Age Calculator
Find your exact age in years, months, days, hours, and minutes. Plus your zodiac sign, generation, days to your next birthday, and more.
Defaults to today. Change to calculate age on any date.
Enter your date of birth to get started
Your results appear instantly as you type
What You Get
Exact age breakdown
Years, months, and days calculated precisely — accounts for leap years and varying month lengths.
Total time lived
Your age expressed as total days, weeks, hours, and minutes. More than you might expect.
Birthday countdown
Exact days until your next birthday, with the date and day of the week it falls on.
Zodiac & generation
Your Western zodiac sign and which named generation you belong to, with year ranges.
How Age is Calculated
Calculating an exact age sounds simple, but most tools get it slightly wrong. The correct method counts complete calendar years, then the remaining complete months, then the remaining days — accounting for the fact that months have different lengths (28–31 days) and that leap years add an extra day in February.
The "Calculate As Of" field lets you calculate your age on any date — not just today. This is useful for legal purposes (how old were you on a specific date?), historical curiosity, or planning ahead (how old will I be when I retire?). Simply change the date and the calculation updates instantly.
All calculations run entirely in your browser. Your date of birth is never sent to a server, stored, or shared. The tool works offline once the page is loaded.
Frequently Asked Questions
How do I calculate my exact age?
Enter your date of birth in the Date of Birth field. The calculator instantly shows your exact age in years, months, and days, accounting for leap years and varying month lengths automatically.
What is the best free age calculator?
ToolStack's Age Calculator is one of the most feature-rich free options. It shows exact age breakdown, total days and hours lived, days until your next birthday, zodiac sign, generation label, and a life percentage — all in a clean, ad-free interface with no signup required.
How many days until my next birthday?
Enter your date of birth and the calculator automatically shows how many days remain until your next birthday, including the exact date and day of the week.
Can I calculate my age on a past or future date?
Yes. The 'Calculate As Of' field defaults to today but can be changed to any date. This lets you find how old you were on a specific historical date, or how old you will be on a future date.
What generation am I?
Generations: Greatest Generation (before 1928), Silent Generation (1928–1945), Baby Boomer (1946–1964), Generation X (1965–1980), Millennial (1981–1996), Generation Z (1997–2012), Generation Alpha (2013–present).
How is my zodiac sign determined?
Your zodiac sign is based on your birth month and day using the Western tropical zodiac system. For example, March 21–April 19 is Aries, April 20–May 20 is Taurus, and so on.
Is my date of birth stored or sent anywhere?
No. This calculator runs entirely in your browser. Your date of birth is never sent to any server, stored in a database, or shared with any third party.
More Free Tools
60 tools being built — all free, no signup, instant results.
AI Prompt Generator
Generate expert prompts for ChatGPT, Claude, Gemini & more using RISEN, STAR, Chain-of-Thought and 4 other frameworks.
Word Counter & Readability
Instant word count, character count, readability score, reading time, keyword density and AI grammar fixer.
Meta Description Generator
Generate SEO-optimised meta descriptions for any page. Character counter included. GPT-4o powered.
Email Subject Line Tester
Score your email subject lines for open rate potential, spam triggers and emotional power words.
Hashtag Generator
Generate targeted hashtags for Instagram, TikTok, LinkedIn, YouTube & X. AI-powered 3-tier mix: popular, growing and niche hashtags.
Blog Title Generator
Generate 10 click-worthy blog titles from any topic. SEO, listicles, how-tos, curiosity hooks and more. GPT-4o powered.
Password Generator
Cryptographically secure random passwords. Custom length, symbols, numbers. Runs entirely in your browser.
QR Code Generator
Generate QR codes for URLs, WiFi, email, phone and text. Free PNG & SVG download. No signup, no expiry, 100% private.
VAT Calculator
Add or remove VAT instantly for 40+ countries. UK, EU, UAE, Australia and more. Standard and reduced rates. Invoice calculator included.
Invoice Generator
Create professional invoices in seconds. Add line items, VAT, discounts and download as PDF. Free, no signup, no watermark.
Code Diff Checker
Compare two JSON or code files side-by-side with an IDE-grade visual diff editor. Instantly spot additions, deletions, and modifications.
JWT Decoder
Decode any JSON Web Token instantly. View header, payload, and all claims. Check expiry, issuer, and subject. 100% client-side — token never leaves your browser.
JSON Formatter
Format, validate and beautify JSON instantly. Syntax highlighting, error detection with line numbers, minify mode. 100% private.
Paraphrasing Tool
Rewrite any text with AI. 6 modes: Standard, Fluency, Formal, Academic, Creative and Shorten. GPT-4o powered, no word limit, no signup.
Grammar Checker
Check and fix grammar, spelling and punctuation with AI. Get corrected text plus explanations for every fix. GPT-4o powered, no word limit.
Text Summarizer
Summarise any text with AI. 4 modes: paragraph, bullet points, key takeaways and executive summary. GPT-4o powered, no word limit, no signup.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, PascalCase, kebab-case and more. 10 modes, instant, free.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text instantly. Paragraphs, sentences, words or list items. HTML output included. Free, no signup, unlimited.
Cover Letter Generator
Generate a professional AI cover letter in seconds. 4 tone modes: Professional, Enthusiastic, Concise and Creative. GPT-4o powered, unlimited, no signup.
Character Counter
Count characters, words, sentences and paragraphs in real time. Live progress bars for Twitter, Instagram, LinkedIn, YouTube, TikTok and SMS limits.
Business Name Generator
AI brand architect mode — generate premium names with GoDaddy & TM checks.
YouTube SEO Elite
Generate high-ranking tags & description hooks with AI.
Email Signature Generator
Create professional HTML email signatures for Gmail, Outlook & Apple Mail. 4 templates, custom colours, social links. Free, no signup.
CSS Gradient Generator
Create beautiful CSS gradients with a visual editor. Linear, radial and conic with 12+ curated presets. Copy CSS instantly.
AI Color Palette Generator
Describe your brand in words and get a professional 5-color palette with hex codes, CSS variables and Tailwind config instantly.
Colour Contrast Checker
Check your colour combinations against WCAG guidelines for AA and AAA compliance.
Favicon Generator
Generate perfect favicons from text or emoji in all standard sizes including Apple Touch constraints.
Base64 Converter
Instantly encode text to Base64 or decode Base64 strings back to text securely in your browser.
UTM Builder
Generate tracking links for your campaigns to monitor traffic perfectly in Google Analytics.
Markdown Editor
Instantly render Markdown syntax into clean, standard HTML code with real-time visual previews.
Regex Tester
Test, build, and debug Regular Expressions with real-time semantic highlighting and exact indexing.
SQL Formatter
Beautify raw, minified database queries into perfectly indented, readable syntax.
Epoch Converter
Instantly translate Unix epoch integers into formatted dates across timezones.
Tip Calculator
Calculate tips and split bills instantly. Tipping customs for 20+ countries, service quality presets, and per-person amounts.
Mortgage Calculator
Monthly payments, total interest, and full amortisation schedule. Repayment and interest-only mortgages. 15 currencies.
Percentage Calculator
Six calculators in one: find a percentage, increase/decrease, percentage change, and percentage difference.
Salary Calculator
Calculate take-home pay after tax. Full UK PAYE 2024/25 and US Federal 2024 with complete deductions breakdown.