What this site is
Dropshipping House is a free hub of twenty calculators for the numbers that decide whether an ecommerce store makes money: profit margin, break-even ROAS and CPA, ad budgets, conversion rate, shipping costs, refunds, bundles, delivery windows and monthly planning. Each one sits on its own page with a written explanation of the formula, a worked example, benchmark ranges and the mistakes people most often make with that metric.
Who it is for
It is built for people who are actually running a store — beginners working out whether a product can support paid traffic, and experienced operators who want a quick, reliable calculation without opening a spreadsheet. The benchmarks quoted throughout are aimed at dropshipping and small ecommerce specifically, rather than generic retail figures that assume wholesale margins and warehouse fulfilment.
Why the tools are free
Because they cost almost nothing to run. Every calculation happens as JavaScript inside your browser, so there is no server processing your figures, no account to create, and no database holding anything you type. That removes the two usual reasons a tool site charges money or asks for an email address. There is no newsletter gate, no trial, and no premium tier hiding the useful features.
How the calculations are done
Each calculator is a small, self-contained function that takes your inputs and returns a result, written in plain JavaScript with no external libraries. The formulas are published on every page so you can check the arithmetic yourself rather than trusting a black box. Where a calculator needs a figure that changes over time — an exchange rate, a tax rate, a payment processor's pricing — you type it in yourself. Nothing is fetched from an external service, which means the tools work identically whether you are online or not, and the numbers reflect the rates you actually get rather than a headline figure.
Accuracy and limitations
The calculators are accurate to the formulas they publish, but a formula is only as good as the assumptions behind it. Benchmark ranges are guidance drawn from common ecommerce practice, not guarantees, and every category behaves differently. Treat the results as a starting point for a decision rather than the decision itself, and check anything that affects tax, compliance or a significant financial commitment with a qualified professional. The disclaimer sets this out in full.
Get in touch
If a calculator gives a result that looks wrong, if a formula needs a caveat, or if there is a calculator you would like added, the contact page goes straight to a real inbox. Corrections are genuinely welcome — the site is more useful when the numbers are right.