Mental Math Trainer - Online Timed Arithmetic
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
UD5 Toolkit
Sharpen your arithmetic skills with timed drills
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Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Generate printable math worksheets for addition, subtraction, multiplication, and division. Choose difficulty and number of problems. Answer key included.
Complete a 10x10 multiplication grid against the clock. A fun way to master times tables.
Random shapes appear; compute the area mentally. Multiple choice. For middle schoolers.
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
Evaluate the Gamma function for real and complex inputs (real part). Extension of factorial. Academic mathematics tool.
Estimate make probability of a putt based on distance and skill rating. For disc golf enthusiasts. Fun statistical tool, no data upload.
Scroll through thousands of pre‑computed digits of π. Search for a specific string of digits. For math lovers.
Convert between scientific notation (a × 10^n) and decimal form. Also supports engineering notation. Instant, local.
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Enter two names and get a playful love compatibility percentage. Purely for entertainment! All calculation happens instantly in your browser.
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Determine what score you need on your final exam to achieve your target overall grade. Enter current grade, weight, desired grade. Local only.
Translate hexadecimal numbers to decimal integers. Instantly see the magnitude. A simple, private utility for developers and mathematicians.
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
Draw perfect ellipses by dragging focal points and a point on the curve. See the equation update dynamically. Educational.
Answer a series of deliberately confusing and trick questions. Lives system and funny wrong answers. Playful, no data stored.
A kanji appears; you guess how many strokes it has. Learn stroke order awareness.
Calculate odds of drawing specific cards or poker hands from a standard deck. Learn combinations. Local math.
A collection of clean, family‑friendly riddles with a reveal‑on‑click answer. Random riddle each time. Perfect for break time.
Convert guinea pig age to approximate human years. Cute facts included. For guinea pig lovers. 100% local.
Select a destination language and generate a printable mini phrasebook with essential greetings, directions, food, and emergency phrases. Local only.
Type a number and see its full English word representation (e.g., 123 → one hundred twenty‑three). Supports large numbers.
Convert a numeric amount into English words, perfect for writing checks or legal documents. Supports USD/GBP styles.
Combine two random elements and get a surprising result. Inspired by Little Alchemy. Infinite ideas. All local.
Try to draw a perfect circle freehand. Score based on roundness. Fun and addictive. No data sent.
Type a word and see if it can be spelled using chemical element symbols. Geeky custom message creator. Copy or share.
Peer into the virtual crystal ball to get a randomly generated, absurdly specific fortune. A fun start to your day.
Calculate how much resin part A and part B to measure for a given total volume. Common ratios (2:1, 1:1). Avoid sticky failures. Local.
Roll virtual dice with animated 3D spins. Choose any number and type. See total and individual results. Fun for games.