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Price Per Unit Comparison

Compare products by price per unit to find the best value when shopping.

Product 1
Price per Unit/g
0.007980
Product 2
Price per Unit/g
0.006490Best Value
Product 3
Price per Unit/g
0.007633

Summary

Product NamePriceQuantityPrice per Unit
Brand B6.491 kg0.006490/g✓
Brand C2.29300 g0.007633/g
Brand A3.99500 g0.007980/g

About this tool

When shopping for value, comparing prices per unit is the smart way to make informed purchasing decisions. A seemingly cheaper product might actually cost more per unit than its pricier competitor, making the larger size the real bargain. This tool cuts through confusing pricing by calculating exactly how much you're paying for each unit—whether it's per ounce, per liter, per kilogram, or any other measurement—so you can spot true value at a glance.

Using this calculator is simple: select your unit of measurement, enter the product size or quantity and its price, then instantly compare multiple products to find which one offers the best value. Whether you're comparing different package sizes of the same product or evaluating alternatives from competing brands, the tool displays the cost per unit clearly, eliminating guesswork and revealing which purchase gives you the most for your money.

This is invaluable for budget-conscious shoppers, families buying groceries, and anyone who wants to stretch their dollar further. With this tool, you can confidently shop in bulk knowing you're actually getting a deal, or quickly spot when a smaller package is worth buying despite its higher upfront cost. It transforms price comparison from a mental arithmetic challenge into a transparent, instant calculation.

Frequently Asked Questions

Code Implementation

def price_per_unit(price: float, quantity: float, unit: str) -> float:
    """Calculate price per base unit (grams or ml)."""
    conversions = {
        'g': 1, 'kg': 1000, 'oz': 28.3495, 'lb': 453.592,
        'ml': 1, 'l': 1000, 'fl oz': 29.5735, 'pt': 473.176,
    }
    factor = conversions.get(unit.lower(), 1)
    base_qty = quantity * factor
    return price / base_qty if base_qty > 0 else float('inf')

products = [
    {"name": "Brand A", "price": 2.99, "quantity": 500, "unit": "g"},
    {"name": "Brand B", "price": 4.49, "quantity": 1,   "unit": "kg"},
    {"name": "Brand C", "price": 1.79, "quantity": 12,  "unit": "oz"},
]

results = [(p["name"], price_per_unit(p["price"], p["quantity"], p["unit"])) for p in products]
results.sort(key=lambda x: x[1])

print("Price per gram (sorted cheapest first):")
for name, ppu in results:
    print(f"  {name}: ${ppu*100:.4f} per 100g")

best = results[0]
print(f"\nBest value: {best[0]}")

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