All free calculators

Calculate gross profit and profit margin percentage.

Calculate markup percentage from cost and selling price.

Estimate an hourly freelance rate from income goals and billable hours.

Calculate invoice subtotal, tax, discount, and final total.

Estimate PayPal-style transaction fees using a percentage plus fixed fee.

Estimate card processing fees using a percentage plus fixed fee.

Calculate return on investment percentage.

Calculate advertising cost per thousand impressions.

Calculate advertising cost per click.

Calculate click-through rate from clicks and impressions.

Calculate conversion rate from visitors and conversions.

Calculate how many units you need to sell to break even.

Calculate commission earnings from sales and commission rate.

Calculate revenue growth percentage between two periods.

Calculate CAC from marketing spend and new customers.

Estimate customer lifetime value from average order, purchase frequency, and lifespan.

Calculate customer churn rate for a period.

Estimate the labor cost of a meeting.

Calculate gross profit from revenue and cost of goods sold.

Calculate net profit after expenses.

Calculate operating margin from operating income and revenue.

Calculate average revenue per user.

Calculate how many leads convert into customers.

Calculate email campaign open rate.

Calculate email click rate from clicks and delivered emails.

Calculate return on ad spend.

Calculate profit per item sold.

Calculate inventory turnover from COGS and average inventory.

Calculate output per hour or per worker.

Calculate monthly cash burn.

Estimate how many months cash will last.

Calculate rectangle area from length and width.

Calculate box volume from length, width, and height.

Estimate paint needed from wall area and coverage.

Estimate flooring material needed including waste.

Estimate number of tiles needed for an area.

Estimate concrete volume for a slab.

Calculate room floor area.

Calculate wall area from wall width and height.

Calculate square footage from length and width in feet.

Estimate roofing area and number of roofing squares.

Estimate gravel volume and approximate weight.

Estimate mulch volume in cubic feet and cubic yards.

Estimate stair riser height from total rise and number of steps.

Estimate room cooling BTU from square footage and climate factor.

Convert common length, weight, and temperature units.

Convert meters to feet, inches, kilometers, and miles.

Convert kilograms to pounds, ounces, grams, and stones.

Convert Celsius to Fahrenheit and Kelvin.

Convert kilometers per hour to miles per hour and meters per second.

Calculate exact age from date of birth.

Add or subtract days from a date.

Count days between two dates.

Calculate the duration between two times.

Calculate days remaining until a future date.

Calculate total work hours from start time, end time, and break length.

Calculate the hour difference between two UTC offsets.

Calculate days remaining until a due date.

Calculate weighted grade from score and weight.

Calculate GPA from total grade points and credits.

Convert GPA to an approximate percentage using a simple scale.

Calculate the final exam score needed to reach a target course grade.

Calculate a weighted grade from three grade/weight pairs.

Calculate voltage, current, resistance, and power using Ohm’s law.

Estimate voltage drop from current, wire resistance, and cable length.

Calculate resistance from voltage and current.

Estimate data transfer time from file size and bandwidth.

Calculate data transferred from speed and time.

Estimate trip fuel cost from distance, efficiency, and fuel price.

Estimate electricity cost from watts, hours, and price per kWh.

Calculate pace per kilometer from distance and time.

Estimate download time from file size and internet speed.

Calculate body mass index from height and weight.

Estimate daily calories using the Mifflin-St Jeor equation.

Estimate due date from last menstrual period.

Estimate body fat percentage using a simple BMI-based method.

Estimate ideal body weight using height.

Estimate daily water intake from body weight.

Estimate basal metabolic rate using weight, height, age, and sex.

Estimate total daily energy expenditure from BMR and activity level.

Split daily calories into protein, carbs, and fat targets.

Estimate daily protein target from body weight and grams per kg.

Estimate calories burned using MET, body weight, and duration.

Estimate target heart rate zone from age and intensity.

Estimate wake-up or bedtime options based on 90-minute sleep cycles.

Calculate BMI Prime relative to the upper normal BMI limit.

Calculate waist-to-height ratio.

Estimate one-rep max from lifted weight and reps.

Estimate calories burned while walking.

Estimate calories burned while running.

Estimate training heart-rate zones from age.

Estimate pregnancy week from last menstrual period date.

Estimate ideal body weight using height and sex.

Estimate body fat using neck, waist, height, and sex inputs.

Calculate percentages, parts, totals, increases, and decreases.

Find the percentage increase or decrease from an old value to a new value.

Calculate the average of comma-separated numbers.

Simplify a two-number ratio.

Add, subtract, multiply, or divide two fractions.

Calculate the square root of a number.

Calculate powers, roots, sine, cosine, tangent, and logarithms.

Calculate least common multiple of two numbers.

Calculate greatest common divisor of two numbers.

Check whether a number is prime.

Calculate circle area and circumference from radius.

Calculate triangle area from base and height.

Scale width or height while preserving aspect ratio.

Calculate permutations nPr.

Calculate combinations nCr.

Calculate mean, variance, and standard deviation from comma-separated numbers.

Calculate count, sum, mean, median, min, max, and range.

Find mean, median, and mode from a list of numbers.

Calculate probability from favorable outcomes and total outcomes.

Solve ax² + bx + c = 0 using the quadratic formula.

Find slope from two coordinate points.

Calculate logarithm for a value and base.

Calculate the hypotenuse from two right-triangle legs.

Calculate quotient and remainder for integer division.

Convert a number or decimal into a percent.

Convert a percent into decimal form.

Convert a decimal to an approximate fraction.

Convert a fraction into decimal and percent form.

Round a number to a selected number of decimal places.

Calculate the absolute value of a number.

Calculate n factorial for non-negative integers.

Calculate the remainder after division.

Solve a simple linear equation ax + b = c.

Calculate distance between two coordinate points.

Find the midpoint between two coordinate points.

Calculate sale price and money saved after a discount.

Add or remove VAT from a price.

Calculate sales tax and total price after tax.

Calculate tip amount, total bill, and split per person.

Estimate monthly loan payment, total repayment, and interest.

Estimate monthly mortgage payment before taxes and insurance.

Calculate simple interest over time.

Calculate compound interest growth with regular compounding.

Calculate the monthly saving needed to reach a goal.

Convert annual salary to monthly, weekly, daily, and hourly estimates.

Convert hourly rate and weekly hours into weekly, monthly, and annual income.

Estimate a comfortable monthly rent from income and target rent percentage.

Estimate months to pay off a credit card balance with fixed monthly payments.

Calculate debt-to-income ratio from monthly debt payments and monthly income.

Estimate how much to save for an emergency fund.

Estimate future buying power after inflation.

Convert annual percentage rate into an approximate monthly interest rate.

Estimate net income after a flat tax or deduction percentage.

Estimate monthly car loan payments from vehicle price, down payment, trade-in, rate, and term.

Estimate monthly payment, total interest, and payoff schedule summary for an amortized loan.

Estimate how extra monthly payments can shorten a mortgage payoff timeline.

Estimate future investment value with monthly contributions and annual return.

Estimate retirement savings at retirement from current savings, contributions, return, and years.

Compare rough monthly rent cost against estimated monthly ownership cost.

Estimate time to pay off a debt using fixed monthly payments.

Split monthly income into needs, wants, savings, and remaining money.

Estimate take-home pay after tax, benefits, and other deductions.

Estimate APR from finance charge, loan amount, and loan term.

Calculate monthly payment for a loan amount, annual rate, and term.

Calculate regular pay, overtime pay, and total weekly pay.

Estimate biweekly pay from annual salary or hourly work.

Estimate weekly gross pay from salary or hourly rate.

Convert hourly, daily, weekly, or monthly income into annual income.

Calculate new salary, raise amount, and raise percentage.

Compare salary needs between two cost-of-living levels.

Calculate cashback rewards from spending and reward rate.

Estimate monthly credit card interest from balance and APR.

Estimate a credit card minimum payment using percent plus fees.

Calculate net worth from total assets and liabilities.

Calculate savings rate from income and savings.

Estimate how long it takes money to double at a fixed return rate.

Estimate real return after inflation.

Estimate taxable income after deductions.

Estimate yearly and monthly property tax.

Estimate home purchase closing costs as a percent of price.

Calculate down payment amount and remaining loan amount.

Calculate property or project price per square foot.