Calculate your exact age in years, months, days, hours, and minutes. Find your zodiac sign, day of birth, and countdown to next birthday.
Calculate the right tip for alcohol and beer delivery orders. Factor in heavy cases, delivery distance, minimum tip, and bill splitting for Drizly, Instacart, and liquor delivery. Free, instant, no signup.
Calculate aspect ratios, scale dimensions proportionally, and find dimensions from any ratio. Perfect for video, image, and screen resolution calculations.
Estimate your personalized autophagy onset based on hours fasted, experience level, age, and exercise. See your current fasting phase, milestone tracker, and tips to accelerate cellular repair.
Calculate the mean, median, mode, and range of any set of numbers. Paste or type your numbers, get instant statistical results with a clear breakdown and data summary.
Estimate your blood alcohol content (BAC) using the Widmark equation. Enter weight, gender, drinks consumed, and time elapsed to calculate current BAC level, impairment status, and time to sober up.
Calculate the exact Base64-encoded size of any file or string, or work backward from Base64 length to bytes. Includes data URI overhead. Free, no signup.
Find out your biological age based on 7 key lifestyle factors: BMI, exercise, sleep, smoking, diet, stress, and alcohol. Compare to your chronological age and get a personalised factor breakdown.
Birthstone calculator shows the modern and traditional birthstone for any birth month, with its color, Mohs hardness and care notes. Free, no signup required.
Calculate bitwise AND, OR, XOR, NOT, and shift operations on integers. See results in decimal, hex, and binary with 8, 16, or 32-bit width. Free online bit manipulation tool.
Blood type calculator shows which ABO and Rh blood types a child can inherit from two parents, with probability ranges and the types that are impossible. Free, no signup.
Calculate your Body Mass Index (BMI) instantly. Get health category, healthy weight range, and personalized insights based on your height and weight.
Estimate your basal metabolic rate and daily maintenance calories using the Mifflin-St Jeor formula. Supports metric and imperial units for accurate TDEE planning.
Estimate body fat percentage using U.S. Navy measurements. Get fat mass, lean mass, and category instantly for fitness tracking.
Calculate your break-even point from fixed costs, variable cost per unit, and price. See break-even units, revenue, and margin of safety. Free, browser-based.
Assess your workplace burnout risk with 15 questions based on the Maslach Burnout Inventory (MBI-GS). Get a score, six-dimension breakdown, and actionable recovery steps.
Calculate business days between dates or add/subtract working days. Supports US Federal holidays, custom holidays, and weekend configurations.
Calculate monthly payments, interest cost, origination fees, and payoff savings for a business loan with optional extra monthly payments.
Calculate Compound Annual Growth Rate (CAGR) for your investments. Find the annualized return rate between beginning and ending values over a time period.
Calculate your daily calorie needs based on age, gender, height, weight, and activity level. Get personalized targets for weight loss, maintenance, or muscle gain with macro breakdown.
Calculate calories burned during any exercise using MET values from the Compendium of Physical Activities. Covers 30+ activities including walking, running, cycling, swimming, sports, and daily tasks.
Cat age calculator converts cat years to human years using the AAHA and AAFP feline guidelines, and reports the matching life stage. Free, runs in your browser.
Discover your chronotype with a 10-question quiz based on Dr. Breus's sleep science framework. Get your ideal wake time, peak productivity window, best exercise time, and the perfect IF eating window for your biology.
Calculate compound interest on savings and investments. See how your money grows over time with monthly or yearly compounding and regular contributions.
Assess your cortisol load with 15 symptoms across energy, sleep, weight, mood, digestion, and immunity. Get a score, dimension breakdown, and evidence-based recommendations including your optimal IF eating window.
Calculate cosine similarity, dot product, and Euclidean distance between two vectors instantly. Built for embeddings, RAG pipelines, and ML similarity scoring. Free tool.
Calculate CPM (Cost Per Mille), CPC, CTR, and eCPM for advertising campaigns. Essential tool for marketers, publishers, and advertisers.
Cron next run calculator shows the exact times a cron expression fires next, in your local zone, UTC, or any IANA time zone, with DST gotchas flagged. Free, no signup.
Calculate the specificity of any CSS selector. See the (a,b,c,d) breakdown for IDs, classes, attributes, and elements instantly.
CVSS calculator with the official v3.1 base and temporal equations. Score a vulnerability or paste a vector string from NVD to decode it. Shows impact and exploitability subscores.
Calculate the duration between two dates or add/subtract time periods from a date. Count workdays, weekends, and total days.
Calculate how many days are left until any future date or how many days have passed since a past date. Includes week and month approximations.
Calculate sale prices, find discount percentages, determine original prices, and compute stacked/double discounts. Essential for shopping and retail.
Dog age calculator converts dog years to human years using both the AVMA rule of thumb and the 2020 epigenetic formula, with life stage by breed size. Free, no signup.
Estimate how long it takes to download a file based on your internet speed. Enter file size (MB/GB/TB) and connection speed (Mbps/Gbps) to get instant download time estimates.
Calculate how much an appliance costs to run per day, month, and year. Enter wattage, usage hours, and electricity rate to estimate your power bill. Includes common appliance wattages.
Calculate exponential backoff retry schedules for API calls. Set base delay, multiplier, and max cap to see per-attempt delays with full, equal, or no jitter. Free online tool.
Calculate your daily electrolyte targets during intermittent or extended fasting. Personalized for body weight, activity level, keto status, and sweat rate. Includes a morning/midday/evening dosing schedule.
Plans your personalized 5-day Fasting Mimicking Diet cycle based on Dr. Valter Longo's protocol. Calculates calorie and macro targets for each day adjusted for your body weight and goal.
Calculate your FIRE number - the investment portfolio size needed to retire early. Uses the 4% safe withdrawal rule. Shows years to FIRE, Coast FIRE number, Lean/Fat FIRE variants, and year-by-year savings projections.
Calculate fractions online: add, subtract, multiply, and divide fractions or mixed numbers. Shows step-by-step solution with simplified results and decimal equivalent.
Calculate fuel cost for any trip based on distance, vehicle MPG or L/100km, and gas price. Estimate road trip gas expenses with US and metric unit support.
Generation calculator finds which generation a birth year falls in, from Baby Boomer to Gen Z and Gen Alpha, with the source for every date range. Free, no signup.
Calculate your Glucose Ketone Index (GKI) from blood glucose and ketone readings. See your metabolic zone on the Seyfried scale and get goal-aligned guidance for weight loss, longevity, or therapeutic ketosis.
Project your weight loss timeline on GLP-1 medications (Ozempic, Wegovy, Mounjaro, Zepbound) using averages from published clinical trials. See projected weight at 12, 24, and 52 weeks.
Calculate your semester and cumulative GPA instantly. Supports 4.0 scale, 10.0 CGPA scale, and percentage systems. Add courses, grades, and credits for accurate results.
Calculate GST amounts instantly. Add GST to base price or remove GST from inclusive price. Supports all GST rates with CGST and SGST breakdown.
Calculate your 5 heart rate training zones using Fox, Tanaka, or Karvonen methods. Find your fat burning zone, aerobic zone, and max heart rate for optimized cardio workouts.
Calculate the number of hours and minutes between two times. Perfect for payroll, work hours, shift duration, and time tracking. Supports 12-hour and 24-hour formats with optional break deduction.
Calculate your ideal body weight using four medical formulas - Hamwi, Devine, Robinson, and Miller. Enter your height and gender to see a recommended healthy weight range.
Calculate your dietary inflammation score across 14 food groups using the Dietary Inflammatory Index (DII). See your top pro-inflammatory drivers and get personalised food swap recommendations.
Calculate how inflation has changed the purchasing power of money over time. Enter any amount and see its equivalent value in any year from 1960 to today using US CPI data.
Calculate your HOMA-IR score to assess insulin resistance using fasting blood glucose and insulin values. Includes QUICKI index, five-tier interpretation, and personalised diet and lifestyle recommendations.
Calculate your eating and fasting windows for any intermittent fasting protocol. Supports 16:8, 18:6, 20:4, OMAD, 5:2, and more. See exact eating window times and metabolic stages reached.
Calculate your personalized ketogenic diet macros - fat, protein, and net carbs - based on your body stats and goals. Uses Mifflin-St Jeor or Katch-McArdle formula with ketosis likelihood indicator.
Latency percentile calculator turns raw response time samples into p50, p95, p99 and p99.9 with mean and standard deviation. Runs in your browser, free, no signup.
Calculate your lean body mass (LBM) using the Boer, James, and Hume formulas or exact body fat percentage. Shows fat mass, lean mass, body fat category, and recommended protein intake.
Estimate your life expectancy using 10 evidence-based longevity factors including exercise, diet, smoking, sleep, stress, and social connection. See milestone reachability and lifestyle adjustments.
Lighthouse score calculator using the real log-normal curves and weights. Enter LCP, TBT, CLS, FCP and Speed Index to get your performance score and the biggest points left to win.
LLM token cost calculator estimates API spend per call, day, month and year across OpenAI and Claude models, with prompt caching and batch discounts. Free, no signup.
Calculate Equated Monthly Installments (EMI) for home loans, car loans, personal loans, and education loans. View amortization schedule with principal vs interest breakdown.
Calculate your ideal daily macronutrient targets - protein, carbs, and fat - using the Mifflin-St Jeor equation. Set your goal (cut, bulk, maintain) and diet type to get accurate calorie and macro breakdowns.
Calculate profit margin, markup percentage, and selling prices. Find margin from cost and revenue, convert between margin and markup, and plan pricing strategy.
Calculate the real cost of meetings based on attendees, duration, and average salary. See per-meeting, weekly, monthly, and annual cost breakdowns instantly.
A 5-dimension quiz that scores your ability to switch between burning glucose and fat. Get your metabolic flexibility score and a personalized IF protocol recommendation.
Calculate monthly mortgage payments, total interest, and view a full amortization schedule. Supports fixed-rate loans with customizable down payment, interest rate, and loan terms.
Calculate your net worth by listing assets and liabilities. Instant totals, debt-to-asset ratio, and a copyable summary. Runs fully in your browser - your financial data never leaves your device.
Numerology calculator finds your Life Path, Expression, Soul Urge and Personality numbers from your birth date and name, showing every reduction step. Free, no signup.
Size your off-grid solar system for an RV, van, cabin, or emergency backup. Add your appliances, set backup days, and get exact panel count, battery bank size, and charge controller amperage.
Estimate your one rep max (1RM) using four proven formulas: Epley, Brzycki, Lander, and Lombardi. Generates a complete training weight table from 50-100% of your max for structured strength programming.
Calculate estimated ovulation date, fertile window, implantation window, and next period date from your cycle information.
Calculate percentages easily: find X% of Y, what percent X is of Y, percentage change, and increase/decrease by percentage.
Predict your next period, ovulation day, and fertile window based on your cycle length. Track upcoming periods for 6 months and understand your cycle phases with this free menstrual cycle calculator.
Calculate your estimated due date based on your last menstrual period, conception date, IVF transfer, or ultrasound. Track pregnancy progress with trimester timeline and milestones.
Calculate your optimal daily protein intake based on weight, fitness goal, activity level, and age. Covers goals from RDA minimum to muscle building and athletic performance, with per-meal breakdown.
Calculate, simplify, and convert ratios to decimal and percentage values. Generate equivalent ratios instantly for scaling and proportion problems.
Calculate Flesch Reading Ease and Flesch-Kincaid Grade Level instantly to improve clarity in blogs, docs, and landing page copy.
Calculate how long it takes to read any text at different reading speeds. Paste text or enter word count to get reading and speaking time estimates.
Plan your retirement with this free calculator. Enter your age, savings, monthly contributions, and expected return to see your projected nest egg and monthly income at retirement.
Calculates a week-by-week calorie increase schedule to safely restore your metabolism after dieting or fasting, preventing fat regain while returning to maintenance calories.
Calculate Return on Investment (ROI) instantly. Enter your investment cost and final return to see profit percentage, net gain, and annualized ROI for any investment period.
Calculate running pace, finish time, or distance for any race. Supports 5K, 10K, half marathon, marathon and custom distances. Includes split tables and equivalent race time predictions.
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary. Calculate take-home pay with tax estimates, compare pay rates, and plan your finances.
Convert annual salary to hourly rate or hourly wage to yearly salary. See full pay breakdown by hour, day, week, bi-weekly, monthly, and annually with customizable work hours.
Calculate sales tax with separate state and local rates. Add tax to pre-tax prices or remove tax from tax-inclusive totals with a full breakdown.
Free online scientific calculator with trigonometric, logarithmic, exponential, and statistical functions. Supports degree/radian modes, memory operations, and calculation history.
Calculate returns on Systematic Investment Plan (SIP). See how monthly investments grow over time with expected returns, total invested amount, and wealth gained.
Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Find out when to sleep or wake up to feel fully rested and avoid grogginess.
Calculate the right battery storage size for your solar system or backup power needs. Compare LiFePO4, lithium-ion, AGM, and gel batteries with accurate amp-hour and cost estimates.
Estimate how much electricity your solar panels will produce. Enter panel count, wattage, and your US state to get daily, monthly, and annual kWh production with seasonal breakdowns.
Calculate how many solar panels you need based on your monthly electricity usage and location. Uses real peak sun hours data for all 50 US states to give accurate estimates.
Calculate the return on investment and payback period for a residential solar installation. Factor in the 30% federal tax credit, state incentives, and rising electricity rates to see your true 25-year savings.
Compare the 25-year cost of solar vs staying on the grid. Factor in the 30% federal tax credit, loan payments, and rising utility rates to find your exact breakeven year and total savings.
Compute sample and population standard deviation, variance, mean, and range from comma, space, or line-separated numeric values.
Calculate stock trading profit or loss including brokerage fees and taxes. Find net gain, return percentage, and break-even price for your trades.
Calculate your Total Daily Energy Expenditure (TDEE) and BMR using the Mifflin-St Jeor equation. Get daily calorie targets for weight loss, maintenance, and muscle gain.
Compare two texts for similarity using Levenshtein edit distance. Get a similarity percentage, common substring, and prefix/suffix stats instantly. Free, no signup.
Calculate tips and split bills easily. Choose tip percentage, split between multiple people, and get per-person totals instantly.
Twos complement converter turns signed decimal, hex or binary into 8, 16, 32 or 64-bit two's complement, with the sign bit, exact range checks and overflow warnings.
Compare two products by price per unit and savings percentage to find the best value. Great for grocery shopping, bulk buying, and cost-per-use analysis.
Uptime SLA calculator: turn 99%, 99.9% or 99.999% into allowed downtime per day, week, month and year. Reverse-check a real outage against your error budget. Free, no signup.
Calculate VAT by adding tax to net prices or removing VAT from gross prices with custom rates. Instantly see tax amount, net, and gross totals for any country.
Estimate your visceral fat area (VFA in cm²) using the Samouda anthropometric model - no blood test required. Get your risk level, waist-to-height ratio, and a personalised fat-loss action plan.
Calculate your waist-to-hip ratio (WHR) using WHO standards to assess cardiovascular health risk. Identifies apple vs pear body shape and provides risk categories for men and women.
Calculate how much water you should drink daily based on your body weight, activity level, and climate. Get personalized hydration recommendations in liters, ounces, and glasses.
Calculate exactly how long it will take to reach your goal weight. Uses TDEE and your preferred weekly deficit to project a goal date, daily calorie target, and milestone timeline.
Calculate z-score, percentile, and tail probability from value, mean, and standard deviation for normal distribution analysis.
Zodiac sign calculator finds your sun sign from your birth date with its element, modality, ruling planet, compatible signs and Chinese zodiac animal. Free, no signup.