Tools

Calculators that do the math for you — for the job site, the shop, and everyday life.

🧱 Construction & Home 4

Yards and bags for slabs, footings, walls, columns, and stairs.

How many gallons to cover your walls, by room size and coats.

How many boxes of tile, laminate, or vinyl by room area.

Steps, riser, tread, stringer length, angle, and concrete volume — with a diagram and code check.

Solve for volts, amps, ohms, or watts.

Estimate the cost to run an appliance from its wattage.

Estimate voltage drop by wire gauge, distance, and current.

Convert watts, kilowatts, horsepower, and BTU/hour.

Add, subtract, multiply, and divide feet, inches, and fractions.

Length, weight, volume, and temperature — metric and imperial.

Percent of a number, percent change, and sale discounts.

Tip amount, total, and split per person.

Monthly payment and total interest for a car, home, or personal loan.

Rule of three — find the missing value in a proportion.

Days between two dates, or an exact age from a birthdate.

Convert numbers to Roman numerals and back (1–3999).

All 118 elements, from age 5 to advanced.