Popular free calculators

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

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

Convert GPA to an approximate percentage using a simple scale.

Estimate monthly loan payment, total repayment, and interest.

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

Estimate monthly mortgage payment before taxes and insurance.

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

Calculate body mass index from height and weight.

Calculate BMI Prime relative to the upper normal BMI limit.

Calculate exact age from date of birth.

Calculate the average of comma-separated numbers.

Calculate square footage from length and width in feet.

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

Calculate sale price and money saved after a discount.

Add or remove VAT from a price.

Calculate compound interest growth with regular compounding.

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

Add or subtract days from a date.

Count days between two dates.

Estimate due date from last menstrual period.

Calculate days remaining until a due date.

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

Calculate sales tax and total price after tax.

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

Estimate monthly credit card interest from balance and APR.

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

Estimate daily calories using the Mifflin-St Jeor equation.

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

Estimate calories burned while walking.

Estimate calories burned while running.

Calculate weighted grade from score and weight.

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

Calculate a weighted grade from three grade/weight pairs.

Calculate GPA from total grade points and credits.