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ENGINEERING CALCULATORS

Wind load & support moment calculator

Engineering calculators (Beta)

Estimate drag from speed, density, drag coefficient and reference area.

Inputs

Choose units and enter numbers. Full-width digits and fractions such as 1/8 or 1 3/8 are accepted. Changing a unit converts the entered value.

Results

Reference calculation only. Results do not certify suitability for an actual design or its safety.

Diagram

Inputs: select a blue symbol to edit Results: red-orange values and lines

Formula and applicability

q = ρ v² / 2, F = Cd q A; M = Fh

Displayed values are rounded. Diagrams illustrate the calculation conditions. Initial material and fluid properties are examples; replace them with values for the actual material, temperature and conditions.

Reference
Using this information as a reference

Equations assume particular loads, supports and deformation ranges. Check inputs, units and the applicability of each equation. Diagrams explain conditions; they are not manufacturing drawings or proof of safety.

Material values are typical values or reference ranges, not certified product properties or ready-to-use design allowables. They vary with standards, product form, dimensions, temper and temperature. Check the specifications and inspection certificates for the actual product.

Displayed safety factors and checks apply only to the supplied inputs and calculation model. They do not automatically establish the safety of a complete design, including code compliance, service life, fatigue or joints. For actual design, manufacture and use, separately verify applicable regulations and standards, product specifications, and the necessary tests and engineering review.

Calculations do not submit input values to a server. Results are not an automatic code-compliance or safety determination.

この計算で求められること

風速・密度・抗力係数・基準面積から抗力を概算します。

入力・結果・適用条件を確認する

選択した形状・計算方法により、使う項目は変わります。実際の計算は上の図と入力欄で行えます。

主な入力

  • 風速 v (m/s / km/h / mm/s)
  • 空気密度 ρ（入力例） (kg/m³ / g/cm³ / g/L)
  • 抗力係数 Cd（入力例） (—)
  • Cdに対応する基準面積 A (m² / cm² / mm²)
  • 支持点から合力作用線までの垂直距離 h (mm / cm / m)

得られる結果

  • 動圧 q (Pa)
  • 抗力 F (N)
  • Cdを含む面積あたりの力 (Pa)
  • 支持点まわりのモーメント (N·m)
  • 風荷重の換算（kgf。質量kgではありません） (kgf)

計算式の概要

q = ρ v² / 2, F = Cd q A; M = Fh

定常・非圧縮性流れの概算です。Cdと基準面積は同じ定義の組で指定してください。突風・地形・建築基準の設計風荷重を算定するものではありません。

現在選択中の方法には、操作欄の「計算式・適用条件」を使ってください。参考計算であり、設計全体の安全性を保証するものではありません。

関連する計算

What this calculator does

Estimate drag from speed, density, drag coefficient and reference area.

Inputs, outputs and applicability

The selected model determines which of these inputs and outputs apply. Use the working diagram and input panel above to calculate.

Inputs

  • Air speed v (m/s / km/h / mm/s)
  • Air density ρ (example) (kg/m³ / g/cm³ / g/L)
  • Drag coefficient Cd (example) (—)
  • Reference area A matching Cd (m² / cm² / mm²)
  • Perpendicular distance h from support to force line (mm / cm / m)

Calculated results

  • Dynamic pressure q (Pa)
  • Drag force F (N)
  • Force per reference area including Cd (Pa)
  • Moment about the support (N·m)
  • Force equivalent (kgf, not mass kg) (kgf)

Formula overview

q = ρ v² / 2, F = Cd q A; M = Fh

Steady incompressible-flow estimate. Cd and reference area must use matching definitions. This is not a gust, terrain or building-code design wind-load calculation.

The displayed formula and conditions in the working panel apply to the currently selected model. Reference calculation only; it does not certify a complete design.

Related tools

入力する単位を確認・換算する

Check and convert input units

数値の感覚を、図と動きで確かめる

説明用の別モデルです。適用条件を確認してください。数値は自動転記しません。

See the idea in diagrams and motion

A separate explanatory model. Check its assumptions; values are not transferred.