Calculators

Project your 401(k) balance at retirement, including your employer's matching contributions.

Check whether the difference between two conversion rates is statistically significant, with p-value and uplift.

Turn impressions, clicks, spend and conversions into CTR, CPC, CPM, conversion rate, CPA and ROAS at once.

Calculate age or the exact difference between two dates in years, months, weeks, days, hours, minutes and seconds.

See a full month-by-month (or yearly) loan payoff schedule with principal, interest and balance.

See how much a savings account or CD grows at a given APY over time.

Estimate your car payment from price, down payment, trade-in, sales tax, rate and term.

Estimate blood alcohol content from drinks, weight and time — with clear safety warnings.

Split a restaurant bill with tip and tax evenly, or by what each person ordered.

Calculate your Body Mass Index (BMI) in metric or imperial units and see your weight category.

Estimate your body fat percentage with the U.S. Navy tape-measure method.

Estimate body surface area in m² with the Mosteller formula from height and weight. Education/reference only.

Price a fixed-rate bond from market yield and calculate current yield, yield to maturity sensitivity and duration.

Find how many units you must sell to cover costs, from fixed costs, price and variable cost per unit.

Turn an income statement and balance sheet into a professional liquidity, leverage, profitability and efficiency dashboard.

Build a launch budget, add contingency, model monthly burn and see how long your opening cash will last.

Estimate enterprise and equity value with DCF, market and adjusted-asset methods, explicit reconciliation, scenarios and sensitivity analysis.

Calculate customer acquisition cost, lifetime value, the LTV:CAC ratio and payback period.

Estimate your daily calorie needs (TDEE & BMR) and targets to lose, maintain or gain weight.

Calculate CD, money market and high-yield savings earnings — APY growth broken down by year.

Predict a child's adult height from the parents' heights using the mid-parental method.

Estimate everything you'll pay at closing when buying a home — lender fees, title insurance, transfer taxes by state, prepaids and escrow — plus your total cash to close.

Project inflation-adjusted education costs and the monthly savings needed after grants, existing funds and investment growth.

See how savings or investments grow over time with compound interest and optional monthly contributions.

Live countdown to Christmas, Halloween, Thanksgiving and more — or any date you pick — down to the second.

Set a custom hours/minutes/seconds timer or count down to a date — with a big display you can pop out into a resizable window and scale full-screen.

Estimate creatinine clearance / GFR with the Cockcroft-Gault equation from age, weight and serum creatinine. Education/reference only.

See how long it takes to clear a credit card balance, or the payment needed to pay it off by a date.

Convert between 100 cryptocurrencies and 12 fiat currencies with live, always-current rates.

Convert between 40+ world currencies using live exchange rates that update daily.

Convert between bytes, KB, MB, GB, TB and PB using binary units.

Add or subtract years, months, weeks and days from any date to find a future or past date.

Compare guaranteed interest savings with after-tax, risk-adjusted investment outcomes over the same time horizon.

Calculate your debt-to-income (DTI) ratio from your monthly debt payments and gross income.

Find the sale price and how much you save from an original price and a percentage off.

Work out your home down payment and the loan amount from the price and a percentage down.

How long a file takes to download or upload at any connection speed — with the Mbps vs MB/s confusion sorted out for you.

See what any appliance costs to run per day, month and year — with common presets.

Set a risk-adjusted cash reserve from essential expenses, income stability, dependents, insurance and existing liquid savings.

Compare the after-tax present cost of leasing equipment with financing a purchase, including residual value and opportunity cost.

Wind chill, heat index and dew point — what the temperature really feels like.

Track income and spending like a pro — dashboard with trends and category breakdowns, monthly budgets, multiple accounts, and one-click export to Excel, PDF, CSV or JSON. Private: everything stays in your browser.

Work out what a road trip will cost in gas, per mile and per person.

Calculate your real-world MPG from miles driven and gallons used, with metric equivalents.

Calculate your grade point average from your course grades and credit hours on a 4.0 scale.

Calculate your weighted course grade from assignment scores and their weights.

See how much house you can afford with the 28/36 rule, from income, debts and down payment.

See your ideal body weight by four medical formulas plus the healthy BMI range.

Convert dollars between any two years with real U.S. CPI data, or project inflation forward and backward at a flat rate.

Calculate IV infusion drip rate in gtt/min and pump rate in mL/hr from volume, time and drop factor. Education/reference only.

Convert length and distance — mm, cm, m, km, inches, feet, miles, nautical miles, light years and parsecs.

Field of view for any lens on 30+ sensors — ARRI, RED, Sony, Canon, Blackmagic, full frame, Micro Four Thirds, broadcast and CCTV — plus a reverse mode that finds the focal length you need.

Work out how much life insurance coverage your family actually needs with the DIME method.

Real-time price ticker for the top 100 cryptocurrencies — price, 24h and 7d change, market cap and 7-day charts.

Estimate the monthly payment, total interest and total cost of any loan from the amount, rate and term.

See what you'd actually take home from a jackpot — federal + state taxes, lump sum vs. 30-year annuity, year by year.

Enter two names and get your love compatibility score — just for fun!

Check zodiac love compatibility between two signs or birthdays, with real astrology rules behind the score.

Turn your daily calories into protein, carb and fat gram targets for any diet style.

Calculate gross profit, profit margin and markup from a product's cost and selling price.

Calculate mean arterial pressure from systolic and diastolic blood pressure. Education/reference only.

Weight-based dose calculator: total mg from mg/kg and patient weight, plus volume to draw from a concentration. Education/reference only.

Estimate your monthly mortgage payment from home price, down payment, rate and term — plus taxes, insurance and HOA.

Add up your assets and subtract your debts to calculate your total net worth.

Enter any two of voltage, current, resistance or power — get the other two instantly.

Estimate your 1RM from any set, with training percentages for programming.

Calculate running pace per mile and kilometer, plus speed, from your distance and time.

Work out percentages: X% of Y, X as a percent of Y, and percent change between two numbers.

Calculate nPr, nCr and factorials — ordered and unordered selections from n items.

Convert your dog's or cat's age into human years — size-adjusted, not the old times-7 myth.

Estimate your pregnancy due date from your last period, plus how far along you are.

Compare your current loan to a refinance to see monthly savings and the break-even point.

Compare renting and owning across a chosen horizon with transaction costs, maintenance, taxes, appreciation and investment opportunity cost.

Project your retirement savings from your age, contributions and expected return — plus estimated retirement income.

Stress-test retirement drawdown with inflation, fees, multiple return scenarios and a visible year-by-year balance path.

Calculate return on ad spend, ROI and the break-even ROAS for your profit margin.

Calculate return on investment (ROI), net profit and annualized return (CAGR) from an initial and final value.

Estimate how long it takes an investment to double — or the return needed — using the Rule of 72.

Convert pay between hourly, daily, weekly, monthly and annual based on your hours and weeks worked.

Add sales tax to a price or work backwards to find the pre-tax amount and the tax included.

Find out how much to save each month to reach a savings goal by a target date.

A free online scientific calculator with trig, logs, powers, roots, factorials and constants.

Convert shoe sizes between US, UK and EU for men, women and kids — plus foot length.

Build a broadcast-style run of show — segments, talent, sources, durations and auto-calculated start times — with a live countdown mode and CSV, Excel and PDF export.

Calculate simple interest and the total value from a principal, rate and time period.

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Convert speed — m/s, km/h, mph, feet per second, knots and Mach.

Get mean, median, mode, range, variance and standard deviation from a list of numbers.

A precise online stopwatch with lap times, fastest/slowest highlighting, full-screen mode and a pop-out window that scales to any size.

The right bitrate and encoder settings for Twitch, YouTube or Kick — x264, NVENC, HEVC and AV1 compared, with a quality verdict and suggested OBS settings.

Calculate student loan payments and see how much extra payments save in time and interest.

Estimate your net paycheck after taxes, FICA and pre-tax deductions from your gross salary.

Find your five training heart-rate zones with the Karvonen method.

Convert temperature between Celsius, Fahrenheit, Kelvin and Rankine.

Add or subtract hours, minutes and seconds, or find the duration between two dates and times.

Convert between seconds, minutes, hours, days, weeks, months and years instantly.

Convert a specific date and time from one time zone to another, with daylight saving handled.

See a chosen time across major world time zones at a glance.

Add up weekly work hours from clock-in/out times with breaks, and calculate pay from an hourly rate.

Work out the tip and total for a bill, and split it evenly between any number of people.

Compare salary, bonus, employer benefits, paid time off and risk-adjusted equity on one annual and hourly basis.

Convert length, weight, volume and temperature between common units.

Add or remove VAT at any rate — see the net, VAT amount and gross total instantly.

Recording data rates and card-fill times for ProRes, ProRes RAW, ARRIRAW, REDCODE R3D, Blackmagic BRAW, Sony XAVC & X-OCN, Canon RAW, DNx, H.264/H.265 — any resolution and frame rate.

One flow for a whole shoot — camera + lens + aperture + codec + resolution give you field of view, depth of field, storage, card count and offload time together.

Convert volume — milliliters, liters, cups, teaspoons, tablespoons, fluid ounces, pints, quarts and gallons.

Convert weight and mass — milligrams, grams, kilograms, tonnes, ounces, pounds, stones and tons.

See what $1,000 in Apple, Bitcoin, Tesla or the S&P 500 bought in any year would be worth today — with yearly growth chart and S&P comparison.

Find your astrological sign from your birthday — element, ruling planet, traits and your Chinese zodiac too.