Free online tools that just work
Calculators, checkers and generators for SEO, marketing, money, study, visas and health. No sign-up, no download, and nothing you type leaves your browser.
- Free to use
- No account needed
- Runs in your browser
- Sources shown for every rule
SEO
- FAQ Schema GeneratorGenerate valid FAQPage JSON-LD structured data from your questions and answers.
- Keyword Density CheckerFind the most used words and phrases in your text and their density.
- Meta Title & Description Length CheckerCheck title tag and meta description length in characters and pixels, with a Google result preview.
Marketing & Ads
- A/B Test Significance CalculatorCheck whether the difference between two conversion rates is statistically significant.
- Ad Budget PlannerWork out the monthly ad budget you need from your goal, conversion rate and cost per click.
- Customer Acquisition Cost CalculatorCompare customer acquisition cost by channel, with blended CAC and LTV:CAC.
- Google Ads Quality Score ExplainerSee what to fix first from your expected CTR, ad relevance and landing page ratings.
- Marketing Audit ChecklistA 24-point marketing checklist with a score and the area to fix first.
- ROAS CalculatorWork out ROAS, profit after ad spend, break-even ROAS and the ROAS you need for a profit target.
- UTM Campaign URL BuilderBuild tagged campaign URLs for Google Analytics 4 with source, medium, campaign, term and content.
Writing & Text
AI
- AI Marketing Prompt Library24 copy-ready AI prompts for ads, SEO, email, social, strategy and analytics.
- AI ROI CalculatorEstimate hours and money saved by handing repeatable work to AI, and how fast it pays back.
- AI Task AuditSee how much of your week is execution AI can take on, versus judgement and people work.
Money & Finance
- Compound Interest CalculatorSee how savings grow with monthly contributions, compounding and inflation.
- Loan / EMI CalculatorWork out your monthly loan repayment, total interest and a year-by-year repayment schedule.
- Mortgage CalculatorWork out monthly mortgage payments, total interest, loan to value and the effect of overpaying.
- UK Take-Home Pay Calculator 2026/27Work out Income Tax, National Insurance, student loan and take-home pay for 2026/27, including Scotland.
- UK VAT CalculatorAdd or remove VAT at 20%, 5% or 0%, with net, VAT and gross amounts.
Study & Visas
Health & Fitness
Everyday
- Age CalculatorWork out exact age in years, months and days, and days until the next birthday.
- Date Difference CalculatorCount the days, weeks and weekdays between two dates.
- Password GeneratorGenerate strong random passwords on your device, with a strength estimate.
- Percentage CalculatorWork out a percentage of a number, what percent one number is of another, and percentage change.
No tools match that search. Try a shorter word, such as "tax" or "visa".
How these tools are made
Each tool is built to answer one question quickly, with the formula or rule explained underneath so you can check the result yourself. Tools that depend on official rules, such as visa limits or health thresholds, link to the source and show when they were last checked. Read the editorial policy for how tools are tested and corrected.
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