Concrete Volume Calculator – Online Slab, Footing, Column
Calculate cubic yards or meters for various shapes (rectangular slab, circular column, trapezoidal footing). Local math tool.
UD5 Toolkit
Master Chinese vocabulary across all HSK levels with interactive flashcards and quizzes
Calculate cubic yards or meters for various shapes (rectangular slab, circular column, trapezoidal footing). Local math tool.
Set up high-intensity interval training rounds with work and rest periods. Audio alerts and customizable sets. Runs in background, no download.
Enter a Sudoku puzzle and watch it solved step-by-step with techniques explained. Learn solving strategies. Local only.
Visual chart showing the typical colors a bruise goes through from red to yellow. Educational only.
Create a simple agenda with timeboxes for each topic. Visual countdown and alerts for each.
Calculate water and soda ash needed to pre‑soak fabric for tie‑dye. Achieve vibrant, long‑lasting colors.
Calculate required bags of cement, sand, and gravel for a given concrete volume using standard mix ratios (1:2:4, etc.). Supports metric and imperial.
Mix your own feed by entering grain percentages and see the resulting crude protein. Formulate a balanced diet for your flock.
Learn to tie essential knots with step-by-step animated diagrams. Includes bowline, square knot, clove hitch, and more. Pure CSS/JS animation.
Enter number of eyelet pairs and lacing style to find the correct shoelace length in inches/cm. Never buy too short.
Enter a hook size in any system and instantly see the equivalent in all other standards.
Paste a mixed text and get a list of only the emojis found within. Counts each unique emoji. Data cleanliness tool.
Select a tool (VS Code, Figma, etc.) and get random shortcut prompts. Press the keys to practice.
Compare common knots by their efficiency percentage and residual strength. Interactive chart with animated diagrams.
Select herb and method to see estimated drying time. Set a reminder to check. Preserve flavor.
Reference diagrams for USB‑A, USB‑C, micro‑USB pinouts. See wire colors and signal descriptions. Hardware hacking helper.
Compute simple interest and final amount given principal, annual rate, and duration. Also reverse-calculates rate or time. Local only.
Project how your savings and investments grow over time with compound interest. Interactive chart and detailed table. Free and anonymous.
Pull out all URLs and links from text. Extract domains, paths, and protocols. Perfect for SEO scraping or analyzing text documents. Client-side execution.
Choose your tea type and start a precise steeping timer with color‑changing background. Never over‑steep again.
Calculate dehydrating time based on meat slice thickness and desired texture. Countdown timer with reminders.
Enter a URL and trace the full redirect chain, seeing each hop's status code and location. Identify unnecessary redirects. Client-side fetch.
Displays the national poison control number and basic first steps for common household ingestions. Seek medical help immediately.
Check HTTP status codes for multiple URLs at once. Identify broken links and redirects. All requests made via browser fetch.
Choose your cup size and sweetness level, and get exact proportions for tea, milk, syrup, and tapioca pearls. Perfect homemade boba every time.
Perform common percentage calculations: find percent of a number, percentage increase/decrease, and more. Simple, fast, and always available for free.
Select tea type and get recommended steeping time & temperature. Start a visual countdown with an alert. Make every cup perfect. No ads, local.
Find essential Visual Studio Code shortcuts for Windows, Mac, and Linux. Filter by category. Boost your coding speed with this reference.
Calculate airflow in cubic feet per minute given velocity and duct diameter. Simple HVAC reference. Local only.
Enter a URL and see the full HTTP response headers returned by the server. Detect redirects and server type. Useful for SEO and web debugging.