.df-calculator-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
background: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.df-calc-container {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 30px;
margin-bottom: 40px;
background-color: #f9fbfd;
padding: 30px;
border-radius: 12px;
border: 1px solid #e1e8ed;
}
.df-input-group {
margin-bottom: 20px;
}
.df-input-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #2c3e50;
}
.df-input-group input, .df-input-group select {
width: 100%;
padding: 12px;
border: 1px solid #cbd5e0;
border-radius: 6px;
font-size: 16px;
transition: border-color 0.2s;
}
.df-input-group input:focus {
border-color: #3498db;
outline: none;
box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}
.df-btn {
background-color: #e67e22;
color: white;
border: none;
padding: 15px 30px;
font-size: 18px;
font-weight: bold;
border-radius: 6px;
cursor: pointer;
width: 100%;
transition: background-color 0.2s;
grid-column: span 2;
}
.df-btn:hover {
background-color: #d35400;
}
.df-results {
grid-column: span 2;
background: #fff;
border-radius: 8px;
padding: 20px;
display: none;
border: 1px solid #e1e8ed;
margin-top: 20px;
}
.df-result-row {
display: flex;
justify-content: space-between;
align-items: center;
padding: 12px 0;
border-bottom: 1px solid #eee;
}
.df-result-row:last-child {
border-bottom: none;
}
.df-result-label {
color: #7f8c8d;
font-size: 14px;
}
.df-result-value {
font-size: 20px;
font-weight: 700;
color: #2c3e50;
}
.df-big-result {
text-align: center;
margin-bottom: 20px;
padding-bottom: 20px;
border-bottom: 2px solid #f0f0f0;
}
.df-big-result .val {
font-size: 42px;
color: #e67e22;
font-weight: 800;
display: block;
}
.df-big-result .lbl {
font-size: 16px;
color: #7f8c8d;
text-transform: uppercase;
letter-spacing: 1px;
}
.df-content {
margin-top: 40px;
color: #444;
line-height: 1.6;
}
.df-content h2 {
color: #2c3e50;
margin-top: 30px;
}
.df-content h3 {
color: #e67e22;
}
.df-tip-box {
background: #fff3cd;
border-left: 5px solid #ffc107;
padding: 15px;
margin: 20px 0;
}
@media (max-width: 600px) {
.df-calc-container {
grid-template-columns: 1fr;
}
.df-btn {
grid-column: span 1;
}
.df-results {
grid-column: span 1;
}
}
function calculateDogFood() {
// 1. Get Inputs
var weight = parseFloat(document.getElementById('bagWeight').value);
var price = parseFloat(document.getElementById('bagPrice').value);
var dailyCups = parseFloat(document.getElementById('cupsPerDay').value);
var meals = parseFloat(document.getElementById('mealsPerDay').value);
// Validation
if (isNaN(weight) || weight <= 0) {
alert("Please enter a valid bag weight.");
return;
}
if (isNaN(dailyCups) || dailyCups <= 0) {
alert("Please enter the daily feeding amount.");
return;
}
if (isNaN(price)) price = 0;
if (isNaN(meals) || meals 0) {
costPerDay = price / daysLasting;
costPerMeal = costPerDay / meals;
}
var weeksLasting = daysLasting / 7;
// Calculate restock date
var today = new Date();
var restockDate = new Date();
restockDate.setDate(today.getDate() + Math.floor(daysLasting));
// 3. Output Results
document.getElementById('resDays').innerText = Math.floor(daysLasting);
document.getElementById('resWeeks').innerText = weeksLasting.toFixed(1) + " weeks";
document.getElementById('resTotalCups').innerText = totalCups.toFixed(1) + " cups";
document.getElementById('resCostPerDay').innerText = "$" + costPerDay.toFixed(2);
document.getElementById('resCostPerMeal').innerText = "$" + costPerMeal.toFixed(2);
// Format date nicely
var options = { weekday: 'short', year: 'numeric', month: 'short', day: 'numeric' };
document.getElementById('resRestockDate').innerText = restockDate.toLocaleDateString("en-US", options);
// Show results container
document.getElementById('dfResults').style.display = "block";
}
How Long Does a Bag of Dog Food Last?
Planning your dog's nutrition and your monthly budget requires knowing exactly how long that large bag of kibble will last in the pantry. Whether you are buying a 30lb bag of premium food or a smaller 5lb bag, understanding the consumption rate helps prevent running out of food unexpectedly.
How the Calculator Works
This calculator uses a standard density conversion for dry dog food (kibble). While kibble sizes vary, the general industry rule is that 1 pound of dry dog food contains approximately 4 cups of food. This can vary slightly between 3.5 to 4.5 cups depending on the brand and kibble size, but 4 cups is the most reliable baseline for estimation.
Pro Tip: To get the most accurate result, check the "Serving Size" label on your specific dog food bag. It often lists grams per cup. If you know the total weight in grams, you can divide by the daily grams needed for exact precision.
Factors That Affect Consumption
- Activity Level: Highly active dogs require more calories per pound of body weight than sedentary dogs.
- Life Stage: Puppies and nursing mothers consume food much faster than senior dogs.
- Kibble Density: "Performance" or high-protein blends are often denser, meaning fewer cups per pound, while "Weight Management" blends may be lighter (more air) to add volume.
Why Calculate "Cost Per Day"?
Many dog owners experience "sticker shock" when buying a $70 or $90 bag of food. However, the price of the bag is less important than the Price Per Day. A cheap bag of food often contains fillers (corn, wheat) requiring you to feed 4 cups a day, whereas a premium bag might only require 2 cups a day.
Using the calculator above, you might find that the expensive bag actually lasts twice as long, making the daily cost identical to the cheaper brand.
Food Storage & Freshness
Even if a 40lb bag is cheaper per pound, it might not be the best choice for a small dog. Once opened, fats in dog food can start to turn rancid after 4 to 6 weeks depending on storage conditions. If the calculator shows your bag will last 90+ days, consider buying smaller bags to ensure your dog is eating fresh, healthy food.