Round a target price down to the nearest .99, .95, or .49 ending and see how much revenue per sale you give up.
All calculations run in your browser. Nothing is sent to a server. Last updated: 2026-07-19 · Formula verified against published sources (see below).
Charm pricing — ending prices in .99, .95, or .49 — exploits the left-digit effect: customers read the leftmost digit first, so $39.99 feels meaningfully cheaper than $40.00 even though the difference is $0.01. Multiple A/B tests have shown 5–15% conversion lifts from charm pricing.
Charm price = floor(target price) + ending
If the result is ≥ target price (e.g. target $40.50, ending .99 → $40.99 > $40.50), the calculator rounds down to the previous whole number ($39.99).
Charm pricing gives up a small amount of revenue per sale in exchange for higher conversion. This calculator shows exactly how much revenue you're giving up — useful for sanity-checking whether the conversion lift is worth it. If you're giving up $0.50 per order on 100 orders/month, that's $600/year in revenue sacrificed. The conversion lift needs to deliver more than $600 in additional profit to be worth it.
| Input | Value |
|---|---|
| Target price | $40.00 |
| Charm ending | .99 |
| Charm price | $39.99 |
| Revenue given up per sale | $0.01 |
| Annual revenue given up (100 orders/mo) | $12.00 |
The cost of charm pricing here is trivial — $12/year. Even a 0.1% conversion lift would pay for it. This is why charm pricing is almost universal in ecommerce.
But for a $40.50 target, the math changes: charm pricing gives $39.99 (sacrificing $0.51/sale = $612/year). Still usually worth it, but check.
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