Calculators, with the working shown.

Calculate gross profit, profit margin, and markup from revenue and cost.

Turn a unit cost and markup percentage into a selling price and gross profit.

Estimate the whole units and revenue required to cover fixed and variable costs.

Measure net return and return on investment from gain and investment cost.

Calculate return on ad spend as a multiple and percentage.

Calculate average advertising cost per click from spend and click volume.

Calculate advertising cost for every one thousand impressions.

Calculate click-through rate from clicks and impressions.

Calculate the share of visitors who completed a target action.

Calculate customer churn and retained customers for a reporting period.

Calculate average revenue per active user for a chosen reporting period.

Calculate average customer acquisition cost from sales and marketing spend.

Find a percentage of a non-negative number.

Add a chosen percentage to an original value.

Subtract a chosen percentage from an original value.

Compare two values using their average as the reference.

Find the original value when you know a percentage result.

Convert a part-to-whole ratio into a percentage.

Find the area of a circle from its radius.

Find the circumference of a circle from its radius.

Calculate a rectangle's area and perimeter from length and width.

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

Calculate the hypotenuse and area of a right triangle from its two legs.

Calculate a trapezoid's area from its two parallel bases and height.

Calculate a sphere's surface area and volume from its radius.

Calculate a cylinder's volume from radius and height.

Calculate a cone's volume from radius and perpendicular height.

Calculate a rectangular prism's volume from length, width, and height.

Calculate age on any date using completed calendar years and total days.

Find the signed number of calendar days between two dates.

Move a calendar date forward by a whole number of days.

Move a calendar date backward by a whole number of days.

Count weekdays between two dates, including both endpoints.

Calculate elapsed time between two clock times, including overnight spans.

Estimate concrete volume for a rectangular slab.

Estimate paint needed after deducting openings and adding coats.

Estimate flooring area and boxes for a rectangular room.

Estimate tile pieces and boxes for a rectangular surface.

Estimate drywall sheets for a wall after deducting openings.

Estimate gravel volume with compaction and waste allowances.

Estimate bulk mulch volume and bags for a bed.

Estimate post count and concrete bags for evenly spaced posts.

Estimate interest when the original principal earns a fixed annual rate without compounding.

Estimate how a one-time principal grows when interest is compounded at a selected frequency.

Estimate savings growth from an initial deposit plus regular end-of-month contributions.

Solve for the end-of-month monthly contribution needed to reach a savings target.

Calculate the constant annualized growth rate between a beginning and ending value.

Illustrate the long-term difference between a gross return and a simplified return after annual fees.

Estimate the monthly payment and total interest for a fixed-rate installment loan.

Estimate mortgage principal-and-interest payments for a fixed-rate loan.

Estimate an auto-loan payment from the amount financed or from price, upfront amounts, trade-in, and fees.

Simulate how a recurring extra payment can change payoff time and interest.

View a bounded month-by-month principal, interest, payment, and balance schedule.

Estimate payments based on a longer amortization term and the balance due at a shorter balloon term.

Calculate sale prices, stacked discounts, reverse percentages, bundle deals and sales tax with cent rounding.

Calculate tax and total from a subtotal and tax rate.

Calculate a tip, total, and equal share from a bill and tip percentage.

Convert an hourly wage to annual salary, weekly, biweekly and monthly gross pay, with your schedule and paid leave.

Convert an annual salary to hourly and daily pay, with weekly, biweekly and monthly views and paid leave.

Find the price per square foot from a total price and area.

Calculate a commission amount and sales remaining after commission.

Estimate rent due for a partial billing period.

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

Calculate time per distance unit and average speed from distance and duration.

Compare up to six products by price per kilogram, litre, or piece, with ounces, pounds, and multipacks converted, and the best value marked.

Split a bill evenly or by item with tax and tip, or settle group expenses: who owes whom, with a share link.

Count complete seven-day periods between two dates.

Count complete calendar months between two dates.

Find the signed number of calendar days from today or another date to a target.

Identify the weekday for a calendar date.

Find the ISO 8601 week and ISO year for a date, including year-boundary cases.

Find the calendar quarter containing a date.

Move a date forward by a whole number of seven-day weeks.

Move a date backward by a whole number of seven-day weeks.

Move a date forward by whole calendar months, clamping to the last valid day.

Move a date backward by whole calendar months, clamping to the last valid day.

Move by weekdays while excluding Saturday and Sunday.

Calculate same-day elapsed work hours after subtracting an unpaid break.

Work out your body mass index in metric or US units, with the WHO category, a healthy weight range for your height, and the Asian action points.

Estimate your daily calorie needs from age, sex, height, weight, and activity with the Mifflin-St Jeor equation, with targets to lose, keep, or gain weight.

Estimate a due date from the last period, conception, or an IVF transfer, with weeks pregnant, trimester, and the milestone dates ahead.

Estimate your fertile window and ovulation day for the next six cycles from your last period and cycle length, for trying to conceive.