Calculators

Find out how much sooner you'd pay off your mortgage, and how much interest you'd save, by adding extra principal payments. Compare extra monthly amounts, a one-time lump sum, or switching to biweekly payments against your standard schedule.

Figure out how much lumber you're actually buying. Enter a board's dimensions to get board feet per piece, total board feet for your order, and total cost if you know the price per board foot.

Figure out how much gravel to order for a driveway, path, or other area. Enter the area and depth to get the volume and, since gravel is sold by weight, the tonnage to give your supplier.

Figure out how much mulch to buy for your beds. Enter your bed dimensions and depth to get the volume, the number of standard bags, and an estimated delivery weight for bulk mulch.

Figure out how much paint to buy for a room. Enter your room dimensions (or a wall area you already know), the number of doors and windows, and how many coats you're planning, and get a purchasable amount, not just a raw number.

Estimate your one-rep max (1RM) from a weight and rep count you've actually lifted, using your choice of the Epley, Brzycki, or Lombardi formula. Get training weights at 95%, 90%, 85%, 80%, 75%, and 70% of that estimate.

Find how much protein you actually need each day. Enter your bodyweight, how active you are, and your goal, and get a daily range in grams, not a single number pretending to be more precise than the science actually is, plus a per-meal breakdown so you know how to spread it out.

Estimate your Total Daily Energy Expenditure (TDEE): the calories you burn in an average day, including exercise. Enter your stats below to get a BMR estimate and calorie targets for cutting, maintenance, and bulking.

Find the percentage increase or decrease between two numbers, whatever they represent: a price, a population, a score, a measurement. Enter a starting value and a new value to get the change, clearly labeled as an increase or decrease.

Work out the tip, the total, and what each person owes. Enter the bill, pick a tip percentage, and add how many people are splitting it, if any.