Paint calculator

From room measurements to boxes you can actually buy

This free flooring calculator adds up to 20 rectangular areas, subtracts excluded space, and applies the allowance you choose. Use it for laminate, vinyl, engineered wood flooring or tile sold in boxes with a stated area coverage. Enter the coverage on the exact package to see the number of whole boxes to buy. Compare two purchases, including accessories and delivery, then carry your selected purchase into a project estimate.

You can use feet and inches, decimal feet, or meters. Enter either a price per box or a price per square foot or square meter. The cost uses the full coverage of the boxes purchased, so it does not overlook material left over after installation.

Worked example: a room and hallway

A 16 × 12 ft room and a 10 × 4 ft hallway total 232 ft². With a 10% allowance, the target is 255.2 ft². Boxes covering 24 ft² require 11 boxes, or 264 ft² purchased. At $37 per box, plus $22 for accessories and $25 delivery, the purchase is $454. These are example inputs, not current retail prices or a recommended allowance.

Does this calculate individual tiles or a laying pattern?

No. It works with flooring and tile sold by package coverage. It does not calculate grout, individual tile counts, cuts, laying patterns, or flooring sold on rolls. Split an irregular floor into nonoverlapping rectangles, and check the package coverage and installation requirements before ordering.

Can I compare different products?

Yes, as alternatives for the same calculated area. Each option has its own coverage, price, accessories, and delivery. The calculator does not assign different flooring products to separate rooms or combine both alternatives into one order.

Is it free, and where are my measurements stored?

The calculator is free and needs no account. Project measurements and prices are processed in your browser. Saving a project is optional and stores a copy in that browser; ordinary requests to load the website still reach its hosting provider.

Read the flooring boxes and cost guide, check the calculation method, or explore all planning guides. For walls and ceilings, use the paint calculator.

Plan paint quantities, then compare what you need to purchase

This free paint calculator works from rectangular room measurements or a net paintable area you already know. Add openings and an optional ceiling in room mode, then enter your coat count, product coverage, and chosen allowance. Compare two can sizes and prices for the same paint and color, using whole cans for each purchase.

Use square feet or square meters and liters, US gallons, or imperial gallons. Selected paint costs can flow into your project estimate alongside flooring and labor. Measurements, prices, and project notes are processed locally in your browser, without an account.

Worked example: walls with two coats

A 16 × 12 ft room with 8 ft walls has 448 ft² of wall surface. Subtract 42 ft² of openings to get 406 ft². Two coats, example coverage of 400 ft² per US gallon, and 5% extra require 2.1315 US gallons. Buying one-gallon cans means three cans. At $42 each plus $12 for accessories, the purchase is $138. Use your actual product label; the example coverage is not universal.

How should I enter an open-plan or L-shaped space?

Measure its real wall surfaces and choose Known paintable area. Do not turn it into imaginary enclosed rooms: the shared edges would add walls that do not exist. Enter the net area after openings; this mode does not subtract them again or add a ceiling.

Can I include different colors, primer, or ceiling paint?

All areas in one calculation share the same paint, color, coverage, and coat count. Plan different products separately. Their costs can be added as custom items in the estimate, but that does not calculate their required quantities.

Does the calculator find the best mix of can sizes?

No. Each alternative buys one can size at a time. It rounds up independently, so you can compare the resulting purchase costs and quantities. A larger can is not automatically the cheaper purchase for your project.

See the paint quantity and can size guide, the formulas and limits, and all planning guides. Planning a floor too? Open the flooring box calculator.

A free project estimate connected to your material purchases

Bring selected flooring and paint purchases into one budget. Add labor hours and internal hourly cost, other expenses, and up to 20 custom quantity × unit-cost items. You can also create a labor-only estimate. Choose markup or margin, review the total before tax, and export a PDF or print without creating an account.

Worked example: why markup and margin differ

A $454 flooring purchase, $138 paint purchase, $280 in labor, and $50 in preparation costs total $922. A 20% markup gives $1,106.40. A 20% margin gives $1,152.50. Markup is a percentage of cost; margin is a percentage of the selling price. This is a calculation example, not a recommended rate.

What is the difference between the two PDFs?

Customer estimate shows the work scope and final price before tax without the generated internal cost or markup/margin breakdown. Internal budget includes that breakdown. Your own descriptions and notes appear as entered, so check both carefully before sharing. Business and customer details, reference, and validity date are optional.

Are these local market prices or tax calculations?

No. OKRoomTools uses the prices, hours, and costs you enter. It does not look up contractor rates, calculate tax, issue invoices, or determine whether a document meets your business requirements. Changing the currency label does not convert money.

Where is my estimate processed?

Calculations, imported project backups, and PDF generation run in your browser. Saving a copy there is optional. Exporting a document does not upload the project to OKRoomTools; loading the website and its resources still creates normal hosting requests. You control any later sharing of the exported file.

Read the project estimate and pricing guide, review the calculation method, or browse all planning guides.