Polygon Area Calculator - Online Irregular Shape Tool
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
UD5 Toolkit
Test your knowledge of area formulas for triangles, circles, rectangles, and trapezoids!
Enter the area in square units.
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.
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
Determine what score you need on your final exam to achieve your target overall grade. Enter current grade, weight, desired grade. Local only.
Generate printable math worksheets for addition, subtraction, multiplication, and division. Choose difficulty and number of problems. Answer key included.
Try to draw a perfect circle freehand. Score based on roundness. Fun and addictive. No data sent.
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 ideal stereo speaker placement (toe-in, distance from wall) for best soundstage. Visual diagram. For audiophiles. Local tool.
Drag the seven tangram pieces to form a target silhouette. Multiple puzzles. Develop spatial thinking. All canvas interactions.
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Calculate odds of drawing specific cards or poker hands from a standard deck. Learn combinations. Local math.
Enter two names and get a playful love compatibility percentage. Purely for entertainment! All calculation happens instantly in your browser.
A kanji appears; you guess how many strokes it has. Learn stroke order awareness.
Design circular string art by ticking nails and seeing simulated thread lines. Adjust number of nails and steps. Export pattern. Local only.
Evaluate the Gamma function for real and complex inputs (real part). Extension of factorial. Academic mathematics tool.
Answer a series of deliberately confusing and trick questions. Lives system and funny wrong answers. Playful, no data stored.
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.
Draw a 3D box or room interior by dragging vanishing points. Great for learning perspective drawing. Export as image.
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
Scroll through thousands of pre‑computed digits of π. Search for a specific string of digits. For math lovers.
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Divide a total bill among multiple people considering tax and service fees. See exactly who pays what.
Enter a location and date to find the exact time of solar noon, sunrise, and sunset. Astronomy tool.
A collection of clean, family‑friendly riddles with a reveal‑on‑click answer. Random riddle each time. Perfect for break time.
Select a destination language and generate a printable mini phrasebook with essential greetings, directions, food, and emergency phrases. Local only.
Convert between scientific notation (a × 10^n) and decimal form. Also supports engineering notation. Instant, local.
Type a word and see if it can be spelled using chemical element symbols. Geeky custom message creator. Copy or share.
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.