Calculators Directory — Free Online Calculators by Category

All Free Online Calculators & Simulators

• FPS Calculator – Estimate gaming framerate by CPU, GPU, and target resolution
• About FPS Calculator – Learn about FPS Calculator: our hardware testing methodology, frame pacing analysis, and free gaming optimization tools.
• Bottleneck Calculator – Identify CPU and GPU performance bottlenecks in PC builds
• PSU Wattage Calculator – Calculate recommended power supply wattage for your PC components
• RAID Storage Calculator – Calculate usable capacity, fault tolerance, and speed across RAID levels
• FOV Calculator – Calculate optimal field of view for screen size and distance
• Resolution Scale Calculator – Calculate internal render pixel resolutions and performance gains
• eDPI Calculator – Calculate true effective sensitivity across mouse DPI and in-game sensitivity
• Sensitivity Converter – Convert mouse sensitivity seamlessly between different FPS games
• Input Lag Calculator – Measure total display and system latency from click to photon
• Desk Height Calculator – Calculate ergonomic desk and chair heights based on your stature
• Darts Checkout Calculator – Find optimal double-out combination paths for 501 and 301 match finishes
• Food Label Macro Split Calculator – Analyze macronutrient calorie percentages and grams from food nutrition facts labels
• Percentage Calculator – Calculate percent increases, decreases, differences, and fractions effortlessly
• Crypto Profit Calculator – Calculate trading gains, percentage return, and exchange fees for cryptocurrencies
• PPI / DPI Calculator – Calculate pixels per inch (PPI) and display sharpness from resolution
• Download Time Calculator – Estimate file download and upload completion times by connection speed
• Battery Runtime Calculator – Estimate battery life and discharge time based on capacity and power draw
• CPM & CPC Calculator – Calculate cost per mille impressions, cost per click, and digital ad campaign budgets
• Image Print Size Calculator – Calculate maximum print size in inches and cm for high-quality photos
• Video Bitrate Calculator – Estimate video file size from duration, resolution, and encoding bitrate
• Wire Gauge (AWG) Calculator – Determine proper wire gauge, ampacity, and voltage drop across distances
• College GPA Calculator – Calculate semester and cumulative grade point averages on the 4.0 scale
• Discount & Sale Calculator – Find final sale prices, money saved, and sales tax additions instantly
• Temperature Converter – Convert instantly between Celsius (°C), Fahrenheit (°F), and Kelvin (K) scales
• Daily Water Intake – Calculate recommended hydration liters based on weight, activity, and climate
• Concrete Slab Calculator – Calculate required volume in cubic yards, cubic meters, and pre-mixed bags for slabs
• ROI Calculator – Calculate return on investment percentage and annualized efficiency
• Wall Paint Calculator – Estimate gallons or liters of paint needed based on wall surface area, doors, and coats
• Aspect Ratio Calculator – Find proportional dimensions and aspect ratios like 16:9, 21:9, and 4:3
• Tile & Flooring Calculator – Calculate total tiles, square footage, boxes, and recommended cutting waste extra
• Bandwidth Calculator – Convert network data transfer rates between bytes, bits, and per-second metrics
• Frame Time Calculator – Convert FPS to frame time in milliseconds for smooth pacing
• Monitor Distance Calculator – Calculate recommended ergonomic viewing distance for screen size and resolution
• PC Electricity Cost – Calculate monthly and yearly electricity bills from PC wattage and usage
• VRAM Calculator – Estimate GPU video memory usage for gaming resolutions and textures
• Random Name Picker Wheel – Spin a custom fair wheel to select winners, raffle prizes, and random decisions
• Virtual Dice Roller – Roll single or multiple polyhedral dice (d4, d6, d8, d10, d12, d20) with physics
• Wedding Seating Plan – Organize guests, round tables, and rectangular seating layouts easily
• Online Countdown Timer – Custom digital stopwatch and countdown timer with sound alerts and pause controls
• 2 Minute Timer – Preset 120-second timer ideal for teeth brushing, meditation, and tea steeping
• 1 Minute Timer – Quick 60-second preset countdown for workouts, cooking, and focus intervals
• 3 Minute Timer – Preset 180-second clock perfect for boiling eggs, quick stretches, and board game turns
• Color Palette from Image – Extract dominant color palettes, HEX codes, and RGB values from photos
• Online Coin Flip – Flip realistic heads or tails coins with streak counters and true 50/50 odds
• Placeholder Image Generator – Generate custom placeholder mock images with custom dimensions and colors
• Mortgage Calculator – Calculate monthly mortgage payments, total interest, and amortization schedule
• Amortization Calculator – View month-by-month principal and interest breakdown over the loan life
• Mortgage Early Payoff – See how extra monthly payments reduce loan tenure and save thousands in interest
• HELOC Payment Calculator – Calculate interest-only draw period and principal repayment phases for home equity lines
• Down Payment Calculator – Calculate required savings, percentage tiers, and loan-to-value impact
• Compound Interest Calculator – Calculate investment growth and compounding returns over time with regular deposits
• Certificate of Deposit (CD) – Calculate total maturity value and earned interest on fixed-term deposits
• Compound Savings Calculator – Forecast final savings balances from initial principal, monthly deposits, and APY
• APR to APY Calculator – Convert nominal interest rate to true effective annual yield with fees
• Auto Loan Calculator – Calculate monthly vehicle financing payments, trade-in value, taxes, and interest
• Personal Loan Calculator – Calculate monthly payments, total repayment costs, and APR for personal loans
• Simple Interest Calculator – Calculate linear non-compounding interest earned or paid across time
• SIP Calculator – Estimate future wealth from disciplined systematic investment plans
• Index Fund Return Calculator – Project long-term compound growth of low-cost index funds and ETFs
• Average Return Calculator – Compare simple arithmetic mean versus compound geometric average return
• Portfolio Return Calculator – Calculate asset-weighted expected returns across stocks, bonds, and cash
• IRR Calculator – Compute internal rate of return for uneven multi-year cash flow streams
• Real Estate IRR Calculator – Evaluate rental property yield, mortgage leverage, and exit sale proceeds
• Payback Period Calculator – Find the exact number of years required to break even on an initial outlay
• Discounted Payback Period – Account for time value of money when calculating project break-even points
• Future Value (FV) Calculator – Calculate what a present sum will be worth in the future at a set interest rate
• Net Present Value (NPV) – Evaluate capital project profitability by discounting expected future cash inflows
• Present Value (PV) Calculator – Discount a single future sum back to its equivalent value in today's dollars
• Present Value of Annuity – Calculate lump sum required today to fund a steady series of future withdrawals
• Future Value of Annuity – Calculate total accumulated wealth from repeating regular fixed contributions
• Time Value of Money (TVM) – Solve any financial variable: PV, FV, Interest Rate, Number of Periods, or Payment
• Retirement Calculator – Estimate retirement savings needs, nest egg longevity, and monthly drawdown
• Retirement Planning – Model life expectancy, inflation adjustments, and annual portfolio contributions
• Retirement Income Calculator – Combine Social Security, pensions, annuities, and investments into a single monthly budget
• Private Pension Calculator – Calculate private defined contribution pot growth and tax-free lump sum rules
• 401(k) Calculator – Project retirement wealth growth from salary deferrals and employer matching
• 401(k) Contribution Calculator – Optimize payroll deferrals to maximize employer match without exceeding IRS limits
• 401(k) Withdrawal Calculator – Calculate post-tax retirement distributions and compare early penalty rules
• 401(k) Loan Calculator – Evaluate interest paid back to yourself versus lost compound investment growth
• Roth 401(k) vs Traditional – Compare tax-free retirement growth against upfront pre-tax deductions
• Social Security Calculator – Estimate monthly retirement benefit payout across early, full, and delayed ages
• Social Security Age Strategy – Find your break-even age between claiming at age 62 versus waiting until age 70
• SSDI Disability Estimator – Estimate monthly disability benefits from your indexed lifetime earnings record
• Fixed Annuity Calculator – Estimate guaranteed monthly income generated from a fixed annuity investment
• Immediate Annuity (SPIA) – Convert a lump-sum premium into instant lifelong guaranteed income
• Pension vs Lump Sum – Decide whether to take employer pension as monthly payments or a one-time lump sum
• Annuity Quote Comparison – Compare payout rates, fees, and guaranteed periods between different insurance providers
• Take-Home Pay Calculator – Calculate take-home pay after federal, state, FICA taxes, and benefit deductions
• Paycheck Calculator – Convert hourly wages, overtime hours, and salary pay frequencies into net checks
• US Army Body Fat Calculator – Calculate body fat percentage using standard tape test circumference equations
• Army Height & Weight Standards – Check screening compliance against maximum allowable enlistment weight tables
• BMR Basal Metabolism – Calculate minimum resting calories needed to sustain vital organ functions at rest
• Resting Metabolic Rate (RMR) – Estimate daily energy burn under comfortable non-active resting conditions
• Treadmill Calorie Burn – Estimate energy expenditure from walking or running by speed, weight, and time
• Incline Treadmill Calories – Calculate extra calories burned when walking uphill with treadmill deck grade percentages
• One-Rep Max (1RM) – Calculate maximum single lift capability across Brzycki, Epley, and Lombardi formulas
• Powerlifting Total Calculator – Track combined bench press, squat, and deadlift numbers with strength coefficient scores
• Target Heart Rate Zones – Calculate fat burning, aerobic, and anaerobic intensity training pulse zones
• Max Heart Rate (MHR) – Estimate age-based maximum heart rate using Tanaka, Gellish, and Fox equations
• Pregnancy Tracker & Milestones – Track gestational age, current trimester, and fetal milestone weeks from LMP
• Due Date Calculator – Predict estimated delivery date by Naegele's rule from last period or ultrasound
• Conception Date Calculator – Estimate probable fertilization dates and fertile window from period timeline
• Reverse Due Date Calculator – Backtrack conception and intercourse dates from your expected delivery due date
• Ovulation & Fertile Days – Predict upcoming ovulation dates and peak fertile days for family planning
• Implantation Date Calculator – Estimate embryo uterine implantation window and earliest home pregnancy test days
• Pregnancy Weight Gain – Track weekly pregnancy weight gain ranges recommended by clinical IOM guidelines
• Pre-Pregnancy BMI Tracker – Classify pre-pregnancy BMI category and view clinical IOM gestational reference ranges
• Carbohydrate Intake Calculator – Calculate total carb grams, net carbs, and energy share from nutrition labels
• Fat Intake Calculator – Analyze total fat grams, saturated fat, and fat calorie percentages from food labels
• TDEE Calculator – Estimate total daily energy expenditure based on physiological metabolic formulas
• eGFR Kidney Function – Estimate glomerular filtration rate using the validated 2021 CKD-EPI creatinine equation
• Body Frame Size Calculator – Determine small, medium, or large frame build from wrist circumference and height
• Body Surface Area (BSA) – Estimate human body surface area in square meters using Mosteller and DuBois formulas
• Federal Income Tax Calculator – Calculate federal income tax brackets, marginal tax rates, and total tax owed
• Yes or No Generator – Free yes or no generator: get an instant, unbiased yes or no answer to any question with one click. Switch to three-answer mode or share a custom query.
• Random Card Picker – Free random card picker: draw 1 to 52 playing cards from a standard deck online. Choose draw with or without replacement with fair Fisher-Yates shuffling.
• Random Number Generator – Free random number generator: generate unbiased random numbers within any range. Customize minimum, maximum, count, and duplicates. Instant and private.
• Random Letter Picker – Free random letter picker: draw random letters from the English alphabet or custom sets. Filter vowels or consonants, pick with or without replacement.
• Rock Paper Scissors Online – Play Rock Paper Scissors online against fair computer AI or 2-player mode. Includes classic 3-choice and 5-choice Lizard Spock modes with win/loss streak stats.
• Probability Calculator – Calculate probabilities for single events, independent events, mutually exclusive events, and conditional probability with formulas and step-by-step math.
• Permutation & Combination Calculator – Calculate permutations (nPr) and combinations (nCr) with or without repetition. Features exact factorial expansions and step-by-step math solutions.
• Screen Dimension Calculator – Calculate screen width, height, display area, and aspect ratio from diagonal size. Supports 16:9, 21:9, 4:3, and custom ratios in inches and cm.
• Download Time Calculator – Calculate download and upload times from file size and internet speed. Supports GB, MB, Mbps, and network protocol overhead. Free and fast.
• Mouse Sensitivity Converter – Convert mouse sensitivity between CS2, Valorant, Fortnite, Apex, and Overwatch 2. Calculate cm/360, eDPI, and match your aim across any DPI. Free.
• Refresh Rate to Frame Time Calculator – Calculate display frame time from refresh rate (Hz to ms). Compare 60Hz, 144Hz, 240Hz, 360Hz, and 540Hz input latency, frame budgets, and VRR scanout.
• Ping & Network Latency Calculator – Calculate ping and round-trip time (RTT) from distance and fiber propagation. Estimate routing hops, bufferbloat, and gaming server tickrate limits.
• Hourly to Salary Calculator – Convert your hourly wage into annual, monthly, bi-weekly, and weekly salary. Calculate overtime pay, paid time off (PTO), and 2,080 standard hours.
• Salary to Hourly Calculator – Convert your annual salary into exact hourly wage, daily pay, bi-weekly, and monthly rates. Calculate adjusted hourly pay with paid vacation and holidays.
• Inflation Calculator – Calculate cumulative inflation, future purchasing power loss, and historical CPI value comparisons from 1913 to present day with official CPI-U data.
• Sales Tax Calculator – Calculate total price including sales tax or reverse calculate original pre-tax amount. Break down combined state, county, and local city tax rates.
• Tip Calculator – Calculate tip amounts, split bills evenly among multiple people, and round up totals. Includes 15%, 18%, 20%, and custom gratuity percentage presets.
• Running Pace Calculator – Calculate your running pace per mile or km, finish times for 5K, 10K, half & full marathon, and target split times with interactive race distance presets.
• Swimming Pace Calculator – Calculate swimming pace per 100m or 100yd, predict finish times for 400m to 1500m, and determine Critical Swim Speed (CSS) training zones.
• Lean Body Mass Calculator – Calculate your lean body mass (LBM) and body fat percentage using Boer, James, and Hume formulas in kg or lbs with body composition breakdown.
• Sweat Rate Calculator – Calculate your hourly sweat rate, total fluid loss, and dehydration percentage from pre- and post-exercise weight. Get tailored hydration guidelines.
• Powerlifting Score Calculator – Calculate your DOTS score, Classic Wilks, Wilks 2.0, and IPF GL points from your squat, bench press, deadlift, and body weight. Compare strength levels.
• BPM to MS Delay & Reverb Time Calculator – Calculate delay times, reverb pre-delay, and decay settings in milliseconds and Hertz from any song tempo (BPM). Free musical delay chart.
• Audio File Size & Sample Rate Calculator – Calculate audio file size and bitrates for WAV, FLAC, MP3, and AAC across sample rates (44.1kHz to 192kHz) and bit depths. Multi-track session storage.
• Speaker Distance & Decibel Loss Calculator – Calculate sound pressure level (dB SPL) loss over distance using the inverse square law, boundary room gain, amplifier wattage, and target listening volume.
• Subwoofer Box & Port Tuning Calculator – Calculate sealed and ported subwoofer box volume, Helmholtz port length, tuning frequency, F3 cutoff, and Thiele-Small T/S alignment.
• Aspect Ratio & Canvas Crop Calculator – Calculate aspect ratio conversions, letterbox/pillarbox black bars, center crop dimensions, pixel loss, and social media video resizing.
• Random Team Generator – Free random team generator: quickly split names into balanced random teams or custom groups with skill balancing and CSV export.
• Truth or Dare Online – Free truth or dare online generator: spin the bottle and generate 500+ fun questions & dares for parties, friends, and couples.
• Would You Rather Online – Play Would You Rather online for free! Vote on 500+ funny, hard, and crazy dilemmas and see real-time player percentage statistics instantly.
• Raffle Ticket Generator – Free raffle ticket generator & picker: draw fair, unbiased winners from ticket numbers or participant lists for charity raffles and giveaways.
• Never Have I Ever Online – Play Never Have I Ever online for free! Reveal 500+ funny, crazy, and spicy questions with a built-in finger life tracker and global voting stats.
• Random Password Generator – Free random password generator: create strong passwords, Diceware passphrases, and numeric PINs with client-side cryptographic security and crack-time metrics.
• Random Country Generator – Free Random Country Generator: pick countries at random with flags, capital cities, populations, currencies, and maps. Filter by continent or draw multiple.
• Secret Santa Generator – Free Secret Santa Generator: organize online gift exchanges with exclusions, spending limits, and confidential reveal links. No email sign-up required.
• Fake Data Generator – Free Fake Data Generator: create realistic mock user profiles, addresses, and test datasets. Export to JSON, CSV, or SQL database inserts instantly.
• Random Word Generator – Free Random Word Generator: pick random words by difficulty for Pictionary, Charades, Catchphrase, and vocabulary practice with a built-in game timer.
• Online Metronome – Free Online Metronome: accurate audio ticks, tap tempo BPM detector, time signatures (2/4, 3/4, 4/4, 6/8), and tempo markings from Largo to Presto.
• Binaural Beats & Noise Generator – Free Binaural Beats & Ambient Noise Generator: Alpha, Beta, Theta, and Delta waves with White, Pink, and Brown noise plus built-in sleep & focus timer.
• Reaction Time Test – Free Reaction Time Test: measure reflex speed in milliseconds with random red-to-green triggers, false start detection, 5-round average, and percentile tier.
• Typing Speed Test (WPM) – Test your typing speed and accuracy with our free 60-second WPM test. Real-time words per minute, CPM, error analysis, and speed ranking certificate.
• Online Stopwatch – Free online stopwatch with millisecond precision, lap split tracking, fastest and slowest lap badges, CSV export, and keyboard shortcuts (Space, L, R).
• Tier List Maker – Create custom tier lists online for gaming, movies, characters, and sports. Customizable S-to-F rows, colors, image uploads, and instant high-res PNG export.
• QR Code Generator – Create custom color QR codes online for URLs, Wi-Fi, text, and email. Instant high-res PNG & SVG download with zero tracking and 100% offline privacy.
• Digital Scoreboard Online – Free digital scoreboard online for basketball, soccer, board games & esports. Custom team names, period counter, fouls, match timer, buzzer horn, and hotkeys.
• Bingo Card Generator – Free bingo card generator & virtual caller online. Standard 75-ball B-I-N-G-O cards, custom words, free center space, printable sheets & automatic caller.
• Tarot Card Reading Online – Free tarot card reading online with full 78-card Rider-Waite deck. Daily single card, 3-card spread & Celtic Cross with upright and reversed interpretations.