Buying guides
How to compare shampoo bottle sizes and prices
Work out the price per 100 ml before deciding which bottle is better value.
Calculate the price per 100 ml
Divide the selling price by the volume in millilitres, then multiply by 100. A 400 ml bottle at ৳480 costs ৳120 per 100 ml. A 250 ml bottle at ৳325 costs ৳130 per 100 ml.
Compare like with like
Check that both products are the formula you want. Compare the effective price after discounts, and count only the bottles included in the purchase. A bottle with a lower unit price is not a saving if most of it goes unused.
Choose the size you will finish
A smaller pack can be useful when trying a new formula or packing for travel. If it’s a product you already use regularly, the larger pack may make sense when the unit price is lower.
