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
Fill the Times Table – sharpen your mental math skills
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
Generate printable math worksheets for addition, subtraction, multiplication, and division. Choose difficulty and number of problems. Answer key included.
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Estimate make probability of a putt based on distance and skill rating. For disc golf enthusiasts. Fun statistical tool, no data upload.
Answer a series of deliberately confusing and trick questions. Lives system and funny wrong answers. Playful, no data stored.
Random shapes appear; compute the area mentally. Multiple choice. For middle schoolers.
Convert between scientific notation (a Ă— 10^n) and decimal form. Also supports engineering notation. Instant, local.
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.
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Type a word and see if it can be spelled using chemical element symbols. Geeky custom message creator. Copy or share.
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.
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.
Try to draw a perfect circle freehand. Score based on roundness. Fun and addictive. No data sent.
Calculate odds of drawing specific cards or poker hands from a standard deck. Learn combinations. Local math.
Divide a total bill among multiple people considering tax and service fees. See exactly who pays what.
Draw perfect ellipses by dragging focal points and a point on the curve. See the equation update dynamically. Educational.
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
A collection of clean, family‑friendly riddles with a reveal‑on‑click answer. Random riddle each time. Perfect for break time.
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Convert guinea pig age to approximate human years. Cute facts included. For guinea pig lovers. 100% local.
Cute vegetable-themed memory matching game for preschoolers. No ads, simple interface.
Convert across length, mass, speed, temperature, data, and more. Search any unit and type. Compact and fast.
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.
Classic memory card game with emoji or color themes. Select grid size and try to find all pairs in minimum moves. Brain training fun.
Convert a numeric amount into English words, perfect for writing checks or legal documents. Supports USD/GBP styles.
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.
Select a destination language and generate a printable mini phrasebook with essential greetings, directions, food, and emergency phrases. Local only.