arithmetic, Geometric.
- First term: Enter your value in the format and unit shown.
- Common difference or ratio: Enter your value in the format and unit shown.
- Term number n: Enter your value in the format and unit shown.
Calculation method
Arithmetic: aₙ = a₁ + (n − 1)d. Geometric: aₙ = a₁rⁿ⁻¹.
Worked example
The example values are: Sequence = arithmetic; First term = 3; Common difference or ratio = 2; Term number n = 10
- Term: 21
Assumptions and limitations
Check that the inputs and units describe your situation.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Nth Term Calculator FAQs
What method does this calculator use?
Arithmetic: aₙ = a₁ + (n − 1)d. Geometric: aₙ = a₁rⁿ⁻¹.
What should I check before using the result?
Check that the inputs and units describe your situation.