AP & GP Calculator
By MD Altaf
Calculate Arithmetic and Geometric Progressions fast
Enter any two or three known values and get terms, nth term, partial sums, and a preview sequence.
Arithmetic Progression
APKey results
nth term (Tn)
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Sum of k terms (Sk)
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kth term (Tk)
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First 10 terms preview
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Geometric Progression
GPKey results
nth term (Tn)
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Sum of k terms (Sk)
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kth term (Tk)
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First 10 terms preview
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How it works
- AP: Tn = a + (n - 1) d, Sk = k/2 [2a + (k - 1)d]
- GP: Tn = a · r^(n - 1), Sk = a(1 - r^k)/(1 - r) when r ≠ 1. If r = 1, Sk = a·k.
- Enter what you know. If something is blank, it’s simply not used.
- Preview shows the first 10 terms based on a and the step/ratio.