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Free calculators & tools

AI cost and ROI calculators, SEO and content tools, an llms.txt generator, marketing metrics, EMI, GST and more. Everything runs on your device — nothing is uploaded.

AI API Cost & Token Calculator Estimate what an AI model API call or monthly workload will cost from tokens and per-million… AI AI Time-Saved ROI Calculator See how much time and money an AI tool saves your team each month compared with… AI AI Prompt Generator Build a clear, structured prompt (role, task, context, format, constraints) and open it in your favourite… AI Word Counter & Reading Time Count words, characters, sentences and paragraphs, with reading time, speaking time and a Flesch readability score. Content & SEO Keyword Density Checker Find your most used words and phrases and check a focus keyword’s density. Content & SEO Google SERP Snippet Preview Preview how your title and meta description look in Google on desktop and mobile, with pixel-width… Content & SEO Meta Tag & Open Graph Generator Generate title, description, canonical, Open Graph and Twitter Card tags ready to paste. Content & SEO URL Slug Generator Turn any title into a clean, SEO-friendly URL slug. Content & SEO llms.txt Generator Create an llms.txt file that helps AI assistants understand your site, with sections and links. Content & SEO Text Case Converter Convert text to UPPER CASE, lower case, Title Case, Sentence case, camelCase, snake_case and kebab-case. Content & SEO UTM Campaign URL Builder Add UTM parameters to any URL so you can track campaigns in Google Analytics. Marketing Guest Post ROI Calculator Work out the cost per visit, cost per lead and return on a guest post or… Guest posting Marketing ROI Calculator Calculate return on investment and net profit for any marketing campaign. Marketing CTR, CPC, CPM & ROAS Calculator Calculate click-through rate, cost per click, cost per thousand impressions, cost per acquisition and ROAS from… Marketing Profit Margin & Markup Calculator Find profit, margin and markup from cost and price, or work out the price you need… Money & Business Loan EMI Calculator Calculate your monthly EMI, total interest and a yearly repayment schedule for any loan. Money & Business GST Calculator (India) Add or remove GST from an amount, with the CGST/SGST or IGST split. Money & Business Percentage Calculator Quickly work out X% of Y, what percent one number is of another, and percentage change. Money & Business Strong Password Generator Generate strong random passwords in your browser — nothing is sent or stored. Developer JSON Formatter & Validator Format, minify and validate JSON with clear error messages. Developer