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IFDM-158: Client feedback on Compounding Frequency calculator #104

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IFDM-158: Client feedback on Compounding Frequency calculator #104

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jenbreese May 5, 2026
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IFDM-158: Client feedback fixes
jenbreese May 5, 2026
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51 changes: 23 additions & 28 deletions app/interactives/compounding-frequency-calculator/page.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -29,10 +29,6 @@ function formatCurrency(value: number): string {
}).format(value)
}

function formatNumber(value: number): string {
return Math.round(value).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")
}

function calculateCompoundInterest(
principal: number,
rate: number,
Expand All @@ -46,19 +42,6 @@ function calculateCompoundInterest(
return { finalAmount, interestEarned, totalPeriods }
}

function formatTimePeriod(totalPeriods: number, periodsPerYear: number): string {
const totalYears = totalPeriods / periodsPerYear
const years = Math.floor(totalYears)
const remainingPeriods = totalPeriods - (years * periodsPerYear)
const months = Math.round((remainingPeriods / periodsPerYear) * 12)

if (years === 0 && months === 0) return "0 months"
if (years === 0) return `${months} month${months !== 1 ? 's' : ''}`
if (months === 0) return `${years} year${years !== 1 ? 's' : ''}`

return `${years} year${years !== 1 ? 's' : ''} and ${months} month${months !== 1 ? 's' : ''}`
}

export default function CompoundInterestCalculator() {
const [initialAmount, setInitialAmount] = useState<string>("")
const [annualRate, setAnnualRate] = useState<string>("")
Expand All @@ -78,11 +61,6 @@ export default function CompoundInterestCalculator() {
return calculateCompoundInterest(principal, rate, totalPeriods, selectedOption.periodsPerYear)
}, [principal, rate, totalPeriods, selectedOption.periodsPerYear])

const formattedTimePeriod = useMemo(() =>
formatTimePeriod(totalPeriods, selectedOption.periodsPerYear),
[totalPeriods, selectedOption.periodsPerYear]
)

const comparisonResults = useMemo(() => {
const timeInYears = totalPeriods / selectedOption.periodsPerYear
return compoundingOptions.map((option) => {
Expand Down Expand Up @@ -152,9 +130,6 @@ export default function CompoundInterestCalculator() {
className="font-bold block w-full rounded-md shadow-sm py-2 px-3 border pr-10 [appearance:textfield] [&::-webkit-outer-spin-button]:appearance-none [&::-webkit-inner-spin-button]:appearance-none"
min="0"
/>
<p className="text-sm text-foreground mt-2">
{totalPeriods > 0 && `${formatNumber(totalPeriods)} ${selectedOption.label.toLowerCase()} periods = ${formattedTimePeriod}`}
</p>
</div>
</div>

Expand Down Expand Up @@ -185,9 +160,29 @@ export default function CompoundInterestCalculator() {
{/* Results Section */}
<Card className="w-full lg:w-1/2 bg-[var(--card-background)] rounded-3xl p-[32px]">
<CardContent className="p-0">
<p className="text-[20px] font-bold mb-1">Balance after {formattedTimePeriod}</p>
<p className="text-[20px] font-bold mb-1">Balance after {periods}
{
selectedCompounding === 'daily' ? ' days' :
selectedCompounding === 'weekly' ? ' weeks' :
selectedCompounding === 'biweekly' ? ' bi-weekly periods' :
selectedCompounding === 'monthly' ? ' months' :
selectedCompounding === 'quarterly' ? ' quarters' :
selectedCompounding === 'semi-annually' ? ' semi-annual periods' :
selectedCompounding === 'annually' ? ' years' :
selectedCompounding}
</p>
<p className="text-3xl font-bold text-lagunita mb-5">{formatCurrency(selectedResult.finalAmount)}</p>
<p className="text-[16px] font-semibold mb-1">Interest Earned over {formattedTimePeriod}</p>
<p className="text-[16px] font-semibold mb-1">Interest accrued over {periods}
{
selectedCompounding === 'daily' ? ' days' :
selectedCompounding === 'weekly' ? ' weeks' :
selectedCompounding === 'biweekly' ? ' bi-weekly periods' :
selectedCompounding === 'monthly' ? ' months' :
selectedCompounding === 'quarterly' ? ' quarters' :
selectedCompounding === 'semi-annually' ? ' semi-annual periods' :
selectedCompounding === 'annually' ? ' years' :
selectedCompounding}
</p>
<p className="text-3xl font-bold text-foreground">
{formatCurrency(selectedResult.interestEarned)}
</p>
Expand Down Expand Up @@ -228,7 +223,7 @@ export default function CompoundInterestCalculator() {
))}
</tbody>
</table>
<p className="pt-3 font-bold text-sm">Over the same time period, more frequent compounding generally results in more interest earned, assuming the annual interest rate stays the same.</p>
<p className="pt-3 font-bold text-sm">Over the same time period, more frequent compounding generally results in more interest accrued, assuming the annual interest rate stays the same.</p>
</div>
</section>

Expand Down