406 free calculators

Estimate monthly payments, total interest, and the full cost of a fixed-rate loan.

See the payment when an origination fee is financed into the amount borrowed.

Estimate payments for a loan that starts with an interest-only period.

Estimate the payment after in-school interest is capitalized.

Calculate a recurring payment from the loan amount, rate, and term.

See how the interest rate changes the total cost of borrowing.

See how extra monthly payments shorten a loan and reduce its interest.

Compare the cost of keeping several debts with the cost of one new loan.

Divide profit by revenue for a period.

Divide revenue minus the cost of goods by revenue.

Remove goods, operating costs, interest, and tax, then divide by revenue.

Divide the amount added to cost by the cost.

See what remains of the price after variable cost.

Find how many units cover fixed costs.

Set a price from cost and a target margin.

Mark up a unit cost for the price a retailer pays.

Convert hourly, weekly, monthly, and yearly gross pay.

Multiply an hourly rate by the weeks you work.

Spread an annual salary across the weeks you work.

Divide annual gross pay into one paycheck.

Remove a tax percent and other deductions from one check.

Apply a raise percent to a current salary.

Add a year of paychecks to a bonus.

Multiply hours per day by days and weeks.

See profit after product cost, a percent fee, and shipping.

Take a percent fee off one item price.

Add a referral percent and a flat fee.

Subtract cost, a referral, and a flat fee from the price.

Pay a percent of referred orders.

Take a percent of gross merchandise value.

Multiply weight by a rate and add handling.

Divide cubic centimeters by a divisor.

Add a percentage tip and split the bill.

Share a bill when one person owes an extra amount.

Divide a price by the quantity.

Compare the unit price of two offers.

Count calendar years, months, and days from a birthday.

Count the days until the next birthday.

Measure from one clock time to another.

Find a percent of a number, a ratio, or a percent change.

Add a percent to a starting value.

Remove a percent from a starting value.

Measure the signed change from a starting value to a new value.

Compare two numbers using their average as the base.

Compare a measured value with an accepted value.

Divide the sum of a list by how many numbers it has.

Weight each value before averaging.

Average three scores that count equally.

Find the final exam score a target grade needs.

Average two scores by weight.

Turn correct answers into a percent.

See how many remaining points a target needs.

Average grade points by credit on a 4.0 scale.

Combine two GPAs by their credit hours.

Add an honors or AP bonus, then average by credits.

Count the days from a start date to an end date.

Add calendar days to a date.

Subtract calendar days from a date.

Count both the start date and the end date.

Turn the day gap into decimal weeks.

Count calendar months and leftover days.

Count the days until a target date.

Find the calendar gap between two birthdays.

Convert length between metric and US customary units.

Divide millimeters by 25.4.

Divide centimeters by 2.54.

Multiply inches by 2.54.

Divide meters by 0.3048.

Multiply feet by 0.3048.

Multiply miles by 1.609344.

Divide kilometers by 1.609344.

See an adult body mass index and its screening band.

Estimate body fat with the US Navy circumference method.

Find the Devine dosing weight for a height.

Estimate lean mass with the Boer equation.

Divide waist by height.

Use the Mosteller square-root formula.

Estimate maintenance with revised Harris–Benedict.

Turn a daily gap into days at about 7,700 kcal per kilogram.

Scale an ingredient when the serving count changes.

Divide a finished batch by the number of servings.

Multiply cups by a USDA gram weight.

Divide grams by a USDA cup weight.

Divide the USDA cup weight by 16.

Find the ingredient factor between two pan sizes.

Convert Celsius and Fahrenheit and see the nearest gas mark.

Divide ingredient and packaging cost by the number of servings.

Add waste to a rectangular pour and count packaged bags.

Turn feet and inches of thickness into cubic yards.

Find the cubic yards in a continuous strip.

Use the cylinder volume for round columns.

Count 80- or 60-pound bags from cubic yards.

Count modular bricks with a 3/8 inch joint.

Count 8 by 16 inch nominal concrete blocks.

Add the bed and head joints of modular brick.

Price the energy from watts, hours, and your own rate.

Scale nameplate watts by a duty cycle over a year.

Subtract two meter readings and apply the multiplier.

Price kilowatt-hours you already know.

Multiply voltage by current.

Count panels from daily energy, sun hours, and a loss.

Turn a year of energy into array kilowatts.

Value annual production at a rate you type.

Compare a year of rent with the purchase price.

Divide net operating income by the property value.

Compare cash left after debt with the cash you invested.

Combine the sale, net rent, and costs, then divide by the purchase price.

Subtract expenses and the mortgage from monthly rent.

Turn a percent of income into a home price.

Multiply an assessed value by a tax rate.

Divide a file size by a connection speed.

Reduce the line by protocol overhead, then time the upload.

Find the speed a file needs inside a time limit.

Turn a daily speed habit into gigabytes.

Measure the data one stream uses over the hours you watch.

Measure pixel density from a screen's resolution and size.

Find the diagonal from the width and height.

Convert a millimetre dot pitch into pixels per inch.

Multiply mouse DPI by the sensitivity in one game.

Turn DPI and Source yaw into centimetres per full turn.

Convert a frame rate into milliseconds per frame.

Compare rendered frames with the monitor refresh.

Count horizontal pixels inside one degree of view.

Divide graphics and processor watts by supply efficiency.

Add the download to the time spent writing the same bytes.

Count whole games that fit, and the space left over.

Reduce a width and height to the smallest whole-number ratio.

Split a megapixel count into a width and height.

Divide one edge of pixels by a density.

Build pixel dimensions from a line screen and a quality factor.

Multiply focal length by a sensor crop factor.

Divide a width times a height by one million.

Find the horizontal angle a lens sees on a sensor.

Find the near and far distances that stay acceptably sharp.

Divide pixel dimensions by dots per inch.

Find the dots per inch a file has at a chosen print size.

Turn a print size and a target density into pixels.

Find the millimetres of an ISO A-series sheet.

Snap both edges to the nearest eighth of an inch.

Convert both pixel edges into centimetres.

Add a bleed margin to both edges of a trimmed page.

Divide distance by the fuel used.

Price a trip from economy and the fuel price you pay.

Divide an odometer gap by the gallons added.

Add a reserve percent to the fuel a distance needs.

Blend city and highway miles per gallon.

Add sales tax, then subtract the down payment.

Turn a monthly payment into a vehicle price.

Roll a fee into the amount financed.

Divide distance by speed.

Add planned stops to a drive.

Estimate block time from two coordinates.

Count the tanks a distance needs.

Multiply distance by an allowance you enter.

Add tickets, lodging, and daily spending.

Split lodging, transport, and activities by people.

Add fuel, lodging, and meals.

Bill the larger of scale weight and volume divided by a divisor.

Turn carton centimeters into cubic meters.

Turn carton inches into cubic feet.

Fit cartons on a 48 by 40 inch pallet.

Fit cartons into a 20-foot, 40-foot, or high-cube box.

Divide pounds by cubic feet.

Price the greater weight by the hundredweight.

Multiply mass by acceleration.

Divide meters by seconds.

Divide a change in speed by time.

Take one-half mass times speed squared.

Multiply mass, standard gravity, and height.

Divide joules by seconds.

Divide mass by volume.

Divide moles by liters of solution.