Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Engineering
Concrete Mix Design Calculator
Estimates the total cement mass required for a concrete pour based on volume and target strength. Use it when specifying mix proportions for slabs, columns, or foundations to meet structural and durability requirements.
Fill in the required fields to see your result.
Engineering
HVAC Duct Sizing Calculator
Calculate the required diameter or dimensions of HVAC ducts based on air flow rate and design velocity. Use this when designing ventilation systems to balance air delivery with noise and pressure loss constraints.
Fill in the required fields to see your result.
Key differences
| Concrete Mix Design Calculator | HVAC Duct Sizing Calculator | |
|---|---|---|
| Category | Engineering | Engineering |
| Inputs required | 2 | 4 |
| Result | Cement Required (kg) | Duct Dimension (inches) |
| What it does | Estimates the total cement mass required for a concrete pour based on volume and target strength. Use it when specifying mix proportions for slabs, columns, or foundations to meet structural and durability requirements. | Calculate the required diameter or dimensions of HVAC ducts based on air flow rate and design velocity. Use this when designing ventilation systems to balance air delivery with noise and pressure loss constraints. |