Simple, mobile-friendly calculators for construction, pay estimates, unit conversions, and everyday jobsite math. Get instant answers without an account.
QuickJobTools is a free collection of online calculators for construction projects, pay estimates, and unit conversions. Each tool focuses on one job, such as figuring out how many concrete bags a slab needs, how many tiles to buy for a bathroom, or what a week of overtime is worth, and returns an answer as soon as the numbers are entered. There is no account to create, no login, and nothing to install; the calculators open in any modern browser on a phone, tablet, or computer.
The site is built for tradespeople, contractors, DIY homeowners, project managers, and hourly workers who need quick, practical math on a jobsite, at the supply yard, or while checking a paycheck. The construction calculators cover square footage, concrete volume and bags, gravel, mulch, drywall, tile, paint coverage, roof pitch, stair risers, and fence posts. The work and pay calculators handle overtime, time and a half, hourly to weekly pay, weekly to annual pay, and 1099 contractor rates. The unit converters switch between common measurements like feet and inches, cubic yards and cubic feet, pounds and kilograms, gallons and liters, Celsius and Fahrenheit, PSI and bar, and miles and kilometers. Each page explains the formula behind the result and includes worked examples, so the numbers can be checked by hand.
To get started, browse the three categories below or type a word like concrete or overtime into the search box to filter the list. Open a calculator, enter your measurements or pay details, and the result updates right away. All results are estimates meant for planning: confirm material quantities with your supplier and product labels, follow local building codes, and check pay figures against your employer's payroll records.
Estimate bags of concrete for slabs, footings, and pads.
PopularCalculate area for rooms, floors, slabs, and project surfaces.
Calculate cubic yards or feet of concrete needed.
Estimate gravel volume for driveways and landscaping projects.
Estimate sheets of drywall needed for walls and ceilings.
Estimate tile quantity for floor or wall installations.
Calculate pitch ratio and angle from rise and run.
Estimate riser count and rise height for any staircase.
Estimate gallons of paint for any surface area.
Estimate mulch needed by garden area and depth.
Estimate posts and sections for fence projects.
Calculate regular pay, overtime pay, and total weekly gross.
Convert your hourly rate to weekly gross pay.
Calculate your 1.5× overtime rate and total pay.
Convert weekly pay to annual gross income.
Estimate the hourly rate a contractor needs to charge.
Convert feet to inches instantly.
Convert inches to feet instantly.
Convert yd³ to ft³ for concrete and material orders.
Convert lb to kg instantly.
Convert US gallons to liters instantly.
Convert Celsius to Fahrenheit and back.
Convert pressure between PSI and bar.
Convert miles to km instantly.
Built for tradespeople, contractors, homeowners, and project managers who need fast answers on the jobsite or at the hardware store. Enter your measurements, get your estimate immediately — no app install, no sign-up, no loading screens.
Material calculators include waste factors where they matter, plus real-world examples and plain-English explanations of every formula. Works on iPhone, iPad, and desktop, even with a poor cell signal.
Yes. Every calculator and converter on the site is free to use as often as you like, with no account, subscription, or sign-up. The site is supported by advertising.
No. The calculators run in your web browser on a phone, tablet, or computer, so there is nothing to install and no login.
No. Calculations run locally in your browser, and the calculators do not send or save your inputs. Third-party advertising and analytics services on the site may use cookies, as described in the privacy policy.
The math follows standard formulas, such as length × width for square footage and 27 cubic feet per cubic yard, but results are only as accurate as your measurements. Treat construction results as planning estimates and add a waste allowance where your project needs one.
Some do. The tile calculator lets you choose a 5%, 10%, or 15% waste factor; for tools that return an exact volume or count, such as the mulch and fence calculators, add extra yourself, commonly about 10%.
No. The overtime, hourly, weekly, and annual pay calculators show gross pay before taxes and deductions. Overtime defaults to 1.5× the regular rate, the federal standard for non-exempt employees working over 40 hours in a workweek.
The construction calculators use US units such as feet, inches, square feet, and cubic yards. If you have metric measurements, use the unit converters, such as inches to centimeters or gallons to liters, before or after calculating.
Use them as a starting point, not a final answer. Check material orders with your supplier, building requirements with your local building department, and pay questions with your employer or a qualified professional.