Benjamin Franklin’s will (1790) left £1,000 each to Boston and Philadelphia on 200-year compound-interest terms — the Boston fund reached $5 million in 1990.
§01What is
Understanding the FV Annuity Table
The FV Annuity Table computes FVIFA from 2 inputs: rate (%), periods. FVIFA table.
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The FV Annuity Table sits in that toolkit — it FVIFA table. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.
Apply the formula to a realistic set of inputs: Rate (%) = 5, Periods = 10.
01Start by noting the input — Rate (%): 5.
02Start by noting the input — Periods: 10.
03Substitute these values into the formula: {let t=e.r,a=e.n;return((1+t / 100)^(a)-1) / (t / 100)}
04Compute FVIFA: the calculator returns 12.5779.
05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants
Common FV Annuity Table Problems
The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.
01 · PATTERN
Rate (%) halved
r = 2.5 (from 5)
Keep every other input at its default and halve the rate (%). See how fvifa responds.
01New Rate (%): 2.5
02Baseline FVIFA: 12.5779
03New FVIFA: 11.2034
04FVIFA decreases by 10.9% → use this sensitivity to plan for real-world variation.
02 · PATTERN
Rate (%) doubled
r = 10 (from 5)
Keep every other input at its default and double the rate (%). See how fvifa responds.
01New Rate (%): 10
02Baseline FVIFA: 12.5779
03New FVIFA: 15.9374
04FVIFA increases by 26.7% → use this sensitivity to plan for real-world variation.
03 · PATTERN
Periods halved
n = 5 (from 10)
Keep every other input at its default and halve the periods. See how fvifa responds.
01New Periods: 5
02Baseline FVIFA: 12.5779
03New FVIFA: 5.52563
04FVIFA decreases by 56.1% → use this sensitivity to plan for real-world variation.
04 · PATTERN
Periods doubled
n = 20 (from 10)
Keep every other input at its default and double the periods. See how fvifa responds.
01New Periods: 20
02Baseline FVIFA: 12.5779
03New FVIFA: 33.066
04FVIFA increases by 162.9% → use this sensitivity to plan for real-world variation.
§05FAQ
Frequently asked questions
Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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