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Ovulation Calculator
Calculate your estimated ovulation date and fertile window based on your cycle length and last period.
Ovulation Date
Aug 12, 2026
Fertile Window
Aug 7, 2026 - Aug 13, 2026
Cycle Day View
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Period
Fertile
Ovulation
Next 3 Periods
Period 1: Aug 26, 2026 (Wed)
Period 2: Sep 23, 2026 (Wed)
Period 3: Oct 21, 2026 (Wed)
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Why Use Our Ovulation Calculator?
Ovulation Date Calculation
Estimates ovulation day based on your last period and cycle length using the standard LH surge timing method.
Fertile Window Display
Shows the five days before ovulation plus the day after - the full fertile window when conception is most likely.
Adjustable Cycle Length
Enter your actual cycle length from 21 to 35 days for a more personalized estimate than a fixed 28-day assumption.
Visual Cycle Calendar
A color-coded day grid shows each phase of your cycle - period days, fertile window, and ovulation day at a glance.
Next Three Periods
Predicts the start dates of your next three periods based on your cycle length so you can plan ahead.
100% Private
Your dates are never sent to any server. All calculation happens locally in your browser.
Frequently Asked Questions
How is ovulation date calculated?
Ovulation typically occurs 14 days before the next period. The calculator subtracts 14 from your cycle length and adds that to the first day of your last period.
What is the fertile window?
The fertile window is the 5 days before ovulation plus the day of ovulation and the day after - the days when conception is most likely because sperm can survive up to 5 days.
How accurate is this calculator?
It is an estimate based on average cycle patterns. Actual ovulation varies based on stress, illness, and hormonal changes. An ovulation test kit provides more accurate real-time detection.
What cycle length should I enter?
Enter your typical cycle length from the first day of one period to the first day of the next. The average is 28 days, but normal cycles range from 21 to 35 days.
What if my cycle is irregular?
This calculator works best for regular cycles. If your cycle varies significantly, the fertile window estimate will be less accurate. Tracking with OPK tests is recommended.
Is this ovulation calculator free?
Yes. Completely free with no account or sign-up required.
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View allGIF EditorCombine, trim, speed up, slow down, and add fade transitions to animated GIFs on a timeline, then export as a single GIF. Runs entirely in your browser.MOV to MP4 ConverterConvert MOV, MKV, AVI, and WebM videos to MP4. Uses a fast lossless remux when possible and falls back to H.264/AAC re-encoding otherwise. Runs entirely in your browser.Audio ToolsA hub for the audio tools: extract audio from a video, replace a video's audio track, or trim audio to a range. Each opens its own tool.Video to MP3Extract the audio from any video and save it as an MP3. Works with MP4, MOV, MKV, and WebM, entirely in your browser.Replace Audio in VideoSwap a video's audio track for a voiceover, song, or any other audio. The video stream is kept exactly as-is, in your browser.Trim AudioCut an audio file down to the exact section you need using a waveform, and download it as MP3 or WAV, entirely in your browser.MP4 to WebM ConverterConvert MP4 videos to WebM using VP9 video and Opus audio. Runs entirely in your browser.WebM to MP4 ConverterConvert WebM videos to MP4 with H.264 and AAC for the widest playback compatibility. Runs entirely in your browser.MKV to MP4 ConverterConvert MKV videos to MP4. Uses a fast lossless remux when possible and falls back to re-encoding otherwise. Runs entirely in your browser.AVI to MP4 ConverterConvert AVI videos to MP4 for modern playback compatibility. Runs entirely in your browser.MOV to GIF ConverterTurn a MOV video clip into an animated GIF with adjustable frame rate and size. Runs entirely in your browser.MP4 to GIF ConverterTurn an MP4 video clip into an animated GIF with adjustable frame rate and size. Runs entirely in your browser.Video TrimmerCut a video down to the exact clip you need with a simple start and end range. Runs entirely in your browser.Mute VideoRemove the audio track from a video in one click. Runs entirely in your browser.Rotate VideoRotate a sideways or upside-down video 90, 180, or 270 degrees, or flip it horizontally or vertically. Runs entirely in your browser.Video CompressorShrink a video's file size with an adjustable quality slider, with before and after sizes shown. Runs entirely in your browser.Video ResizerResize a video to 1080p, 720p, 480p, Instagram Square, Instagram Story, or any custom dimensions. Runs entirely in your browser.Extract Video FrameGrab a single still frame from any moment in a video and save it as a JPG or PNG. Runs entirely in your browser.Crop VideoCrop a video by dragging a selection over a preview frame, then apply it to the whole clip. Runs entirely in your browser.Watermark VideoAdd a text watermark to a video in any of 9 positions, with adjustable size, color, and opacity. Runs entirely in your browser.Merge VideosCombine multiple video clips into one file, in any order you choose. Runs entirely in your browser.Split VideoSplit a video into equal parts or at custom timestamps, and download all the parts as a ZIP. Runs entirely in your browser.Video Speed ChangerSpeed up or slow down a video from 0.25x to 4x, with audio pitch handled automatically. Runs entirely in your browser.Reverse VideoPlay a video backwards. Best for short clips, since reversing needs to hold the whole video in memory. Runs entirely in your browser.Audio ConverterConvert audio between MP3, WAV, OGG, M4A, and FLAC. Runs entirely in your browser.OGG to MP3Convert OGG audio files to MP3 for playback on any device or player. Batch convert many files at once, entirely in your browser.Audio CompressorShrink an audio file's size with a selectable bitrate, with before and after sizes shown. Runs entirely in your browser.Merge AudioCombine multiple audio files into one track, in any order you choose. Runs entirely in your browser.Audio Speed ChangerSpeed up or slow down an audio track from 0.5x to 3x. Runs entirely in your browser.Audio Volume BoosterBoost or reduce an audio track's volume, or normalize it to a standard loudness level in one click. Runs entirely in your browser.
Games and Puzzles (17)
View allMemory MatchClassic card-matching memory game with three difficulty levels. Tracks your moves and time, and saves your best score so you can try to beat it.Tic-Tac-ToePlay Tic-Tac-Toe against a friend or the computer. Choose an easy opponent or an unbeatable one, and track your win, loss, and draw record.HangmanClassic word-guessing game with Animals, Countries, Food, and Everyday Objects categories. Guess letters before you run out of tries.2048Slide and merge tiles to reach 2048. Play with arrow keys or swipe on mobile, and try to beat your best score.Word Search GeneratorGenerate a word search puzzle from a theme or your own word list, then click the first and last letter of a word to find it.SudokuPlay Sudoku with three difficulty levels. Every puzzle is generated with a guaranteed unique solution, with notes mode and a mistake checker.Daily WordA new 5-letter word puzzle every day. Guess the word in 6 tries, build your streak, and share your result.MinesweeperClassic Minesweeper with three difficulty levels. Your first click is always safe, flag mode works great on mobile, and your best time is saved.Sliding PuzzleThe classic 8-puzzle and 15-puzzle sliding tile games. Every shuffle is guaranteed solvable, with a move counter and best score saved.Lights OutClick a light to toggle it and its neighbors. Turn every light off to win, with three difficulty levels and your best move count saved.Simon SaysWatch the color and sound pattern, then repeat it back. Each round adds one more step. How many rounds can you remember?Reaction Time TestClick as fast as you can the moment the screen turns green. Catches false starts, tracks your average, and saves your best reaction time.Dots and BoxesTake turns drawing lines between dots. Complete the fourth side of a box to claim it and get an extra turn. Most boxes wins against the computer.Connect FourDrop pieces to connect four in a row before the computer does. The AI thinks several moves ahead, so it plays a genuinely strong game.MastermindCrack the hidden 4-color code in 10 guesses or fewer using black and white peg feedback. Tracks your wins, losses, and fewest guesses to solve.SnakeClassic arcade Snake. Steer with arrow keys or swipe on mobile, eat food to grow, and avoid the walls and your own tail. Best score saved.Tower of HanoiMove the whole stack of disks to the last peg in the fewest moves possible. Choose from 3 to 7 disks and compare against the mathematical minimum.
Developer Tools (8)
Password GeneratorGenerate strong, random passwords with custom length and character sets. Includes strength indicator and copy button.Base64 Encoder/DecoderEncode text or files to Base64 and decode Base64 strings back to plain text. Supports URL-safe mode.Number to WordsConvert any number into English words. Supports up to trillions, ordinal mode, and currency format.Screen Resolution CheckerCheck your screen resolution, viewport size, device pixel ratio, color depth, browser, and OS instantly.Aspect Ratio CalculatorCalculate the aspect ratio of any dimensions, or find a missing width or height from a known ratio.Vanishing Note - Self-Destructing NotesSend a secret note that self-destructs after being read. Encrypted in your browser, shared as a single-use link.Script SplitterPaste a long script and split it into copy-ready chunks of any character limit. Copy each part one at a time with a single click.Print PadA multi-page document editor with text formatting, tables, images, margins, and find and replace. Print or save as PDF straight from your browser.
Fun and Random (19)
View allDice RollerRoll any number of dice in any combination - d4, d6, d8, d10, d12, and d20. Instant results.Coin FlipperFlip a virtual coin and get heads or tails instantly. Flip multiple coins at once.Random Quote GeneratorGet a random inspirational quote with one click. Hundreds of famous quotes from history's greatest minds.Random Number GeneratorGenerate random numbers within any range. Generate multiple numbers and optionally keep them unique.Yes or No GeneratorCan't decide? Get a random yes or no answer instantly. Includes a maybe option for tough decisions.Keyboard TesterTest every key on your keyboard online. Choose from Windows full, TKL, 75%, 65%, 60%, Mac, and MacBook layouts.Dead Pixel TesterCheck your monitor for dead or stuck pixels using solid color screens. Red, green, blue, black, white, and more.Camera Shutter Count CheckerUpload a JPEG photo to check your camera's shutter count and view full EXIF camera details. Supports Canon and Nikon shutter count detection.Magic 8-BallAsk the Magic 8-Ball any yes-or-no question and shake it for an answer. All 20 classic responses, just like the original toy.Typing Speed TestTest your typing speed and accuracy with 10 different passages. Live WPM tracking and character-level feedback.Pros and Cons ListBuild a structured pros and cons list for any decision. See the balance at a glance, then copy or print your list.Baby Name GeneratorGenerate baby name ideas by gender, origin, starting letter, and meaning. Find the perfect name for boys, girls, or unisex.Username GeneratorGenerate unique username and gamertag ideas from your name or keywords. Choose a style and get instant results.Fantasy Name GeneratorGenerate fantasy names for characters, races, and places. Perfect for D&D, fiction writing, and worldbuilding.Business Name GeneratorGenerate creative business and brand name ideas from your keywords. Pick a style and get instant suggestions.New Year's Resolution TrackerSet New Year's resolutions, break them into milestones, and track your progress throughout the year.Spin the WheelAdd names, spin the wheel, and let it decide. Great for random picks, giveaways, and classroom activities.Random Team GeneratorPaste a list of names and split them into random, balanced teams instantly. Set the number of teams, add custom team names, and re-shuffle as many times as you like.Chore WheelBuild a weekly chore schedule for your household. Add people and tasks, then randomize assignments fairly or set them manually.
Design and Color (4)
Color ConverterConvert colors between HEX, RGB, HSL, and HSB formats instantly with a live color preview.Random Color GeneratorGenerate random colors with their HEX, RGB, and HSL values. Copy any format instantly.QR Code GeneratorGenerate a QR code from any URL or text. Download as PNG instantly. Free, private, no sign-up.Color Palette GeneratorGenerate harmonious color palettes from any base color. Complementary, analogous, triadic, and more.
Time Tools (6)
Alarm ClockFree online alarm clock. Set an alarm time and get a browser alert and sound when it goes off.Online TimerFree countdown timer. Set hours, minutes, and seconds and get an alert when the time is up.StopwatchFree online stopwatch with lap times. Start, stop, and reset with a single click.Time Zone ConverterConvert time between any two cities or time zones instantly. Great for scheduling across countries.Sleep CalculatorCalculate the best time to go to sleep or wake up based on 90-minute sleep cycles.Holiday CountdownLive countdowns to major holidays - Christmas, New Year, Thanksgiving, Halloween, and more.