Mental Math Trainer - Online Timed Arithmetic Drills
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
UD5 Toolkit
Create custom printable math drills for kids – addition, subtraction, multiplication, division & mixed operations. Perfect for teachers and parents.
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
Complete a 10x10 multiplication grid against the clock. A fun way to master times tables.
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
Estimate make probability of a putt based on distance and skill rating. For disc golf enthusiasts. Fun statistical tool, no data upload.
Draw perfect ellipses by dragging focal points and a point on the curve. See the equation update dynamically. Educational.
Random shapes appear; compute the area mentally. Multiple choice. For middle schoolers.
Evaluate the Gamma function for real and complex inputs (real part). Extension of factorial. Academic mathematics tool.
Convert between scientific notation (a Ă— 10^n) and decimal form. Also supports engineering notation. Instant, local.
Get a random tattoo concept with style and placement suggestion. For fun and inspiration only. Not real art.
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Translate hexadecimal numbers to decimal integers. Instantly see the magnitude. A simple, private utility for developers and mathematicians.
Roll virtual dice with animated 3D spins. Choose any number and type. See total and individual results. Fun for games.
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
Select a destination language and generate a printable mini phrasebook with essential greetings, directions, food, and emergency phrases. Local only.
Determine what score you need on your final exam to achieve your target overall grade. Enter current grade, weight, desired grade. Local only.
Combine two random elements and get a surprising result. Inspired by Little Alchemy. Infinite ideas. All 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.
Calculate odds of drawing specific cards or poker hands from a standard deck. Learn combinations. Local math.
Draw a 3D box or room interior by dragging vanishing points. Great for learning perspective drawing. Export as image.
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.
Scroll through thousands of pre‑computed digits of π. Search for a specific string of digits. For math lovers.
Try to draw a perfect circle freehand. Score based on roundness. Fun and addictive. No data sent.
Design circular string art by ticking nails and seeing simulated thread lines. Adjust number of nails and steps. Export pattern. Local only.
Cute vegetable-themed memory matching game for preschoolers. No ads, simple interface.
Answer a series of deliberately confusing and trick questions. Lives system and funny wrong answers. Playful, no data stored.
Convert across length, mass, speed, temperature, data, and more. Search any unit and type. Compact and fast.
Convert guinea pig age to approximate human years. Cute facts included. For guinea pig lovers. 100% local.
Type a word and see if it can be spelled using chemical element symbols. Geeky custom message creator. Copy or share.