Calculator Categories

Mathematics is the backbone of every science, and these tools remove the arithmetic from your way. Whether you are splitting a bill, simplifying a fraction for homework or checking a square root before you commit to it, the calculators below give you a verified answer and show their working.

Money decisions are easy to get approximately right and expensive to get wrong. These finance calculators give you the real numbers behind a loan, a mortgage, a salary offer or an investment plan — including the amortisation schedule and the total interest you will actually pay.

Health metrics are useful screening tools, not diagnoses. These calculators use the standard published equations so you can estimate body mass index, basal metabolic rate, daily calorie needs and body fat percentage from a handful of measurements.

Grades and GPA rules differ between schools, so the tools here let you choose your own scale, credit weights and rounding behaviour. Use them to work out a current GPA, convert a CGPA to a percentage, or check what a final exam score would need to be.

Physics problems are mostly bookkeeping once you know which equation applies. These calculators implement the standard textbook formulas for kinematics, Newtonian mechanics, electricity and fluid properties, and they show the substitution so you can check your own working.

Stoichiometry problems become much easier when the mole is the pivot point. These tools convert between mass, moles and concentration, parse chemical formulas to get molar masses, and handle the dilution maths behind preparing a solution.

Statistics calculators for descriptive and inferential work: mean, median, mode, standard deviation, z-scores, normal distribution probabilities, confidence intervals and how many samples you need for a survey.

Date maths looks simple until you meet leap years and time zones. These calculators work in whole calendar days, so a “day between dates” is a day between dates — not 23 hours because of daylight saving.

Conversion calculators cover the units you actually run into: metric and imperial lengths, weights, temperatures, areas, volumes, speeds, pressures, energy and data storage. Results are shown in every unit of the dimension at once, so you never have to guess again.

Construction estimating is mostly knowing the coverage rates of each material. These calculators turn a plan measurement into the number of bags, boards, gallons or tonnes you need, with the waste allowance built in.

Some calculations come up constantly and never feel worth opening an app for. These tools cover tipping, splitting a bill, working out fuel costs per mile, scaling a recipe, and comparing unit prices at the supermarket.

Technology calculators cover the numbers that show up in network planning, hardware specs and design work: transfer times, bandwidth requirements, IPv4 subnetting, pixel density and aspect ratios.

Biological systems and field sciences require precise calculations across genetics, ecology, farming, and veterinary health. These tools provide verified formulas to estimate growth rates, field capacities, genetic probabilities, and laboratory dilutions.

Training and performance metrics help athletes and coaches set realistic targets and monitor progress.

Culinary and food science calculators for precise recipe scaling, baking hydration, and kitchen conversions.

Environmental calculators for quantifying ecological impact, greenhouse emissions, and renewable resource generation.

A collection of specialized tools for unique calculations that don’t fit into conventional categories.