Pick a calculator
Choose by task; browse all if you are unsure.
01 · TOOLS
All Calculators
01
Concrete Calculator
Estimate concrete volume, cubic yards and bags from length, width and thickness, with a 5 percent waste allowance.
免费 · Free02
Paint Calculator
Estimate gallons of paint from wall area and the number of coats.
免费 · Free03
Gravel Calculator
Estimate gravel volume, cubic yards and tons from length, width and depth, with a 5 percent waste allowance.
免费 · Free04
Mulch Calculator
Estimate mulch volume, cubic yards and bags from area and depth, with a 5 percent waste allowance.
免费 · Free05
Square Footage Calculator
Calculate square feet and square meters from length and width for rooms, walls and lots.
免费 · Free02 · HOW
How to use
Enter dimensions
Units sit next to each input; results convert automatically.
Read result and assumptions
Waste allowance is included; verify before ordering.
03 · WHY
Why use this site
01
Verifiable math
Every page shows the formula, assumptions and margin. No black box.
02
No signup
Open and calculate. Inputs stay in your browser and are not uploaded.
03
Localized
Chinese and English switch automatically, with units and rules adapted per market.
04 · FAQ
FAQ
How accurate is this?
Estimates follow public formulas with stated assumptions; verify high-stakes decisions on site.
Is it free?
All calculators are free today. Any future Pro tier will be priced on the page.
Do you store my inputs?
No. The math runs locally in your browser and is never submitted.