Ready Mixed Screed Calculator
Enter total area or width × length, plus screed depth. We’ll estimate volume, weight and bag count. Metres/feet and mm/in supported.
Please enter a valid area (or width & length) and depth greater than zero.
Total Area0.00 m²
Total Volume (incl. waste)0.000 m³
Screed Needed0.00 kg
Bags Required0 bags
Ready Mixed Screed Calculator (UK & USA)
This calculator helps you estimate the volume and weight of ready-mixed screed needed for your flooring projects. Whether you're prepping a domestic subfloor in Derby or a warehouse slab in Dallas, this tool is tailored for accuracy.
Technical Guidance
- 🇬🇧 UK: Traditional sand/cement screed mix ratio is 1:3 to 1:4.5.
- 🇺🇸 USA: Follow ACI 302 standards for topping slabs and floor screeds.
- Recommended depth: 50–75mm for standard internal floors.
Mix Types
| Type | Ratio | Notes |
|---|---|---|
| Traditional Screed | 1:4 | Standard for domestic floors |
| Flowing Screed | Factory-mixed | Ideal for underfloor heating |
| Modified Screed | 1:4 + fibres | Improves strength and bonding |
Density Reference
| Material | Density (kg/m³) | Density (lb/ft³) |
|---|---|---|
| Ready-Mixed Screed | 2100 | 131 |
Pro Tips
- Account for 10% extra material to cover waste and spillage.
- Plan delivery logistics in advance—screed has a limited workable time.
- Ensure the substrate is clean and primed for screed application.
Common Mistakes
- Underestimating screed volume due to uneven subfloor.
- Pouring in cold or hot conditions without proper curing plans.
- Skipping reinforcement when necessary (especially on larger spans).
FAQs
- How much screed do I need for 20m² at 50mm?
Approximately 1m³ or 2.1 tonnes. - Can I walk on the screed the next day?
Usually 24–48 hours for light foot traffic; check with supplier. - What’s best for underfloor heating?
Flowing screeds like anhydrite are preferred due to better coverage.
