Concrete Curing Time Calculator

One of the biggest mistakes homeowners make after pouring a new driveway or patio is driving on it too soon. Just because concrete is hard to the touch doesn't mean it is strong enough to support the weight of a heavy vehicle.

By using our concrete curing time calculator, you can map out a safe, scientifically-backed schedule for when you can walk on, park on, and build on top of your new concrete slab.

Concrete does not dryit chemically cures. The water and the Portland cement undergo a chemical reaction called "hydration" that generates heat and slowly bonds the sand and gravel together into artificial rock.

Here is the standard curing timeline that our concrete drying time calculator uses:

• 24 to 48 Hours: The initial set. The concrete is hard enough to carefully walk on without leaving footprints, and you can safely strip the wooden forms away from the edges.
• 7 Days: Partial cure. The slab has reached about 70% of its final strength. It is now safe to drive standard passenger vehicles onto the concrete.
• 28 Days: Full cure. The hydration process is virtually complete. The slab has reached 99% of its maximum compressive strength and can support heavy trucks and equipment.

When a commercial contractor orders concrete, they order a specific PSI (Pounds per Square Inch). For example, they might order a "3,000 PSI Mix."

However, the concrete will not measure 3,000 PSI when it is poured. At the 7 day concrete strength benchmark, the concrete will only measure about 2,100 PSI (70%). It takes an entire month of continuous chemical hydration for the concrete to finally achieve its 28 day concrete strength benchmark of 3,000 PSI.