Calculator Inputs and Outputs
Inputs
- First term — example: 2
- Last term — example: 20
- Number of terms — example: 10
Results
- Common ratio
- Reconstructed last term
Formula used
Common ratio = (last term ÷ first term)^(1 ÷ (number of terms − 1)).
How to Use the Geometric Sequence Common Ratio Calculator
- Enter each requested input using consistent units.
- Select Calculate Geometric Sequence Common Ratio.
- Review the primary answer and supporting results.
Inputs
- First term: enter a value in the shown unit.
- Last term: enter a value in the shown unit.
- Number of terms: enter a value in the shown unit.
Formula
Common ratio = (last term ÷ first term)^(1 ÷ (number of terms − 1)).
Results
- Common ratio.
- Reconstructed last term.
Accuracy and Limits
Use measured inputs and keep units consistent. Results are estimates and should be independently checked before financial, medical, construction, scientific, legal, or safety-critical decisions.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology