Calculators
Free calculators for money, time, math and everyday life. Each one shows the formula, worked examples and answers to common questions.
Tip Calculator Work out the tip and split any bill in seconds. Time Card Calculator Add up a week of hours, breaks, overtime, and pay in seconds. Peptide Reconstitution Calculator Turn vial size, water, and target dose into the exact units to draw on an insulin syringe. Tirzepatide Reconstitution Calculator Convert a tirzepatide vial, water, and dose into exact insulin-syringe units. Semaglutide Reconstitution Calculator Convert a semaglutide vial, water, and dose into exact insulin-syringe units. Retatrutide Reconstitution Calculator Convert a retatrutide vial, water, and dose into exact insulin-syringe units. BPC-157 Reconstitution Calculator Convert a BPC-157 vial, water, and microgram dose into exact insulin-syringe units. Percentage Calculator Find a percentage, a share, or a percent change in seconds. GPA Calculator Turn your letter grades and credits into a weighted 4.0 GPA. Age Calculator Find your exact age in years, months, and days from any date of birth. Date Calculator Count the days between dates, or add and subtract from any date. Fraction Calculator Add, subtract, multiply, and divide fractions with reduced results. Pregnancy Due Date Calculator Estimate your due date and gestational age from your last period. Square Footage Calculator Calculate square footage for rooms and areas in feet, inches, yards or meters. Hours Calculator Work out the hours and minutes between a start and end time, minus any break. Concrete Calculator Estimate concrete volume in cubic yards, bag counts and cost for slabs and columns. Ratio Calculator Solve proportions for a missing value and simplify ratios to lowest terms. Percentage Increase Calculator Find the percent increase or decrease between two numbers, or apply one to a value. Discount Calculator Find sale prices and savings from a percent off, or stack discounts and add tax. Margin Calculator Calculate gross margin, markup and selling price from cost, and see margin vs markup. Car Payment Calculator Estimate your monthly car loan payment, total interest and loan cost. Average Calculator Find the mean, median, mode, range, sum and count of any list of numbers. Due Date Calculator Estimate your due date from LMP, conception or IVF, with gestational age and trimester. Ovulation Calculator Estimate your ovulation day and fertile window from your last period and cycle length. Period Calculator Predict your next periods and cycle dates from your last period and cycle length. TDEE Calculator Estimate daily calorie needs (TDEE and BMR) with cutting and bulking targets.