What I checked
The calculator uses ordinary arithmetic: sale price minus unit cost, and that difference divided by sale price. allthings.how reports a roughly 70% margin target. Interpreting that as gross margin gives price = cost / 0.3; it is not a developer-published pricing rule. There is no tested demand forecast or net company-profit model on this page.
How to use the result
If your margin is far from the reported 70 percent, that is a prompt to read sales, not an error. The money guide explains price changes after launch. The best phone guide explains which lever changed the cost.
Marketing spends cash on top of unit cost. The reported tiers are $0, $40,000, $400,000, and $1,300,000. Those are campaign costs, not part of unit cost, so do not type them into the cost field unless you are doing a one-off experiment you understand.
A repeat design can sell fewer units at the same margin. Margin and volume are different. See selling phones.
Sources
- allthings.how — Single-source 70 percent margin target and reported marketing costs. The algebra on this page is ordinary gross-margin arithmetic.
- Roonby — Price can change after launch.
FAQ
Does a 70% margin guarantee profit?
No. It is a per-unit target from guides. Wages and ads can still make the company poorer. Volume is unknown.
Can I share my numbers?
Yes. Cost and price are written to the query string as you type.
Why is there no sales box?
This tool does not estimate sales. A unit-sales forecast would need a demand formula that is not established by the cited sources.