Calculators— Guides & Articles

• 2x4 Cut List Optimizer: Plan Boards, Track Kerf & Waste

  Published 2026-08-04

  Use a 2x4 cut list optimizer to assign parts to standard 2x4 stock with explicit kerf, kerf-aware totals, and a deterministic First Fit Decreasing plan.

  

• How to Calculate Curtain Fabric in Meters: Formula

  Published 2026-08-04

  Curtain fabric in meters follows a simple formula: track × fullness ÷ fabric width, plus a hem allowance. Step-by-step worked example with real numbers.

  

• How to Calculate Cube Volume for Shipping Costs

  Published 2026-08-04

  Cube volume for shipping is V = s³ from one side length. Use the Cube Volume Calculator to size boxes, plan loads, and check carrier volumetric weight.

  

• How to Calculate Frustum Cone Volume Step by Step

  Published 2026-08-03

  Calculate the volume of a frustum cone using V = (1/3)πh(R² + Rr + r²). Step-by-step method plus the full cone calculator for the subtraction technique.

  

• How to Calculate Cone Curved Surface Area Step by Step

  Published 2026-08-03

  Find the curved surface area of a right circular cone with the πrl formula. Includes the slant height step, a worked example, and a free instant calculator.

  

• How to Change Clothing Size on Vinted

  Published 2026-08-03

  Vinted listings show the seller's country size, so US, UK and EU numbers can all appear. Convert any Vinted size across all three systems in a click.

  

• How to Calculate the Circumference of a Cylinder

  Published 2026-08-03

  The circumference of a cylinder is the circumference of its circular face. Use C = 2πr or C = πd — get the answer in seconds with our free tool.

  

• How to Calculate Circle Area for a Concrete Pour

  Published 2026-08-03

  Calculate the circle area for a concrete pour with A = πr². Get exact square footage from radius or diameter and size your concrete order.

  

• Chinese Gender Calendar: What It Is and How to Read It

  Published 2026-08-03

  The Chinese gender calendar is a 28-by-12 folk chart that reads boy or girl from lunar age and conception month. Use it as a fun guess.

  

• Cat Years to Human Years: The Vet-Approved Curve

  Published 2026-08-02

  Calculate cat age in human years using the vet-approved 15-9-4 curve, not the old times-seven rule. Free tool with life stage.