Shampoo bar brands all claim to be the most economical choice, but the math looks different once you factor in list price and how many washes you actually get. Here is how Viori, Ethique, and KITSCH stack up on cost per wash in 2026 - using the same formula our calculator runs.
How we compare cost per wash
Cost per wash is straightforward: divide the bar price by the number of washes it delivers. The tricky part is the wash count. Brand websites often cite best-case figures; real-world results tend to run lower. We use brand-published estimates as the ceiling and a more conservative everyday figure as the floor, then show the range.
One variable that moves the number a lot is technique. Lathering the bar in your hands before applying - rather than rubbing it directly on your hair - can extend bar life by roughly 1.5x according to Viori. We apply that multiplier to the raw wash count where brands confirm it applies.
Viori: $16.95 bar, $0.11-0.17 per wash
Viori's Hidden Waterfall and Citrus Yao bars list at around $16.95 each. Viori cites up to 80 washes per bar with hands-lather technique; real-world everyday use tends to land closer to 55-65 washes. At 65 raw washes with the 1.5x hands-lather bonus (about 98 effective washes), the cost per wash works out to roughly $0.17. At the brand's optimistic 80-wash ceiling with the bonus, it drops to about $0.14.
That puts Viori firmly in the mid-range on price per bar but competitive on a per-wash basis because its wash count is strong.
Ethique: $15-18 bar, $0.15-0.30 per wash
Ethique bars are priced roughly $15-18 depending on the product line. The brand publishes wash estimates of 60-80 per bar. Using a conservative 60-wash figure on a $15 bar gives about $0.25 per wash - on the higher end. Push the wash count to 80 and the price drops to $0.19. Apply the hands-lather multiplier and you can reach $0.15-0.19 per wash.
Ethique's eco credentials and plastic-neutral positioning add non-monetary value, but on raw cost per wash it benefits most from disciplined technique to bring the number down.
KITSCH: roughly $0.14 per wash at optimal use
KITSCH publishes a notably aggressive figure: roughly $0.14 per wash, based on about 100 washes per bar for their bars priced around $14. That assumes careful storage and hands-lather technique. At a more conservative 70-75 real-world washes the per-wash cost climbs to about $0.19-0.20, which is still competitive.
KITSCH bars are widely available at drugstores and online, which lowers shipping friction compared to DTC-only brands. Their lower sticker price makes the per-wash cost forgiving even at suboptimal wash counts.
How all three compare to a drugstore liquid
A typical drugstore liquid - say an $8 bottle good for 45 washes - runs about $0.18 per wash. All three bar brands can beat that figure at mid-range or better usage. The comparison flips only if you buy a cheap value bottle under $6 or use fewer washes per bar than average.
Premium liquids like Olaplex or Briogeo at $25-38 per bottle (40-50 washes) cost $0.50-0.75 per wash - two to four times the bar cost. For anyone currently buying premium liquid, the switch to any of the three bar brands here shows clear annual savings. Use the calculator with your actual prices to see your specific number.