Seller Profit Calculator
Calculate profit after fees and costs, or find the selling price needed to reach your target profit.
Calculate profit →Free browser tools for everyday work
Calculate profit, estimate materials, combine keywords and prepare website settings. No sign-up required.
Paint, Flooring & Wallpaper Calculator
Estimate purchase quantities with metric or US customary units and a waste allowance.
Estimate materials →Keyword Combiner
Combine prefixes, core terms and suffixes. Remove duplicates and export keyword candidates.
Combine keywords →JSON-LD Generator
Create Organization or LocalBusiness structured data using your actual business information.
Generate JSON-LD →AI Robots.txt Generator
Build AI crawler rules and check the rule matching a bot and URL path.
Build crawler rules →No matching tools. Try another word or select All.
Check the result before using it
- Use the correct units and actual input conditions.
- Read the tool’s method, examples and limitations.
- Compare important results with product labels, settlement records or current official documentation.
Tools are free and require no sign-up. Inputs are processed in your browser and are excluded from analytics events.
About UsefulSet
We build small, practical browser tools. AI assists development and explanations; automated tests and browser checks help verify behavior. These tools do not replace professional advice or external platform approval.
Additional tools are available in the Korean collection.
Contact and corrections
Send the page URL, device/browser, reproduction steps and expected result. Remove passwords, customer information and confidential data. Inquiry information is used to answer and investigate issues; unnecessary information is deleted when no longer needed, subject to legal retention duties. Contact us for access, correction or deletion requests.
Privacy
Updated October 3, 2026. Tool inputs and generated results stay in your browser. Cloudflare hosting may process IP addresses, requested URLs and browser information for service delivery and security.
Google Analytics loads only after consent and may collect page visits, device information and general usage events with cookies and identifiers. Search queries and tool inputs are not included. You can allow or decline analytics in Analytics preferences. Withdrawal stops future collection and does not automatically delete earlier records. Consent choices and theme preferences are stored in this site’s browser storage.
Ads are currently disabled. Before enabling advertising, applicable consent requirements and Google-certified CMP settings must be reviewed. The analytics preference control is not an advertising CMP.
Google privacy policy · Cloudflare privacy policy · Google partner-site data use · Google ad settings
Terms of use
These free tools produce estimates and drafts based on your inputs. You are responsible for checking accuracy, applicable requirements and the effects on your project or website. Availability, search visibility, external platform compliance and revenue are not guaranteed. External services have their own terms. Do not enter or publish confidential information. These terms do not limit rights provided by applicable law.