◆ Arb Digital · Free Tools
822 Free Online Tools,
822 Free Online Tools,
Organised Into 15 Categories
Calculators, converters and generators for finance, marketing, health, property, tax and development. Search for the one you need, or start from a category.
✅ No signup 💳 No card 🔒 Runs in your browser ♾️ Always free
Start typing to search every tool by name. Or browse the 15 categories below.
Browse by category
Every tool lives in one of these 15 categories. Each category page lists all of its tools.
- Business, Marketing & SEO120 tools Paid-media economics, SEO diagnostics, content and business maths.
- Education & Students115 tools Arithmetic, algebra, geometry, statistics and study planning.
- Finance & Money104 tools Budgeting, saving, debt payoff, compound growth and take-home pay.
- Developer & Text83 tools Formatters, encoders, generators and parsers that run in your browser.
- Converters65 tools Length, weight, volume, energy, pressure and specialist units.
- Health & Fitness58 tools Body composition, energy needs, training zones and pacing.
- Loans & Mortgage45 tools Payments, amortisation, affordability and refinance break-even.
- Everyday & Fun44 tools Dates, running costs, home projects and everyday shopping maths.
- Insurance35 tools Coverage needs, premium trade-offs and out-of-pocket exposure.
- Tax35 tools Income, payroll, self-employment, capital gains and sales tax.
- Investing & Crypto30 tools Returns, compounding, position sizing and portfolio risk.
- AI & Modern30 tools Token costs, context budgets and spend planning for LLM projects.
- Real Estate25 tools Cap rate, cash-on-cash, rental yield and deal analysis.
- Image Tools21 tools Resize, crop, compress, convert and watermark, all client-side.
- PDF Tools12 tools Merge, split, compress, rotate and convert PDFs in your browser.
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Most popular tools
The tools people arrive here looking for most often, based on our own search traffic over the last 90 days.
- Running Pace Calculator Free pace calculator — pace per km/mile and speed for any distance and time.
- Keyword Density Checker Instantly check keyword density and catch keyword stuffing before you publis...
- Domain Authority Checker Estimate your site's authority signals from links, age, spam score, and bran...
- Shoe Size Converter Convert shoe sizes across US, UK, EU, and CM for men, women, and kids.
- Meters to Feet Convert meters to feet instantly with automatic feet-and-inches breakdown, b...
- Steps to Miles Calculator Convert your step count into accurate miles and km using your real height-ba...
- Grams to Ounces Convert grams to ounces instantly with a pounds-and-ounces breakdown, both d...
- DPI/PPI Calculator Calculate true screen PPI from resolution and size, or the max print size fo...
- Extra Mortgage Payment Calculator See how much time and interest you save by paying extra toward your mortgage...
- Image Alt Text Generator Build clear, keyword-smart, accessibility-friendly alt text for any image.
- Reverse Mortgage Calculator Estimate how much cash a reverse mortgage could provide based on your age an...
- BMR Calculator Calculate your Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict,...
- Carpet Calculator Find square yards of carpet, roll length, and cost including underlay for an...
- Loan Amortization Schedule Calculator Build a full month-by-month amortization schedule for any loan, with princip...
- Credit Card Minimum Payment Calculator See how a shrinking minimum payment can stretch a balance for a decade or mo...
- Options Profit Calculator Calculate call and put option profit, loss, and break-even price at expirati...
- Personal Loan Calculator Estimate your monthly payment, total interest, and true effective APR on a p...
- RV Loan Calculator Calculate your monthly RV loan payment, total interest, and total cost in se...
- Pregnancy Due Date Calculator Estimate your due date, current week, trimester, and conception date instant...
- Life Expectancy Calculator Get an illustrative life expectancy estimate based on age, gender, and lifes...
- Withholding Tax Calculator See exactly how much federal income tax your employer withholds from each pa...
- Sales Tax Calculator Free sales tax calculator by US state or custom rate — with reverse sales ta...
- Bandwidth Converter Convert bps, Kbps, Mbps, Gbps, KB/s, and MB/s, plus calculate download time...
- Student Loan Payoff Calculator See how extra monthly payments cut years off your student loans and slash to...
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