Free online tools for everything.
Instantly calculate finance, health, maths, conversions, dates, tax and engineering — plus full PDF, subtitle and social toolkits. Accurate, fast and free.
Popular calculators
The tools people reach for most.
PDF tools
Merge, split, convert, compress & edit PDFs — 100% in your browser.
Media & content tools
Subtitles, fonts, hashtags and generators — free and private.
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Built to be trusted, not to trap you.
Four steps, no friction.
Frequently asked questions
Are the DigiToolkit calculators free?
Yes. Every calculator on DigiToolkit is 100% free, with no sign-up, no app download and no usage limits.
Do I need to create an account?
No account is needed. Open any calculator and start using it instantly.
Do the calculators work on mobile?
Yes. All calculators are mobile-first and fully responsive, so they work on phones, tablets and desktops.
How accurate are the results?
Each calculator uses the standard, generally accepted formula for its purpose and shows the formula, a worked example and a step-by-step breakdown so you can verify the result.
Is my data stored or shared?
No. Calculations run entirely in your browser. The values you enter are never sent to a server or to analytics platforms.
How do I find the right calculator?
Use the search bar at the top, browse by category, or open the full calculator directory to filter by name, category and letter.
Why do I have to press Calculate?
Calculators only compute when you press the Calculate button, so you can finish entering all your values first. Press Reset to clear the form.
Can I use the calculators offline?
Most calculators work offline once the page has loaded. A few advanced maths tools need an internet connection to load a maths library.
Are the finance and health results advice?
No. Finance tools give estimates, not financial advice, and health tools give general estimates, not medical advice. Always consult a qualified professional.
Can I request a new calculator?
Yes! Use the “Suggest a Calculator” link in the footer to tell us what you need — popular requests get built first.