Security Deposit Interest Calculator
ANA›Life Services Authority›National Calculator Authority›Security Deposit Interest Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Security Deposit Interest Calculator
Calculate the interest accrued on a security deposit over a rental period using simple or compound interest.
Security Deposit Amount ($)
Annual Interest Rate (%)
Rental Period (Years)
Additional Months
Interest Type
Simple Interest Compound Interest (Annually) Compound Interest (Monthly)
Calculate
function secCalc() { var deposit = parseFloat(document.getElementById('sec-deposit').value); var rate = parseFloat(document.getElementById('sec-rate').value); var years = parseFloat(document.getElementById('sec-years').value) || 0; var months = parseFloat(document.getElementById('sec-months').value) || 0; var type = document.getElementById('sec-type').value; var result = document.getElementById('sec-result');
// --- Validation --- if (isNaN(deposit) || deposit ⚠ Please enter a valid security deposit amount greater than 0.'; return; } if (isNaN(rate) || rate ⚠ Please enter a valid annual interest rate (0 or greater).'; return; } if (years ⚠ Rental period cannot be negative.'; return; } if (months > 11) { result.style.display = 'block'; result.innerHTML = '⚠ Additional months must be between 0 and 11.'; return; } var totalYears = years + (months / 12); if (totalYears ⚠ Total rental period must be greater than 0.'; return; }
var r = rate / 100; var interest = 0; var totalAmount = 0; var formula = '';
if (type === 'simple') { // Simple Interest: I = P * r * t interest = deposit * r * totalYears; totalAmount = deposit + interest; formula = 'Simple Interest: I = P × r × t'; } else if (type === 'compound') { // Compound Interest (Annually): A = P * (1 + r)^t totalAmount = deposit * Math.pow(1 + r, totalYears); interest = totalAmount - deposit; formula = 'Compound Interest (Annual): A = P × (1 + r)t'; } else if (type === 'compound_monthly') { // Compound Interest (Monthly): A = P * (1 + r/12)^(12*t) totalAmount = deposit * Math.pow(1 + r / 12, 12 * totalYears); interest = totalAmount - deposit; formula = 'Compound Interest (Monthly): A = P × (1 + r/12)12t'; }
var periodStr = ''; if (years > 0 && months > 0) periodStr = years + ' yr ' + months + ' mo'; else if (years > 0) periodStr = years + ' year(s)'; else periodStr = months + ' month(s)';
result.style.display = 'block'; result.innerHTML = '### Results ' + '' + 'Security Deposit$' + deposit.toFixed(2) + '' + 'Annual Rate' + rate.toFixed(2) + '%' + 'Rental Period' + periodStr + '' + 'Interest Type' + (type === 'simple' ? 'Simple' : type === 'compound' ? 'Compound (Annual)' : 'Compound (Monthly)') + '' + 'Interest Earned$' + interest.toFixed(2) + '' + 'Total Amount Returnable$' + totalAmount.toFixed(2) + '' + '' + 'Formula used: ' + formula + '
'; }
#### Formulas
Simple Interest: I = P × r × t A = P + I
Compound Interest (Annually): A = P × (1 + r)t I = A − P
Compound Interest (Monthly): A = P × (1 + r/12)12t I = A − P
Where: P = Principal (deposit), r = Annual interest rate (decimal), t = Time in years, I = Interest earned, A = Total amount.
#### Assumptions & References
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