Fun
Love compatibility, random generators, GPA, and just-for-fun tools.
85 calculators in Fun
Relationship
Academic
Certification ROI Calculator
Calculate the return on investment of professional certifications.
College Degree ROI Calculator
Estimate the return on investment for a college degree, including opportunity cost and break-even analysis.
GPA Calculator
Calculate your Grade Point Average from course grades and credits.
Grade Calculator
Calculate weighted grades and what you need on finals.
Language Learning Time Calculator
Estimate how long it takes to learn a new language based on FSI data.
Online Course Value Calculator
Evaluate the cost per hour of content, estimated completion timeline, ROI from salary increases, and how it compares to university, bootcamps, and books.
Games
Blackjack House Edge Calculator
Estimate the casino house edge in blackjack based on number of decks and table rules.
Coin Flip Simulator
Flip a virtual coin with statistics tracking.
Dice Roller
Roll virtual dice for board games and RPGs.
Elo Rating Calculator
Calculate Elo rating changes for chess and competitive games.
Gacha Probability Calculator
Calculate the probability of getting a target item from gacha pulls.
Game Cost Per Hour Calculator
Calculate the cost per hour for your games and compare up to 5 titles to find the best value.
Kelly Criterion Calculator
Calculate the optimal bet size using the Kelly Criterion formula to maximize long-term bankroll growth.
Lottery Odds Calculator
Calculate your odds of winning any lottery format.
Poker Probability Calculator
Calculate the odds of hitting your draw in Texas Hold'em poker based on outs, cards remaining, and streets.
Lottery Payout Calculator
Compare lump sum vs annuity lottery payouts after federal and state taxes.
Tools
Battery Life Calculator
Estimate device battery life based on capacity and usage.
Bitrate Calculator
Calculate video/audio bitrate, file size, and storage requirements for your media.
Book Royalties Calculator
Estimate author earnings from book sales. Calculate per-copy royalties, gross earnings, net income, and advance earn-out copies.
Color Converter
Convert between HEX, RGB, HSL color formats.
Crop Factor Calculator
Calculate the full-frame equivalent focal length, depth-of-field equivalent aperture, and field of view for any camera sensor.
Data Usage Calculator
Estimate monthly data usage from your online activities.
Depth of Field Calculator
Calculate near focus limit, far focus limit, total depth of field, and hyperfocal distance from focal length, aperture, subject distance, and sensor size.
Download Time Calculator
Estimate file download time based on your connection speed.
DPI Calculator
Calculate DPI from image dimensions and print size, or find maximum print size from resolution and target DPI.
Fabric Yardage Calculator
Estimate how much fabric you need for any sewing project based on project type, measurements, fabric width, and pattern matching.
Focal Length Calculator
Calculate the angle of view and 35mm equivalent focal length for any camera lens and sensor size.
Generation Checker
Find which generation you belong to based on your birth year.
Knitting Gauge Calculator
Adjust any knitting pattern to your personal gauge. Calculate exact stitch and row counts for your desired dimensions.
Laser Cutting Cost Calculator
Estimate laser cutting time and cost by material type, thickness, and machine hourly rate.
Morse Code Translator
Translate text to Morse code and Morse code back to text.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases.
PC Build vs Prebuilt Calculator
Compare the total cost of building a custom PC from individual components versus buying a prebuilt system to find which option costs less.
Photo Print Size Calculator
Check if your image resolution is sufficient for common print sizes at a target DPI.
Pixel Density (PPI) Calculator
Calculate pixels per inch, pixel pitch, and display quality from screen resolution and size.
3D Print Cost Calculator
Estimate the total cost of a 3D print including filament, electricity, and printer depreciation.
QR Code Generator
Generate QR codes for URLs and text.
Screen Size Calculator
Compare screen sizes and calculate viewing area, pixel density, and dimensions.
Streaming vs Purchase Calculator
Compare total cost of streaming subscriptions versus buying media outright to find which option saves more money.
Subnet Calculator
Calculate IPv4 subnet details from an IP address and CIDR prefix.
Unit Price Calculator
Compare unit prices to find the best deal when shopping.
Pets
Productivity
AI vs Manual Work Calculator
Compare AI-assisted work cost and time vs manual work.
Decision Matrix Calculator
Compare options using weighted criteria to find the best choice.
Pomodoro Productivity Calculator
Plan your workday with the Pomodoro Technique. Calculate total pomodoros, focus time, breaks, and estimated tasks.
Reading Time Calculator
Estimate how long it takes to read a text.
Typing Speed Test
Test and measure your typing speed in WPM.
Word Counter
Count words, characters, sentences in text.
Developer
AI Token Cost Calculator
Estimate API costs for GPT-4o, Claude, Gemini, and other LLMs based on token usage.
AI Token & Word Count Calculator
Convert between AI tokens, words, and characters with cost estimation.
API Rate Limit Calculator
Plan your API usage by calculating max throughput, operations per day, delay between requests, and burst capacity.
AWS Lambda vs EC2 Cost Calculator
Compare serverless (Lambda) vs server (EC2) monthly costs. Find the break-even point to determine which is more cost-effective for your workload.
Base64 Encoder / Decoder
Encode and decode Base64 strings with full Unicode support.
Cloud vs Local Storage Cost Calculator
Compare the total cost of cloud storage vs buying local drives over time, including electricity and break-even analysis.
Color Contrast Checker
Check WCAG color contrast ratio for web accessibility.
Font Size vs. Distance Calculator
Calculate the minimum readable font size for any viewing distance — screens, signage, presentations, and more.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic hashes from any text input.
JSON Formatter & Validator
Format, validate, and minify JSON with customizable indentation.
Pixel to REM Converter
Convert between pixels and rem units for responsive web design.
Tech Debt Calculator
Estimate the hidden cost of technical debt on your team in time and money.
Text Diff Checker
Compare two texts line by line and highlight the differences.
Timestamp Converter
Convert between various timestamp formats.
Uptime Calculator
Convert uptime percentage to allowed downtime per day, week, month, and year with SLA tier reference.
UUID Generator
Generate random UUID v4 identifiers with cryptographic randomness.
Conversion
Bra Size Calculator
Find your bra size from body measurements.
Clothing Size Converter
Convert clothing sizes between US, UK, EU, and JP standards.
Ring Size Converter
Convert ring sizes between US, UK, EU, and JP sizing systems.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and JP.
Cooking
ABV Calculator
Calculate alcohol by volume (ABV) from original and final gravity for homebrewing.
Baker's Percentage Calculator
Calculate ingredient weights from baker's percentages. Flour is always 100%.
Brix to Specific Gravity Converter
Convert between Brix and specific gravity for brewing and winemaking. Shows Plato equivalent, potential alcohol, and sugar content.
Cooking Measurement Converter
Convert between cups, grams, tablespoons, and more.
Freezer Storage Calculator
Check recommended freezer storage times and expiration dates based on USDA FoodKeeper guidelines.
Meat Shrinkage Calculator
Estimate cooked weight, shrinkage percentage, and cost per serving for any meat type and cooking method.
Pizza Size Calculator
Compare pizza sizes and find the best value per area.
Recipe Scaler
Scale recipe ingredients up or down for any serving size.
Yeast Pitch Rate Calculator
Calculate the correct amount of yeast to pitch for homebrewing. Supports ale and lager pitch rates with liquid and dry yeast options.