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コンクリート階段計算機

積み重ねた打設階段に必要なコンクリート体積を計算します。

はじめに

Concrete Steps Calculator — Concrete volume for stacked poured steps. Enter Number of steps, Step width (m), Step (tread) depth (m), Step (riser) height (m), Waste (%) to get an instant, accurate result.

計算式

Each step is treated as a rectangular slab stacked on the one below it: step volume = width × depth × (step height × step number). Total volume sums all steps, then adds a waste percentage allowance.

ステップごとの説明

  1. Enter the Number of steps.
  2. Enter the Step width (m).
  3. Enter the Step (tread) depth (m).
  4. Enter the Step (riser) height (m).
  5. Enter the Waste (%).
  6. Click Calculate to see your result instantly.

実例

Example: With Number of steps = 3, Step width (m) = 1, Step (tread) depth (m) = 0.3, Step (riser) height (m) = 0.18, Waste (%) = 5, the Concrete Steps Calculator gives Volume M3: 0.3402, Volume Without Waste M3: 0.324, Volume Cubic Yards: 0.445.

よくある質問

Why does each step use a different height in the formula?
Because steps stack, each riser sits on top of the ones below, so step N effectively has N × riser-height of concrete beneath its tread.
Does this account for the stringer or sub-base under the steps?
No, it calculates only the concrete volume of the stacked steps themselves.
What inputs does the Concrete Steps Calculator need?
You'll need to provide: Number of steps, Step width (m), Step (tread) depth (m), Step (riser) height (m), Waste (%). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Concrete Steps Calculator?
The Concrete Steps Calculator applies the formula exactly as calculated — Each step is treated as a rectangular slab stacked on the one below it: step volume = width × depth × (step height × step number). Total volume sums all steps, then adds a waste percentage allowance. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Concrete Steps Calculator free to use?
Yes, the Concrete Steps Calculator is completely free, requires no signup, and runs instantly in your browser.

コンクリート階段計算機について

The Concrete Steps Calculator uses a real, verifiable formula — Each step is treated as a rectangular slab stacked on the one below it: step volume = width × depth × (step height × step number). Total volume sums all steps, then adds a waste percentage allowance. — so results are accurate every time, not an approximation.