Price per 100g Calculator

What is price per 100g?

Price per 100 grams is a standardized way to compare the cost of food and consumer products regardless of packaging size. Instead of guessing whether a 200g pack for $3.50 is cheaper than a 500g pack for $7.99, converting both to price per 100g reveals the truth instantly.

Retailers often use different weights, shapes, and marketing labels to make comparison difficult. The price per 100g method removes that confusion by giving every product the same reference unit.

The formula

Price per 100g = (Product price ÷ Weight in grams) × 100

If the weight is given in kilograms, it is first converted to grams (1 kg = 1000 g).

Example calculation

• Price: $4.99
• Weight: 250g

4.99 ÷ 250 × 100 = $1.996 per 100g

Now compare that with another brand priced at $8.49 for 500g:

8.49 ÷ 500 × 100 = $1.698 per 100g

Even though the second product costs more overall, it is cheaper per 100g.

When should you use a price per 100g calculator?

• Comparing groceries in supermarkets
• Evaluating bulk vs small pack offers
• Online shopping comparisons
• Budget planning for households
• Meal prep and cooking cost estimates

This method is especially powerful when brands use different package sizes to hide true costs.

Common mistakes shoppers make

• Assuming larger packs are always cheaper
• Comparing prices without standard units
• Ignoring weight differences
• Falling for “family pack” labels

Frequently Asked Questions

• Is price per 100g better than price per kg?
  Both work, but 100g is easier for quick mental comparison.
• Does this work for liquids?
  Yes, when density is close to water or clearly labeled.
• Why not just trust store labels?
  Labels vary by country and are often inconsistent.