Everyday answers, in 150+ free calculators
Money, salary, units, dates, AI costs — every tool runs instantly in your browser. No sign-up, and your numbers never leave your device.
AI Cost Intelligence
SpecializedOur deep-dive suite — live pricing, real budgets, real decisions.
AI Model Cheat Sheet
Every model's price, context window & best use — one page, updated monthly.
Compare🤖AI API Cost Calculator
Estimate and compare your monthly bill across 14 GPT, Claude & Gemini models.
Estimate🔢Token Calculator
Paste any text — see its token count and what it costs on every model.
Simulate💬Chatbot Cost Simulator
Users × messages × tokens: budget your AI product before you build it.
Decide⚖️Subscription vs API
Is ChatGPT Plus worth $20/month for you? Find your break-even point.
Track📉AI Price Tracker
Every model's current price + a monthly changelog of cuts and releases.
Reference💠Model Pricing Directory
Dedicated pricing breakdowns for every major AI model.
Money & Loans4 calculators
Salary & Work70+ pages
Unit Conversion55+ pages
AI & Dev Tools21 pages · PRO suite
Everyday Math3 calculators
Dates & Time3 calculators
Health1 calculator
Images9 tools
PDF & Documents3 tools
Text & Security6 tools
Money & Loans
🏠Mortgage Calculator
Full PITI payment, amortization schedule, and extra-payment savings.
💳Loan Calculator
Monthly payment and total interest for any personal or auto loan.
📈Compound Interest
How savings grow with monthly contributions and compounding.
🏷️Discount Calculator
Sale price and savings — including stacked "extra % off" deals.
Salary & Work
💼Salary to Hourly
Your true hourly rate — with real hours and vacation weeks.
🧾Take-Home Pay (2026)
Salary after federal tax, FICA, 401(k), and state tax.
📋Salary Breakdowns
Every salary from $25k to $300k, per hour, week, and month.
Unit Conversion
🔁Unit Converter
Length, weight, temperature, volume, area & speed in one tool.
📐Conversion Tables
55+ pages: cm to inches, kg to lbs, °C to °F, and more.
AI & Developer Tools
🤖AI API Cost Calculator
Compare GPT, Claude & Gemini pricing and estimate your bill.
💠AI Pricing Directory
Per-model pricing pages for every major AI model.
Everyday Math
％Percentage Calculator
X% of a number, percent of Y, and increase/decrease.
🍽️Tip Calculator
Tip, total, and per-person share when splitting the bill.
🛒Discount Calculator
What you actually pay after the sale sticker.
Dates & Time
📅Date Calculator
Days between dates (with business days), add/subtract days.
🎂Age Calculator
Exact age in years, months, days — plus next-birthday countdown.
Health
Images
✂️Background Remover
AI cutout to a transparent PNG — your photo never leaves your browser.
🖼️Image Compressor
Shrink JPG/PNG/WebP file size in your browser — nothing is uploaded.
🔄Image Converter
HEIC to JPG, WebP to PNG — convert between formats locally.
🕵️EXIF Viewer & Remover
See hidden GPS and camera metadata in photos — and strip it out.
✂Crop for Social Media
YouTube thumbnail, Instagram, and profile-circle presets with drag & zoom.
⭐Favicon Generator
One image to every favicon size plus a real .ico — zipped.
💧Watermark Tool
Add a text or logo watermark to photos — corners or tiled.
📄Image to Base64
Data URI generator with ready-made HTML and CSS snippets.
⚪Round Corners & Circle
Rounded corners or circle crop to a transparent PNG.
PDF & Documents
📎Merge PDF
Combine several PDFs into one, in the order you choose — no upload.
🖼️JPG to PDF
Turn photos and images into a single PDF document.
✂️Split PDF
Extract a page range, or save every page as its own PDF.
Text & Security
✍️Word Counter
Live word, character, sentence counts and reading time.
🔐Password Generator
Strong random passwords, generated locally in your browser.
▦QR Code Generator
Any link or text to a downloadable QR code — all in your browser.
🔗URL Shortener
Turn a long link into a short, shareable one — free, no sign-up.
🔠Case Converter
UPPERCASE, lowercase, Title Case, camelCase, snake_case in one click.
⏱️Timestamp Converter
Unix epoch time to readable date and back — live current timestamp.
🆚Diff Checker
Compare two texts line by line and see exactly what changed.
Guides
🗜️Reduce Photo File Size
Email limits, uploads, and web images — realistic targets and how to hit them.
🕵️What Your Photos Reveal
EXIF, GPS, and which platforms strip metadata — and which don't.
▶️YouTube Thumbnail Guide
The 2026 spec, safe zones, and design habits that raise clicks.
🧾Understanding Take-Home Pay
Marginal brackets, FICA, and why identical salaries pay differently.
📈Compound Interest, Explained
Real 10-year numbers, the rule of 72, and starting early vs contributing more.
🤖Choosing an AI Model by Cost
Price tiers, 80/20 routing, and a worked chatbot bill on three models.