#generation-calculator {
max-width: 500px;
margin: 20px auto;
padding: 15px;
background: #fff;
border-radius: 5px;
box-shadow: 0 1px 3px rgba(0,0,0,0.1);
font-family: -apple-system, BlinkMacSystemFont, ‘Arial’, sans-serif;
color: #333;
box-sizing: border-box;
}
h2 {
text-align: center;
margin: 0 0 15px;
font-size: 1.4rem;
line-height: 1.2;
color: #333;
}
.form-group {
margin-bottom: 15px;
}
label {
display: block;
margin-bottom: 5px;
font-size: 0.9rem;
font-weight: 600;
}
input[type=”number”], select {
width: 100%;
padding: 8px;
border: 1px solid #ddd;
border-radius: 3px;
font-size: 0.9rem;
box-sizing: border-box;
}
input:focus, select:focus {
border-color: #0073aa;
outline: none;
}
.unit-toggle {
display: flex;
gap: 10px;
margin-top: 5px;
font-size: 0.85rem;
}
.tooltip {
position: relative;
display: inline-block;
margin-left: 5px;
}
.tooltip .tooltip-text {
visibility: hidden;
width: 160px;
background: #333;
color: #fff;
text-align: center;
border-radius: 3px;
padding: 5px;
position: absolute;
z-index: 10;
bottom: 125%;
left: 50%;
transform: translateX(-50%);
opacity: 0;
transition: opacity 0.3s;
font-size: 0.75rem;
}
.tooltip:hover .tooltip-text {
visibility: visible;
opacity: 1;
}
.button-group {
display: flex;
gap: 10px;
justify-content: center;
margin-top: 15px;
}
button {
padding: 8px 16px;
border: none;
border-radius: 3px;
cursor: pointer;
font-size: 0.9rem;
background: #0073aa;
color: #fff;
}
button:hover {
background: #005177;
}
#reset-btn {
background: #6c757d;
}
#reset-btn:hover {
background: #5a6268;
}
#result {
margin-top: 15px;
padding: 10px;
border-radius: 3px;
font-size: 0.9rem;
line-height: 1.4;
min-height: 20px;
}
#result.success {
background: #e6f4ea;
border: 1px solid #28a745;
}
#result.error {
background: #f8d7da;
border: 1px solid #dc3545;
}
.result-table {
width: 100%;
border-collapse: collapse;
margin-top: 10px;
}
.result-table th, .result-table td {
padding: 8px;
border: 1px solid #ddd;
text-align: left;
font-size: 0.85rem;
}
.result-table th {
background: #f8f9fa;
font-weight: 600;
}
noscript {
display: block;
color: #dc3545;
text-align: center;
margin-top: 10px;
font-size: 0.9rem;
}
@media (max-width: 500px) {
#generation-calculator {
margin: 10px;
padding: 10px;
}
h2 {
font-size: 1.2rem;
}
.button-group {
flex-direction: column;
}
button {
width: 100%;
}
.result-table th, .result-table td {
font-size: 0.8rem;
padding: 6px;
}
}
Generation Time: ${generationTimeMinutes.toFixed(1)} minutes (${generationTimeHours.toFixed(2)} hours)
Number of Generations: ${generations.toFixed(2)}
Growth Rate: ${growthRate.toFixed(2)} generations/hour
Summary:
Interpretation:
${interpretation} `; resultDiv.className = ‘success’; } catch (error) { resultDiv.innerHTML = `Error: ${error.message}`; resultDiv.className = ‘error’; } } function reset() { form.reset(); resultDiv.className = ”; resultDiv.innerHTML = ‘Enter population and time details, then click “Calculate”.’; form.querySelector(‘input[name=”unit”][value=”minutes”]’).checked = true; initialPopInput.focus(); } document.getElementById(‘calculate-btn’).addEventListener(‘click’, calculate); document.getElementById(‘reset-btn’).addEventListener(‘click’, reset); form.addEventListener(‘keypress’, function(e) { if (e.key === ‘Enter’ && e.target.tagName !== ‘BUTTON’) { e.preventDefault(); calculate(); } }); })();
Generation Time Calculator
Enter population and time details, then click “Calculate”.
JavaScript is disabled. Please enable it to use the calculator.
(function() {
if (!document.getElementById(‘generation-calculator’)) return;
const form = document.getElementById(‘calc-form’);
const initialPopInput = document.getElementById(‘initial-pop’);
const finalPopInput = document.getElementById(‘final-pop’);
const timeElapsedInput = document.getElementById(‘time-elapsed’);
const resultDiv = document.getElementById(‘result’);
function calculate() {
resultDiv.className = ”;
resultDiv.innerHTML = ”;
try {
const initialPop = parseInt(initialPopInput.value);
const finalPop = parseInt(finalPopInput.value);
const timeElapsed = parseFloat(timeElapsedInput.value);
const unit = form.querySelector(‘input[name=”unit”]:checked’).value;
if (isNaN(initialPop) || initialPop < 1) throw new Error('Initial population must be a positive integer.');
if (isNaN(finalPop) || finalPop < 1) throw new Error('Final population must be a positive integer.');
if (isNaN(timeElapsed) || timeElapsed <= 0) throw new Error('Time elapsed must be positive.');
if (finalPop < initialPop) throw new Error('Final population must be greater than initial population.');
const timeInMinutes = unit === 'hours' ? timeElapsed * 60 : timeElapsed;
const generations = (Math.log(finalPop) – Math.log(initialPop)) / Math.log(2);
if (generations <= 0) throw new Error('Invalid growth data: check population values.');
const generationTimeMinutes = timeInMinutes / generations;
const generationTimeHours = generationTimeMinutes / 60;
const growthRate = generations / (timeInMinutes / 60);
let interpretation = '';
if (generationTimeMinutes < 20) {
interpretation = 'Very fast growth, typical of optimal conditions (e.g., E. coli in rich media).';
} else if (generationTimeMinutes < 60) {
interpretation = 'Moderate growth, common in standard lab conditions.';
} else {
interpretation = 'Slow growth, possibly due to nutrient limits or stress.';
}
resultDiv.innerHTML = `
Generation Time Results:Generation Time: ${generationTimeMinutes.toFixed(1)} minutes (${generationTimeHours.toFixed(2)} hours)
Number of Generations: ${generations.toFixed(2)}
Growth Rate: ${growthRate.toFixed(2)} generations/hour
Summary:
| Parameter | Value |
|---|---|
| Initial Population | ${initialPop.toLocaleString()} |
| Final Population | ${finalPop.toLocaleString()} |
| Time Elapsed | ${timeElapsed} ${unit} |
| Generation Time | ${generationTimeMinutes.toFixed(1)} min |
| Growth Rate | ${growthRate.toFixed(2)} gen/h |
Interpretation:
${interpretation} `; resultDiv.className = ‘success’; } catch (error) { resultDiv.innerHTML = `Error: ${error.message}`; resultDiv.className = ‘error’; } } function reset() { form.reset(); resultDiv.className = ”; resultDiv.innerHTML = ‘Enter population and time details, then click “Calculate”.’; form.querySelector(‘input[name=”unit”][value=”minutes”]’).checked = true; initialPopInput.focus(); } document.getElementById(‘calculate-btn’).addEventListener(‘click’, calculate); document.getElementById(‘reset-btn’).addEventListener(‘click’, reset); form.addEventListener(‘keypress’, function(e) { if (e.key === ‘Enter’ && e.target.tagName !== ‘BUTTON’) { e.preventDefault(); calculate(); } }); })();