Concrete calculator with London pour forecast
Cubic metres, ready mix loads, and whether this week's weather suits a pour.
Ready to get real prices?
Tell us about your project and up to three London architects will get back to you with quotes. Free, with no obligation.
Enter the length, width and depth of your slab or strip foundation to get the volume in cubic metres, the number of ready mix lorries and a bag count if you are mixing by hand.
Concrete hates frost. The calculator checks the live London forecast for the day you pick and warns you if it is too cold or wet to pour.
Questions people ask
How do I calculate concrete in m³?
Multiply length by width by depth, all in metres. A 6 m by 4 m slab at 150 mm deep is 3.6 m³ before waste.
How much does a ready mix lorry hold?
Most UK ready mix lorries carry up to 6 m³.
Can you pour concrete in cold weather?
Avoid pouring when the temperature is below 2°C or frost is forecast, unless you use heated concrete, accelerators and insulated covers.
Related calculators
Extension cost calculator
What a London extension, loft or basement really costs, with fees, VAT and contingency.
HomeownersArchitect fee calculator
Typical fees by project size, split across the RIBA Plan of Work stages.
PlanningPermitted development checker
Can your rear extension go ahead without planning permission?
PlanningPlanning decision date calculator
When to expect a decision, with your borough's real approval rate.