Insulation R-Value Calculator - Online Building Thermal Envelope Tool
Compare insulation materials and thicknesses to achieve a target R-value. Understand U-factor. Educational home improvement tool. Local.
UD5 Toolkit
Quickly calculate sale price, savings, and discount percentage.
Compare insulation materials and thicknesses to achieve a target R-value. Understand U-factor. Educational home improvement tool. Local.
Enter bolt diameter and applied torque to estimate clamping force. Use standard friction factors.
Calculate probability of getting a specific sum when rolling multiple dice. Visual bar chart. Useful for tabletop RPG players. Instant local computation.
Enter two date‑time values and get the exact years, months, days, hours, minutes difference. Word output also.
Display used/total/limit JS heap size using performance.memory. Take snapshots and see growth. Simple memory leak detection.
Visualize the probability distribution of dice rolls as a color‑coded heatmap. For any NdM combination. RPG strategist's dream.
Press any key combination and record the sequence. Export as JSON or human‑readable text. Perfect for documenting shortcuts.
Roll any number of dice thousands of times and see a live bar chart of the sum distribution. Great for game designers.
Type sender and recipient addresses and format them for printing on a standard envelope. No special software.
Drag a positioned box and see the top/right/bottom/left values change. Understand containing blocks. Visual.
Generate a sample sleep schedule for babies 0-24 months based on age-appropriate wake windows. Nap count and bedtime suggestions. Educational reference.
Rate symptoms severity daily and add notes. Visual pain map. Export for doctor visit. Private local storage.
Enter HSL values and get the exact RGB representation. Also shows hex. For fine‑tuning design tokens. Client‑side.
Play the Pig dice game: roll to accumulate points, but a 1 ends your turn. First to 100 wins. Simple hot‑seat local game.
Type JavaScript expressions and see output like a real browser console. Supports console.log, error, warn. Use for quick testing without DevTools.
Flip a coin and track your full history. See percentage of heads/tails and longest streak. Pure RNG, no bias.
Enter your elevation and find the exact boiling point of water. Useful for high‑altitude cooking and tea brewing. Local math.
Randomly given base form, type past simple and past participle. Score tracking.
Connect to a WebSocket endpoint, send messages, and view the stream of received data. Perfect for debugging real‑time apps.
Test the powerful :has() pseudo‑class. Write selectors like .card:has(img) and see the live result. Revolutionary for CSS architecture.
Get a piece of either wise or hilariously useless advice. Instant life tips. Pure fun.
Calculate the exact number of days, weeks, months, and workdays between two dates. Visual calendar highlights. Perfect for projects.
Choose your cup size and sweetness level, and get exact proportions for tea, milk, syrup, and tapioca pearls. Perfect homemade boba every time.
Enter temperature and wind speed (or humidity) to get the 'feels like' temperature. Safety guidelines included.
Calculate resistor values for transistor fixed bias or voltage divider configuration. Quick quiescent point analysis.
Combine multiple identical batteries in series and parallel and see the resulting voltage and total capacity. Electronics helper.
Track your subscriptions, calculate monthly and yearly totals, and find savings by pausing unused services. Local data.
Determine the minimum sample size needed for a survey or A/B test with a given confidence level and margin of error.
Compute confidence intervals for a population mean (known/unknown sigma) and proportion. All popular Z/T values. Local.
Evaluate the Gamma function for real and complex inputs (real part). Extension of factorial. Academic mathematics tool.