A/B Test Significance Calculator - Online Simple Stats Tool
Check if your A/B test results are statistically significant using chi-squared test. Enter visitors & conversions for control/variant. Results in plain English.
UD5 Toolkit
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Our Love Calculator uses a playful algorithm that blends letter values, name length, and a touch of romantic magic to generate your unique love percentage. Simply enter two names and instantly discover your compatibility score – a fun way to spark conversation or add excitement to your day!
Check if your A/B test results are statistically significant using chi-squared test. Enter visitors & conversions for control/variant. Results in plain English.
Enter an emoji or browse to see which Unicode version introduced it and whether older OS versions might fail.
Enter number of eyelet pairs and lacing style to find the correct shoelace length in inches/cm. Never buy too short.
Enter two city names or coordinates and get the straight‑line distance in miles/km. Local calculation.
Estimate the sinker weight needed to hold bottom in current based on line diameter, depth, and current speed.
Enter piece count and piece size to estimate finished dimensions. Check if it fits your table.
Enter rolls remaining and household size to estimate weeks of supply. A humorous yet practical aid.
Enter amount of kernels and see estimated popped volume. Plan movie night snacks perfectly.
Calculate ideal stereo speaker placement (toe-in, distance from wall) for best soundstage. Visual diagram. For audiophiles. Local tool.
Find the optimal TV size for your room or the best viewing distance based on screen size and resolution (1080p, 4K, 8K). Simple THX/SMPTE reference.
Estimate BAC based on gender, weight, drinks consumed, and time. Uses Widmark formula. Educational tool, never encourage drunk driving. Local only.
Compute simple interest and final amount given principal, annual rate, and duration. Also reverse-calculates rate or time. Local only.
Enter any date and get its ISO week number, plus the start and end dates of that week. Quick reference.
Paste your CSS and see warnings for properties that have limited browser support. Links to CanIUse. Modernize safely.
Enter a hex color and get its relative luminance per WCAG definition. Understand why this matters for contrast.
Add N business days to a date, skipping weekends and optionally entering custom holidays. Regional presets.
Calculate the exact number of days, weeks, months, and workdays between two dates. Visual calendar highlights. Perfect for projects.
Choose your cup size and sweetness level, and get exact proportions for tea, milk, syrup, and tapioca pearls. Perfect homemade boba every time.
Combine multiple identical batteries in series and parallel and see the resulting voltage and total capacity. Electronics helper.
Track your subscriptions, calculate monthly and yearly totals, and find savings by pausing unused services. Local data.
Determine the minimum sample size needed for a survey or A/B test with a given confidence level and margin of error.
Easily compute posterior probabilities given prior, likelihood, and marginal likelihood. Visual diagram. All local.
Find out how large you can print based on image resolution in pixels. Understand DPI and megapixels.
Learn about f‑stops and their effect on light and depth. Calculate equivalent exposure adjustments. Educational.
Measure your waist‑to‑hip ratio and learn about associated health risks. WHR interpretation. Educational only.
Find what day of the week any past or future date falls on. Uses Zeller’s congruence. Fun historical reference tool.
Find the centroid (center of mass) of any convex polygon by entering vertex coordinates. Useful for physics and design.
Fairly distribute pooled tips among staff based on hours worked or points. Customizable percentages. All calculations local and private.
Estimate the total price after adding US state sales tax. Select state, enter amount, and see breakdown. Simple and quick, perfect for shoppers.
Project how your savings and investments grow over time with compound interest. Interactive chart and detailed table. Free and anonymous.