Hobby

Enter hits and at-bats to get a baseball batting average in the standard .000 (three-decimal) format, plus the hits needed to reach marks like .300.

Calculate a baseball winning percentage to three decimals from wins and losses. Ties are excluded, with games, wins, and losses also listed.

Just enter your dog's or cat's age to instantly see how old they are in human years. It accounts for how small, medium, and large dogs age differently, and shows the life stage plus a handy age-conversion chart.

Convert between binary, octal, decimal and hexadecimal, plus any base from 2 to 36. See your value listed in every common base at once.

Enter an IPv4 address and a prefix length (CIDR) to instantly get the network and broadcast addresses, usable host range and host count, subnet mask, and wildcard mask. The binary representation of each value is listed too.

Convert any date, time, and time zone (JST/UTC) into a Unix timestamp (epoch seconds) starting from January 1, 1970. Milliseconds, ISO 8601, and the UTC equivalent are shown at the same time.

Convert a UNIX timestamp (seconds or milliseconds) into a readable date and time in JST or UTC, with the weekday and ISO 8601 string included.

Instantly work out your CVR from conversions and sessions. Includes a table that back-calculates the conversions needed to reach a target CVR.

Instantly calculate click-through rate (CTR) from your clicks and impressions. Perfect for checking the response rate of ads, emails, and search results.

Calculate cost per click (CPC) from your ad spend and clicks, and estimate how many clicks a given budget can buy.

Just enter your investment and profit (or revenue and cost) to instantly get ROI and the return multiple. See the payback of ad spend or inventory at a glance.

Enter the site area and total floor area to instantly get the floor area ratio (%). You can also work backward from a permitted ratio to find how much floor area you can build, plus an explanation of road-width limits.

Calculate the building coverage ratio (%) from site area and building footprint. Reverse-calculate the maximum buildable area from a zoning limit, with corner-lot relaxation explained.

Just paste your numbers to instantly compute summary statistics including the mean, variance, standard deviation, and median.

Paste a set of test or class scores and instantly get each entry's T-score, the mean, standard deviation, and rank. Enter any score to see exactly what T-score and rank it corresponds to.

Just enter your numbers and instantly get all three means at once: arithmetic, geometric, and harmonic.

A free tool that calculates the composition ratio just from item names and values, instantly drawing a color-coded pie chart and a table of shares.

Just paste your numbers and a line chart is drawn automatically. Compare multiple series and see the min, max, and average summarized at the same time. Great for visualizing trends in sales, traffic, temperatures, and more.

Just enter labels and values to instantly draw a vertical bar chart. Get a clean chart with axes, gridlines, and value labels, plus the total, average, maximum, and each item's percentage share. Great for quickly visualizing survey results, test scores, or sales comparisons.