September 22, 2026
Omni Calculator's discount tool gets the math right, but like the rest of that site, it's a generic utility with no context for a business actually planning a sale or promotion.
Both tools do the same core arithmetic: apply a discount percentage to a price, or run it in reverse to find the original price before a markdown. The formula doesn't change no matter which site does the calculating — Sale Price = Original Price × (1 − Discount%), and the reverse for working backward.
SMBkits' version is built into a set of pricing tools small business owners actually use together — profit margin, markup, sales tax — so you're not bouncing between a dozen unrelated calculators on a generalist site to plan a single promotion. Planning a seasonal sale usually means checking the discounted price, then checking what margin survives after that discount, then checking tax on top — three separate calculations that live on three separate tools on a generalist site, but one connected set on SMBkits.
That connectedness matters more than it sounds: a 30% discount that looked fine against your retail price can quietly wipe out your entire margin once you check it against your actual cost, and catching that before the sale goes live — not after — is the whole point of running the numbers in sequence rather than in isolation.
If you just need one quick discount number, either tool works equally well. If you're planning an actual promotion and want to check the downstream effect on margin, having both calculators in the same toolset saves the re-entry step.
| Feature | SMBkits | Omni Calculator |
|---|---|---|
| Discount math | Standard formula | Standard formula (identical) |
| Reverse calculation (find original price) | Included | Included |
| Connected margin/tax tools | Yes, same toolset | Separate, unrelated calculators |
| Ads on page | None | Ad-supported |
Yes — the tool supports both directions: discount percentage to sale price, and sale price back to the original pre-discount price.
No — it calculates the discount on the price you enter. If you need to add tax afterward, use the Sales Tax Calculator on the discounted price.
Check the discounted price against your actual cost using the Profit Margin Calculator before launching the sale — a discount that looks reasonable against your retail price can still leave a razor-thin or negative margin once cost is factored in.