Currency Converter - Online Exchange Rate (Manual Update)
Convert between currencies using manually updated or default rates. Great for estimation when offline. Local settings.
UD5 Toolkit
Your paid time off boosts your effective hourly rate by 10.6%
Convert between currencies using manually updated or default rates. Great for estimation when offline. Local settings.
Convert currencies using a built‑in table of approximate fixed rates. Useful for quick estimates without live data. Local.
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
Convert a numeric amount into English words, perfect for writing checks or legal documents. Supports USD/GBP styles.
Estimate solar heat gain through windows given SHGC and orientation. Understand cooling loads. Simple educational physics tool. Local.
Check if your A/B test results are statistically significant using chi-squared test. Enter visitors & conversions for control/variant. Results in plain English.
Find the currency code (USD, EUR, JPY) for any country or reverse‑lookup the country from a code. Static reference.
Type a number and see its full English word representation (e.g., 123 → one hundred twenty‑three). Supports large numbers.
Divide a total bill among multiple people considering tax and service fees. See exactly who pays what.
Type a mathematical expression like 'sqrt(16)+sin(pi/2)' and get the result instantly. Supports popular functions. Local.
Convert across length, mass, speed, temperature, data, and more. Search any unit and type. Compact and fast.
Calculate gear inches, meters of development, and speed ratio for any chainring/cog combination. For cyclists.
See exact mm and inch dimensions of ISO A-series and US paper sizes. Visual comparison tool. Also calculates weight based on GSM and dimensions.
Convert a number like 1234.56 to English words 'one thousand two hundred thirty-four and 56/100'. For checks.
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
Measure a ring's inside diameter or circumference and convert to US, UK, European, and Japanese sizes.
Convert text between various programming case styles. Includes SCREAMING_SNAKE, PascalCase, etc.
Translate hexadecimal numbers to decimal integers. Instantly see the magnitude. A simple, private utility for developers and mathematicians.
Enter pins per roll and calculate total bowling score including strikes and spares. Supports 10 frames. Learn scoring rules visually.
Enter an original pan size and find an alternative pan with the same batter volume. Never overflow or underfill.
Change the sample rate of an audio file (e.g., 48kHz to 44.1kHz) without leaving the browser. Ideal for podcast prep.
Calculate salt and water for a safe vegetable fermentation. Adjust for pepper weight. Visual brine guide.
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Type notes and convert them into a realistic handwriting image with varied pen styles, ink colors, and paper backgrounds. Perfect for study notes.
Convert band and cup sizes between US, UK, European, French, and Australian systems. Accurate shopping abroad.
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Drag pie slices to represent fractions and see them added together. Great for visual learners.
Enter mold dimensions or water weight to get total resin needed, including Part A and B.
Convert between nautical miles, statute miles, kilometers, and knots to mph/kmh. Essential for navigation.
Calculate the amount of wax, fragrance oil, and dye for silicone mold cavities. Perfect scent throw.