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砂計算機

配合比から砂の体積と重量を計算します。

はじめに

Sand Calculator — Sand volume & weight from a mix ratio. Enter Total DRY mix volume (m³) - loose cement + sand + gravel before mixing, not finished concrete, Cement ratio, Sand ratio, Gravel ratio to get an instant, accurate result.

計算式

Sand volume = total DRY mix volume × (sand ratio ÷ total ratio parts), for a cement:sand:gravel mix such as 1:2:3 (so 1:2:3 gives 2/6 of the volume as sand). The volume you enter is the loose, dry volume of cement + sand + gravel before mixing, not the volume of finished concrete. Weight assumes about 1,600 kg/m³ for dry loose sand.

ステップごとの説明

  1. Enter the Total DRY mix volume (m³) - loose cement + sand + gravel before mixing, not finished concrete.
  2. Enter the Cement ratio.
  3. Enter the Sand ratio.
  4. Enter the Gravel ratio.
  5. Click Calculate to see your result instantly.

実例

Example: With Total DRY mix volume (m³) - loose cement + sand + gravel before mixing, not finished concrete = 6, Cement ratio = 1, Sand ratio = 2, Gravel ratio = 3, the Sand Calculator gives Sand Volume M3: 2, Sand Weight Kg: 3200, Total Parts: 6.

よくある質問

What mix ratio should I use?
A common general-purpose concrete mix is 1:2:3 (cement:sand:gravel); structural mixes may call for a richer ratio — check project specs.
Is the volume I enter the volume of finished concrete?
No. The ratio applies to the loose, dry materials before mixing. Finished (placed) concrete occupies less volume than its dry ingredients - commonly around 1.5 times less, depending on the materials - so if you only know the finished volume, multiply it by about 1.5 first.
Why 1,600 kg/m³ for sand weight?
It is an assumption, a typical bulk density for dry, loose sand. Actual density varies with moisture content, grading and compaction, so treat the weight as approximate.
What inputs does the Sand Calculator need?
You'll need to provide: Total DRY mix volume (m³) - loose cement + sand + gravel before mixing, not finished concrete, Cement ratio, Sand ratio, Gravel ratio. 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 Sand Calculator?
The Sand Calculator applies the formula exactly as calculated — Sand volume = total DRY mix volume × (sand ratio ÷ total ratio parts), for a cement:sand:gravel mix such as 1:2:3 (so 1:2:3 gives 2/6 of the volume as sand). The volume you enter is the loose, dry volume of cement + sand + gravel before mixing, not the volume of finished concrete. Weight assumes about 1,600 kg/m³ for dry loose sand. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Sand Calculator free to use?
Yes, the Sand Calculator is completely free, requires no signup, and runs instantly in your browser.

砂計算機について

The Sand Calculator uses a real, verifiable formula — Sand volume = total DRY mix volume × (sand ratio ÷ total ratio parts), for a cement:sand:gravel mix such as 1:2:3 (so 1:2:3 gives 2/6 of the volume as sand). The volume you enter is the loose, dry volume of cement + sand + gravel before mixing, not the volume of finished concrete. Weight assumes about 1,600 kg/m³ for dry loose sand. — so results are accurate every time, not an approximation.