Disclaimer

Sumwise's calculators are for planning and estimating. We work hard to make them accurate and show every formula and source so you can check them, but results can be wrong — inputs can be mis-entered, rates change and your situation may differ from the assumptions stated on a page.

Building and trade calculators

Material quantities include the waste allowance stated on each page; real waste depends on layout and cuts. Calculators do not size structural members. Spans, fixings, roof pitch minimums and other structural or safety requirements are set by your local building code and the manufacturer's instructions. Check them with your building department or a qualified professional before you build.

Seller fee calculators

Marketplace fees change and can vary by country, category, currency and account. Each rate shows the date we last checked it against the platform's own page. Always confirm on the platform before setting prices. Results are not tax or accounting advice.

Creator payout calculators

Payouts depend on your agreement with the platform, your country, taxes and payment fees. Our figures use the platform's published rates on the date shown and are not a statement of what you will be paid.

No liability

The site is provided as is, without warranty. To the extent the law allows, Poorna Jayasinghe is not liable for losses arising from use of the calculators or reliance on their results.

External links and ads

Links to platforms and sources are for reference; we don't control those sites. Ads are served by third parties and are not endorsements.