Calcsite

Project retirement savings including employer match.

Convert A1C percentage to estimated average glucose — for general education, not diagnosis.

Add or subtract a number of days from a date.

Calculate exact age in years, months, weeks, days, hours, and minutes — plus a countdown to your next birthday.

Convert a dog's age to human-equivalent years using a logarithmic formula.

See how much of your first payment goes to interest vs. principal.

Calculate the fixed payment from an annuity's present value.

Estimate the effective APR including fees.

Calculate the area of a rectangle from width and height.

Convert between common area units.

Estimate your monthly auto loan payment.

Calculate the average (mean) of a list of numbers.

Rough BAC estimate using the Widmark formula — for education only, not for determining fitness to drive.

Estimate download or transfer time for a file.

Encode text to Base64 or decode Base64 back to text.

Convert a binary number to decimal.

Check which general category a blood pressure reading falls into — not a diagnosis.

Calculate your Body Mass Index, see your category, and find the healthy weight range for your exact height.

Estimate Basal Metabolic Rate using the Mifflin-St Jeor equation.

Estimate body fat percentage for men using waist and neck measurements.

Estimate skeletal frame size from height and wrist circumference.

Estimate body surface area using the Mosteller formula.

Rough body-type classification from frame size — informal, not a clinical measure.

Calculate a bond's current yield from its coupon and price.

Estimate a bra band and cup size from underbust and bust measurements.

Find how many units must be sold to cover fixed costs.

Rough BTU requirement estimate for heating or cooling a room.

Split your monthly income into needs, wants, and savings using the 50/30/20 rule.

Count weekdays (Mon–Fri) between two dates.

Estimate a monthly business loan payment.

Calculate compound annual growth rate.

Estimate daily calorie target for a weight goal.

Estimate calories burned from activity using a MET value.

Find the car price you can afford from a target monthly payment.

Estimate daily carbohydrate target from a calorie goal.

Calculate the maturity value of a certificate of deposit.

Quickly convert a single Celsius temperature to Fahrenheit.

Count characters in a block of text, including spaces.

Very rough percentile placement — always use official CDC/WHO growth charts for real tracking.

Calculate a circle's area from its radius.

Convert a US women's clothing size to the approximate EU size.

Find the probability of getting a specific number of heads in several flips.

Flip one or more coins and count heads.

Project 529-style savings growth for a college fund.

Check WCAG contrast ratio between two hex colors.

Calculate how many ways to choose r items from n, order not mattering.

Calculate growth with monthly compounding interest.

Estimate the likely conception date from the first day of your last period.

Calculate cubic yards of concrete needed for a slab.

Estimate the margin of error around a sample mean.

Measure the linear correlation between two paired values (demo with fixed 3-point set).

Estimate an equivalent salary in a new city given a cost-of-living index difference.

Count down to a specific date in every unit that matters.

Find how many months to pay off a balance at a fixed payment.

Calculate how much of your available credit you're using.

Convert between currencies using fixed demo exchange rates — not live rates.

Convert between bytes, KB, MB, GB, and TB.

Find the exact number of years, months, weeks, days, hours, and minutes between two dates.

Find what day of the week any date falls on.

Find how many days remain until a future date — plus weeks, hours, and minutes.

Find the weighted average interest rate across multiple debts.

Estimate payoff time for the smaller of two debts using extra payments.

Calculate your DTI ratio.

Calculate density from mass and volume.

Calculate annual depreciation expense.

Calculate dew point from temperature and relative humidity.

Find the probability of rolling a specific sum with two six-sided dice.

Roll one or more dice and see the total.

Find the final price after a percentage discount (finance-context version).

Calculate the straight-line distance between two coordinate points.

See how loan terms change with your remaining balance after a down payment.

Estimate the monthly cost of running an appliance.

Find your target emergency fund from monthly expenses.

Convert between common energy units.

Rough federal estate tax estimate using a flat exemption and rate.

Raise a base number to a power.

List all factors (divisors) of a number.

Calculate n! (n factorial).

Estimate daily fat target from a calorie goal.

Estimate the fertile window length before ovulation.

Estimate a monthly payment for an FHA-backed mortgage.

Find the score needed on a final exam to hit a target grade.

Convert a fraction into its decimal equivalent.

Find the hourly rate needed to hit an income target.

Estimate trip fuel cost from distance, fuel economy, and gas price.

Project the future value of a lump sum.

Calculate miles per gallon from distance and fuel used.

Find the greatest common factor of two numbers.

Calculate GDP using the expenditure approach.

Estimate glomerular filtration rate — for general education, not diagnosis.

Estimate a golf handicap index from a single round.

Calculate GPA from two courses' grade points and credit hours.

Calculate a weighted grade from two assignment categories.

Estimate tons of gravel needed for a project.

Rough net pay estimate after a flat deduction rate.

Calculate the remaining amount of a substance after a given time.

Find your cardio training heart rate zone.

Calculate the 'feels like' heat index from temperature and humidity.

Estimate a child's adult height from both parents' heights (mid-parental method).

Estimate a home equity line of credit payment.

Convert a hexadecimal number to decimal.

Convert a hex color code to RGB values.

Estimate a fixed-rate home equity loan payment (lump sum, not a line of credit).

Calculate horsepower from torque and RPM.

Estimate ideal body weight from height using the Devine formula.

Rough estimate using a flat rate — not real bracket data.

See what an amount will be worth after years of inflation.

Project investment growth with monthly contributions.

Calculate the internal rate of return for an initial investment and a single future return.

Find the least common multiple of two numbers.

Calculate lean body mass from weight and body fat percentage.

Check whether a given year is a leap year.

Compare total cost of leasing vs. financing a car over the same term.

Very rough population-average estimate — not a personal prediction.

Solve ax + b = 0 for x.

Calculate your monthly loan payment, total interest, and total cost for any fixed-rate loan.

Calculate the natural logarithm of a number.

Divide two numbers and show the quotient and remainder.

A fun novelty compatibility percentage from two names — for entertainment only.

Split a calorie target into protein, carb, and fat grams.

Calculate profit margin and markup from revenue and cost.

Calculate the selling price after applying a percentage markup to a cost.

Compare estimated flat-rate tax filing jointly vs. as two single filers.

Calculate the determinant of a 2×2 matrix.

Estimate maximum heart rate from age.

Enter a list of numbers to find their mean.

Convert 24-hour military time to standard 12-hour time.

Calculate the molarity of a solution.

Calculate molecular weight from atom counts (H, C, N, O).

Translate text into Morse code.

Estimate your monthly mortgage payment.

Calculate cubic yards of mulch needed for a garden bed.

Project mutual fund growth accounting for an expense ratio.

Randomly pick one name from a list.

Calculate net worth from total assets and liabilities.

Find the nth term and sum of an arithmetic or geometric sequence.

Calculate voltage from current and resistance.

Estimate your one-rep max from a higher-rep set.

Find outliers in a data set using the interquartile range method.

Estimate ovulation day from cycle length.

Calculate the p-value for a given z-score.

Calculate pace in minutes per mile.

Generate a random secure password.

Find how many years it takes to recover an initial investment.

Estimate gross pay per paycheck from annual salary.

Convert an annual salary into weekly, biweekly, semimonthly, and monthly amounts.

Rough estimate of an annual pension benefit from a defined-benefit formula.

Calculate the percentage increase or decrease between two numbers.

Calculate the percentage error between an experimental and actual value.

Find the sale price after applying a percentage discount.

Calculate what X percent of Y is, or find the percent change between two numbers.

Find the value at a given percentile in a data set.

Calculate the perimeter of a rectangle.

Predict your next period start date from your last period and average cycle length.

Calculate how many ordered arrangements of r items from n are possible.

Estimate your monthly personal loan payment.

Estimate a due date from the first day of your last menstrual period.

Estimate recommended weight gain range based on pre-pregnancy BMI category.

Find today's value of a future amount.

Convert between common pressure units.

Check whether a number is prime.

Break a number down into its prime factors.

Calculate the probability of an event from favorable and total outcomes.

Solve for the missing value in a proportion: a/b = c/x.

Estimate daily protein target for active individuals.

Find the hypotenuse of a right triangle from its two legs.

Solve ax² + bx + c = 0 for real roots.

Generate a random whole number in a range.

Find the range (max − min) of a data set.

Simplify a ratio to its lowest terms.

Estimate your new payment after refinancing.

Fit a line's slope through a fixed 3-point demo data set given your third point.

Compare monthly rent against an estimated mortgage payment.

Calculate the capitalization rate for a rental property investment.

Calculate resistance from two significant digits and a multiplier band.

Project retirement savings from current balance and contributions.

Calculate your Required Minimum Distribution from a retirement account.

Calculate return on investment as a percentage.

Convert a number to Roman numerals.

Convert roof area into roofing squares.

Project Roth IRA growth from contributions — grows tax-free.

Round a number to a chosen number of decimal places.

Convert an annual salary to an hourly rate.

Calculate total pay from a base salary plus commission.

Calculate sales tax and total price.

Determine the sample size needed for a target margin of error.

Find the monthly savings needed to reach a target amount.

Compute a power or logarithm.

Convert a decimal number into scientific notation.

Convert a US men's shoe size to foot length in centimeters.

Calculate interest that doesn't compound.

Find a wake time that aligns with 90-minute sleep cycles.

Find the slope of a line through two points.

Very rough monthly benefit estimate — not a substitute for your actual SSA statement.

Convert between common speed units.

Calculate the square footage of a rectangular space.

Find the square root of a number.

Calculate riser height for a staircase.

Calculate the sample standard deviation of a data set.

Convert step count to approximate distance.

Estimate a monthly student loan payment.

Find usable host count from a CIDR prefix.

Calculate swim pace per 100 meters.

Estimate Total Daily Energy Expenditure from BMR and activity level.

Convert between Celsius, Fahrenheit, and Kelvin.

Calculate how many tiles you need including waste allowance.

Sum five daily hour totals into a weekly total.

Calculate the duration between two times on the same day.

Convert between seconds, minutes, hours, days, and weeks.

Convert a time from one UTC offset to another.

Split a bill and calculate tip per person.

Calculate overall tire diameter from a standard tire size code.

Project traditional IRA growth — contributions may be tax-deductible now, taxed on withdrawal.

Calculate a triangle's area from its base and height.

Find an angle from opposite and adjacent side lengths.

Calculate words per minute from a word count and time.

Convert a length to every common unit at once — mm, cm, m, km, inches, feet, yards, and miles.

Convert between a Unix timestamp and a calendar date.

Encode text for safe use in a URL, or decode a URL-encoded string.

Estimate a monthly payment for a VA-backed mortgage.

Calculate the sample variance of a data set.

Calculate VAT amount from a price, either added on or already included.

Find the magnitude of a 2D vector.

Rough VO2 max estimate from a walking test.

Estimate voltage drop over a wire run.

Calculate the volume of a rectangular box.

Convert between metric and US customary volume units.

Calculate waist-to-hip ratio, a marker of fat distribution.

Estimate daily water intake from body weight.

Find the ISO week number for any date.

Convert between metric and imperial weight units.

Calculate a weighted average from two value/weight pairs.

Calculate wind chill temperature from air temperature and wind speed.

Count words in a block of text.

Calculate hours worked from clock-in and clock-out times.

Calculate how many standard deviations a value is from the mean.