Most Visited
Calculators
Arithmetic Mean Calculator
Calculate the arithmetic mean, median, mode, range, and both population and sample standard deviation of a dataset, with a dot plot and histogram.
FreeCalculators
Arctan2 Calculator
Calculate atan2(y, x), the angle of a point in the Cartesian plane, with quadrant detection, normalized angle, and a step-by-step breakdown.
FreeCalculators
Antilog Calculator
Calculate the antilogarithm (inverse log) of a number for base 10, e, 2, or a custom base, right in your browser.
FreeCalculators
Annuity Payout Calculator
Calculate a sustainable payout amount from a balance, or how long a fixed payment will last, right in your browser.
FreeCalculators
Amps To Watts Calculator
Convert between amps and watts for DC, AC single-phase, and AC three-phase circuits.
FreeText
Adler32 Checksum Calculator
Calculate the Adler-32 checksum of text or a file, right in your browser.
FreeText
Add Prefix And Suffix
Add the same prefix and/or suffix text to every line of a list, right in your browser.
FreeImage
Adjust Gamma Image
Brighten or darken the midtones of an image with a gamma curve, right in your browser.
FreeCalculators
A/B Test Sample Size Calculator
Find how many visitors per variant your A/B test needs, with support for multiple variants (Bonferroni-corrected) and a test duration estimate.
FreeGame
Click Speed Test (CPS Test)
The classic click test: click as fast as you can for 1 to 100 seconds with Left Click, Right Click, or Spacebar modes. Tracks your personal best for each mode and duration, your best 1-second burst, and gives you a rank title from Turtle to Godlike Clicker.
FreeMusic
Voice Recorder
Record audio from your microphone right in the browser: live level meter and waveform while recording, pause/resume, multiple takes with a visual waveform, rename, playback, and download as a standard audio file.
FreeCalculators
CIDR Calculator
Break down IPv4 or IPv6 CIDR blocks in bulk into network/broadcast address, subnet mask, and usable host range. Includes an IP-in-range checker and a subnet splitter.
FreeText
Caesar Cipher Tool
Encrypt or decrypt text with a classic Caesar cipher, with an A-Z mapping table, brute-force list, letter-frequency chart, and ROT13 shortcut.
FreeImage
Tilt Shift Effect
Turn a photo into a miniature-model tilt-shift effect with a linear or radial focus area, directly in your browser.
FreeImage
Image Crop & Resize
Crop, resize, or round the corners of an image directly in your browser.
FreeImage
Get Colors Image
Extract a dominant color palette from an image using median-cut quantization, with copy as hex or CSS variables.
FreeImage
Color Shade Generator
Generate shades, tints, tones, color schemes, and every value format (RGB, HSL, HSV, CMYK) for any color, with CSS code ready to copy.
FreeImage
Image Color Filters
Apply Grayscale, Sepia, Invert, Posterize, or Solarize filters to an image with a live preview.
FreeImage
Image Exposure Adjuster
Adjust an image's exposure in photographic stops (EV), applied in linear light for a physically accurate result.
FreeImage
Blur Image
Blur an image in your browser using Box, Gaussian, Motion, or Radial blur, then download the result.
FreeText
Blake2b Hash Generator
Compute the BLAKE2b hash of text or a file in your browser, with adjustable output length and optional keyed hashing (MAC).
FreeCalculators
Battery Life Calculator
Estimate how long a battery will last given its capacity, your device's power draw, and a real-world efficiency factor.
FreeText
Number Base Converter
Convert a number between binary, octal, decimal, hexadecimal, BCD, Gray Code, and any custom base from 2 to 36, all at once from a single input.
FreeText
Bandwidth Calculator
Convert between data units, estimate file transfer time, size website bandwidth from traffic, and convert between a monthly data allowance and a sustained connection speed.
FreeCalculators
Average Return Calculator
Calculate a true annualized investment return from irregular, dated cash flows using XIRR, or chain together multiple known returns over different holding periods into one annualized figure.
FreeCalculators
Auto Lease Calculator
Estimate a car lease's monthly payment with a full depreciation/finance/tax breakdown, solve for the max price that fits a target payment, and convert between money factor and APR.
FreeHardware
Dead Pixel Test
Cycle full-screen through 9 solid colors to spot dead, bright, or stuck pixels on any monitor, laptop, phone, or TV, with an auto-play mode for hands-free scanning.
FreeCalculators
Screen Size Calculator
See your screen's real resolution and pixel ratio live, and calculate PPI, pixel pitch, and physical size in inches or centimeters from any diagonal size and resolution.
FreeHardware
Flicker Test
A clean reference screen and step-by-step instructions for detecting PWM backlight flicker with your phone camera, plus a strobe reference.
FreeHardware
Blooming Test
Test your Mini LED or FALD display for blooming with a star field, center, corner, and edge dot patterns and adjustable dot size.
FreeHardware
Black Level Test
Test how well your screen distinguishes near-black shades with 12 labeled RGB patches and a fullscreen single-patch view.
FreeHardware
Screen Tearing Test
Test your screen for tearing with sweeping bars at an adjustable frame-locked speed, plus a VSync/FreeSync/G-Sync explainer.
FreeCalculators
Aspect Ratio Calculator
Compute missing dimensions from a ratio, simplify pixel dimensions to a ratio, or resize proportionally, with a live preview and common ratio presets.
FreeCalculators
AP Score Calculator
Estimate a rough AP exam score from your MCQ and FRQ results, clearly marked as unofficial.
FreeCalculators
APR to APY Calculator
Convert between APR and APY at any compounding frequency, with a comparison table and dollar example.
FreeCalculators
Anova Calculator
Run a one-way ANOVA test with full statistics table, effect size, and a group comparison chart, right in your browser.
FreeText
Anagram Generator
Find English anagrams and shorter words you can make from any word, right in your browser.
FreeCalculators
Amortization Calculator
Calculate a loan's monthly payment and full amortization schedule, with extra-payment savings.
FreeCalculators
BMI Category Checker
Check your BMI category from Severe Thinness to Obese Class III, with a healthy weight range for your height.
FreeCalculators
Algebraic Expression Simplifier
Simplify an algebraic expression by combining like terms, with a step-by-step breakdown.
FreeVideo
Adjust Video Speed
Speed up or slow down a video and export it, right in your browser.
FreeImage
Bulk Batch Adjust HSL Image
Apply the same hue, saturation, and lightness adjustment to many images at once, right in your browser.
FreeImage
Bulk Batch Adjust Gamma Image
Apply the same gamma correction to many images at once, right in your browser.
FreeText
Add Line Breaks
Add line breaks after each delimiter, every N characters (word-wrapped or exact), or every N words, with a live line count.
FreeCalculators
ACT Score Calculator
Calculate your ACT composite score from your four section scores, or compute your superscore across multiple test attempts.
FreeText
Acronym Generator
Turn a phrase into its acronym instantly, with a letter-by-letter breakdown and an optional minor-word-skipping mode.
FreeCalculators
Acres to Square Miles Converter
Convert between acres and square miles in either direction, live as you type, with a quick-reference table and square meters equivalent.
FreeCalculators
Acid Test Ratio Calculator
Calculate the acid test (quick) ratio from balance sheet totals or individual quick assets, with a healthy/moderate/weak read.