Search Tools
182 tools found.
Calculators
Add Business Days To Date
Add or subtract business days from a date, skipping weekends and optional holidays, with a full breakdown of skipped days.
FreeCalculators
Actual Cash Value Calculator
Estimate an item's actual cash value (ACV) for insurance purposes from replacement cost and straight-line depreciation.
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
Acres to Perches Converter
Convert between acres and square perches (rods/poles) in either direction, live as you type, with square meters equivalent.
FreeCalculators
Acres to Hectares Converter
Convert between acres and hectares in either direction, live as you type, with a quick-reference table and square meters equivalent.
FreeCalculators
Acreage Calculator
Calculate acreage for rectangular, square, triangular, or circular land, converted to acres, hectares, and square meters/feet/yards.
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.
FreeCalculators
Acceleration Calculator
Solve for acceleration, final velocity, initial velocity, or time, with g-force and distance-traveled breakdowns.
FreeCalculators
A/B Test Significance Calculator
Check whether an A/B test result is statistically significant, with p-value, z-score, and a confidence interval for the lift.
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.
FreeCalculators
Absolute Value Inequality Solver
Solve |ax + b| compared to c for any of <, ≤, >, or ≥, with step-by-step reasoning and interval notation.
FreeCalculators
Absolute Value Equation Solver
Solve |ax + b| = c step by step, with both cases explained and verified.
FreeCalculators
Absolute Value Calculator
Find the absolute value of a number or arithmetic expression with a step-by-step explanation, or process a whole batch list at once.
FreeCalculators
555 Timer Calculator
Calculate 555 timer astable-mode frequency, period, and duty cycle from R1/R2/C, or solve backward for the resistors needed to hit a target frequency and duty cycle.
FreeCalculators
529 College Savings Calculator
Project 529 education savings growth and see what percentage of a future college cost your savings are on track to cover.
FreeCalculators
401(k) Calculator
Project your 401(k) retirement savings growth with employer match, salary increases, and inflation-adjusted real value.
FreeCalculators
3-Phase Power Calculator
Find real, apparent, and reactive power from voltage, current, and power factor, or solve for current from a known load. Free, private, runs in your browser.
FreeCalculators
3D Surface Plotter
Plot any function z = f(x, y), from a paraboloid to a saddle to a Gaussian, as a rotatable, color-coded 3D wireframe surface. Free, private, runs in your browser.
FreeCalculators
3D Distance Calculator
Find the straight-line distance between two points in 3D space, with midpoint, 2D, and Manhattan distance breakdowns included. Free, private, runs in your browser.
FreeGame
24 Game Solver & Trainer
Solve the classic 24 Game instantly, or practice against the clock with an auto-generated, guaranteed-solvable puzzle and live scoring. Free, private, runs in your browser.
FreeCalculators
1099 Tax Calculator
Estimate your self-employment tax and federal income tax on 1099 income, with a quarterly payment breakdown and real IRS deadline dates. Free, private, runs in your browser.
FreeCalculators
0-60 & Quarter Mile Calculator
Estimate a car's quarter mile time and trap speed from its horsepower and weight, with a power-to-weight breakdown and reference-car comparison. Free, private, runs in your browser.
FreeCalculators
1031 Exchange Calculator
Estimate deferred and taxable gain on a 1031 like-kind property exchange, with a recapture vs. capital gains tax breakdown and a 45/180-day deadline tracker. Free, private, runs in your browser.
FreeGame
Spin the Wheel (Wheel of Names)
Turn any list into a spinning wheel and get a fair random pick in seconds. Free, no sign-up, everything runs in your browser.
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.
FreeVideo
Webcam Video Recorder
A real online camera in your browser: record video with optional microphone audio, take photos, choose your resolution (480p/720p/1080p), pause and resume, add a 3-second countdown, and download everything as standard video or PNG files.
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.
FreeHardware
Battery Health
Live battery percentage, charging state, and time estimates, plus a session-based full-charge runtime estimate and cycle usage tracker, low-battery and full-charge alerts, battery care tips, and direct steps to check your real battery health on Windows, macOS, Chromebook, and iPhone.
FreeHardware
Screen & Monitor Tester
Check a laptop, monitor, or TV before you buy it secondhand: dead/stuck pixel sweep, light bleed and IPS glow test, burn-in and banding check, refresh rate measurement, motion/ghosting test, and a black/white level test.
FreeHardware
Keyboard Tester
Test every key on your keyboard in the browser: a full 101-key visual layout, key/code/modifier details, rollover and anti-ghosting stats, chatter detection, and a tested-key progress tracker.
FreeMusic
Pitch Detector
A real-time instrument and vocal tuner in your browser: note name, frequency, and cents deviation from your microphone, with guitar/bass/ukulele/violin presets, adjustable A4 reference pitch, and a pitch history graph.
FreeHardware
Mouse Test
Test every part of your mouse in the browser: buttons and side buttons, double-click chatter detection, a click speed (CPS) test, scroll wheel, drag and drop, cursor polling rate, and a click accuracy game.
FreeHardware
Speaker & Headphone Test
Test your speakers and headphones right in the browser: left/right channel checks, a stereo test, a bass tone, and a 20 Hz to 20,000 Hz frequency sweep, all generated live with the Web Audio API.
FreeHardware
Webcam Test
Test your camera and microphone right in the browser: live preview, device switching, resolution and FPS readout, a mic level meter, and snapshot capture.
FreeText
List Randomizer
Shuffle any list, pick random winners for giveaways, and split entries into even groups, all in your browser with an unbiased Fisher-Yates shuffle.
FreeText
Line Counter
An advanced line counter that instantly analyzes your pasted text: duplicate/empty line detection, comment line filtering, regex-powered find & replace, sorting, and prefix/suffix insertion.