ACI 211.1 Water-Cement Ratio Calculator
Compute the water content needed to hit a target water-cement (w/c) ratio for a concrete mix design.
Imperial / Metric
Materials & Quantities
Concrete, rebar & formwork
The pour, the mix behind it, the steel inside it and the forms around it.
- 64Calculators
- 60Work in imperial
- 59Work in metric
What this covers
Volume for slabs, footings, piers and columns; bag counts and yield; mix design from water-cement ratio through admixture dosage to trial batch adjustment; reinforcement by weight, lap and development length, hooks, chairs and mesh; post-tensioning losses; and formwork pressure for walls, columns and self-compacting mixes.
What decides which one you need
Whether you are buying concrete or designing it. A volume calculator answers a delivery ticket and takes geometry; a mix calculator answers a specification and takes exposure class, strength and aggregate size. Reinforcement splits again by whether you are counting steel to order it or checking a length a code table governs — a lap splice is not an estimating question, and the page cites the clause rather than a rule of thumb.
What this does not cover
The ground the pour bears on, which is excavation and foundations; the kerbs and slabs that form a road, which are paving; and the finish laid on top, which is flooring.
Every calculator in this family
64 calculators
Aggregate Fineness Modulus Calculator (ASTM C136)
Compute an aggregate's fineness modulus from a standard sieve analysis, per ASTM C136.
Concrete Aggregate Moisture Correction Calculator
Correct a concrete mix's batch weights and water for the moisture measured in your sand and stone, so the water-cement ratio stays as designed.
Imperial / Metric
Concrete Air-Entrainment Admixture Dosage Calculator
Compute the total air-entraining admixture volume needed for a concrete batch from its dosage rate.
Metric
Concrete Anchor Proof Load Test Calculator
The load a site proof test on concrete anchors is held at, and how many anchors in a lot to pull, from your specification's multiplier and sample rate.
Imperial / Metric
Circular Pier / Cylinder Concrete Calculator
Estimate the concrete volume needed for round piers, columns, or bollards.
Imperial / Metric
ACI 347 Column Formwork Pressure Calculator
Calculate the maximum lateral pressure on column formwork from ordinary (non-SCC) concrete, using the ACI 347R rate-of-placement formula.
Imperial
Concrete Bag Calculator
Estimate how many bags of pre-mixed concrete you need for fence post footings or small pours.
Imperial / Metric
Concrete Bags to Cubic Yards Calculator
Convert a count of 80 lb concrete bags into cubic yards to compare bagged mix against a ready-mix delivery.
Imperial
Concrete Calculator
Estimate how much concrete a slab needs — in cubic yards or cubic metres, and as a count of premix bags.
Imperial / Metric
Concrete Control Joint Spacing Calculator
Find the recommended maximum spacing between control joints in a concrete slab to control cracking.
Imperial / Metric
Concrete Curing Blanket Calculator
Estimate how many insulated curing blankets you need to protect fresh concrete in cold weather.
Imperial / Metric
Concrete Elastic Modulus Calculator (ACI 318)
Estimate a concrete mix's modulus of elasticity from its unit weight and compressive strength.
Imperial / Metric
Concrete Evaporation Rate Calculator
Estimate concrete surface moisture evaporation rate to check plastic shrinkage cracking risk before a pour.
Metric
Concrete Formwork Calculator
Estimate the edge-form board footage and surface area needed to contain a concrete slab pour.
Imperial / Metric
Concrete Maturity Method Calculator (Nurse-Saul)
Compute a concrete pour's maturity index from its average curing temperature and elapsed time, per ASTM C1074.
Metric
Concrete Mix Design Calculator — ACI 211.1 Absolute Volume Method
Fine aggregate for a concrete mix by ACI 211.1 absolute volume, from the cement, water, coarse aggregate and air chosen, with a check the design fits.
Imperial / Metric
Concrete Mix Ratio Calculator
Break a cement:sand:gravel mix ratio (like 1:2:3) into the actual volumes and cement bags needed for hand-mixed concrete.
Imperial / Metric
Concrete Mix Temperature and Ice Substitution Calculator
Predict ready-mix temperature at the plant from each ingredient's mass and temperature, then find the ice or chilled water that brings it to target.
Imperial / Metric
Concrete MPa to PSI Calculator
Convert a metric concrete strength grade into PSI for US mix specifications and testing.
Imperial / Metric
Concrete PSI to MPa Calculator
Convert concrete compressive strength from PSI to megapascals for metric specifications.
Imperial / Metric
Concrete Pump Line Friction Loss Calculator
Estimate the equivalent pumping distance and pressure loss for a concrete pump line with both horizontal run and vertical lift.
Imperial
Concrete Resurfacer and Patch Calculator
Bags of concrete resurfacer or patching mortar for a worn slab, at the bag's coverage for your area and depth, beside the depths its maker allows.
Imperial / Metric
Concrete Slump Flow Test Calculator (ASTM C1611)
Classify a self-consolidating concrete (SCC) mix's flowability and viscosity from a slump flow test reading.
Imperial / Metric
Concrete Steps Volume Calculator (Solid and Waist-Slab Flights)
The concrete in a flight of steps, solid on the ground or a cast flight on a sloping waist slab, from the riser, going, width and step count, plus waste.
Imperial / Metric
Concrete Unit Weight (Density) Calculator (ASTM C138)
Compute fresh concrete's unit weight from a standard measure-volume test, per ASTM C138.
Imperial / Metric
Concrete Poker Vibrator Insertion Spacing Calculator
Space poker (immersion) vibrator insertions so their radii overlap by your margin, with the insertions each square metre or square foot of lift takes.
Imperial / Metric
Concrete Relative Yield Calculator (ASTM C138)
Check whether a concrete batch actually produced its designed volume, per ASTM C138's relative yield check.
Imperial / Metric
Continuous Footing / Grade Beam Volume Calculator
Estimate the concrete volume needed for a continuous strip footing or grade beam.
Imperial / Metric
Cubic Yards to Concrete Bags Calculator
Convert a required concrete volume into the number of 80 lb bags, for small pours below a delivery minimum.
Imperial
Concrete Curing Compound Coverage Calculator
Estimate the liquid membrane-forming curing compound a concrete slab surface needs, in gallons or litres.
Imperial / Metric
Drilled Pier Concrete Volume Calculator (Straight Shaft / Belled)
Estimate the concrete volume for a drilled shaft foundation pier, with an optional under-ream (bell) at the base.
Imperial / Metric
Epoxy Primer Coverage Over a Profiled Slab Calculator
Derate an epoxy primer's data sheet coverage for the concrete surface profile it goes onto, because that rate was measured on a smooth slab.
Imperial / Metric
Concrete Expansion Joint Filler Calculator
Estimate the sealant or filler volume needed for a concrete expansion joint.
Imperial / Metric
Footing Soil Bearing Pressure Checker
Check whether a footing's applied pressure stays within the soil's allowable bearing capacity.
Imperial / Metric
Formwork Brace & Kicker Force Calculator
The axial load in a wall-form brace (kicker) from the lateral pressure on its tributary strip, and the horizontal and vertical reactions at its anchor.
Imperial / Metric
Concrete Formwork Tie Spacing Calculator
Compute the maximum square-grid spacing for form ties, given the fresh concrete's lateral pressure and the tie's rated capacity.
Imperial / Metric
Fiber-Reinforced Concrete (FRC) Dosage Calculator
Estimate the mass of synthetic (polypropylene) micro-fiber needed for a fiber-reinforced concrete pour.
Imperial / Metric
Insulated Concrete Form (ICF) Block Count Calculator
Calculate how many ICF blocks are needed for a foundation or above-grade ICF wall.
Imperial / Metric
Mass Concrete Thermal Gradient Calculator
Check a mass concrete pour's core-to-surface temperature differential against the standard cracking-risk threshold.
Imperial / Metric
One-Way Slab Minimum Thickness Calculator (ACI 318)
Get the minimum slab thickness ACI 318 allows without an explicit deflection calculation, based on span and support condition.
Imperial / Metric
Pier Adfreeze Uplift Calculator
Check a frost-zone pier: adfreeze bond dragging the shaft up, against the dead load, self-weight and bell holding it down.
Metric
Post Hole Concrete Calculator
Work out the concrete for a set of post holes, allowing for the volume the post itself displaces.
Imperial / Metric
Post-Installed Concrete Anchor Drill Depth Calculator
Turn a required effective embedment into the depth to drill, and check the anchor you have reaches it once the fixture and the nut are allowed for.
Imperial / Metric
Post-Tensioned Anchor Seating Loss Calculator
Estimate the prestress force lost to anchor seating (wedge draw-in) in a short post-tensioned tendon.
Imperial / Metric
Raft Slab Concrete Volume Calculator (Edge Thickenings and Downstands)
The concrete in a raft or ground-bearing slab and the thickenings the plan does not show: edge bands, internal downstands and pads, plus waste.
Imperial / Metric
Reinforced Concrete Beam Moment Capacity Calculator (ACI 318)
Estimate the nominal moment capacity of a singly-reinforced rectangular concrete beam.
Imperial / Metric
Reinforced Concrete Tied Column Axial Capacity Calculator (ACI 318)
Estimate the maximum nominal axial load capacity of a tied (non-spiral) reinforced concrete column.
Imperial / Metric
Rebar Calculator
Estimate the total length of rebar — linear feet or metres — and the number of sticks needed for a rectangular grid inside a concrete slab.
Imperial / Metric
Rebar Chair and Bolster Count Calculator
Count the chairs, bolsters and side-form spacers a reinforcing mat needs so its cover survives a crew walking on it.
Imperial / Metric
Rebar Development Length Calculator (ACI 318)
Estimate the tension development length needed for a rebar bar, using ACI 318's simplified case for adequately spaced/covered bars.
Imperial / Metric
Rebar Lap Splice Length Calculator (ACI 318)
Turn a development length into an ACI 318 lap: Class A or B from the steel ratio and bars spliced, the top-bar and coating factors, and the stagger.
Imperial / Metric
Rebar Standard Hook Development and Cut-Length Calculator
How much embedment a standard 90 or 180 degree hook actually develops, and how much bar the bend and its tail take off the cut list.
Imperial / Metric
Rebar Weight Calculator
Estimate the total weight of rebar needed, for costing or delivery planning, from total length and bar size.
Imperial / Metric
Reverse Concrete Slab Solver
Already have bags of concrete mix on hand? Find the maximum slab area you can pour at a given thickness before running out.
Imperial / Metric
SCC Formwork Lateral Pressure Calculator
Compute the full hydrostatic lateral pressure formwork must resist when pouring self-consolidating concrete (SCC).
Imperial / Metric
Concrete Slab + Rebar Combined Mass Calculator
Compute the total combined mass of a reinforced concrete slab — concrete plus its rebar grid — in one result.
Imperial / Metric
Isolated Spread Footing Sizing Calculator
Size a square isolated column footing from the column load and the site's allowable soil bearing pressure.
Imperial / Metric
Structural Column Pour Calculator
Estimate the concrete volume needed to pour one or more square or rectangular structural columns.
Imperial / Metric
Surface Bonding Cement and Parge Coat Calculator
Bags of surface bonding cement or parge coat for a block or masonry wall, from the area, faces coated and coat thickness, at the bag's printed coverage.
Imperial / Metric
Concrete Trial Batch Yield Adjustment Calculator
Correct a mix design's ingredient quantities after a trial batch's measured yield differs from the design volume (ASTM C138).
Imperial / Metric
ACI 347 Wall Formwork Rate-of-Placement Pressure Calculator
Calculate the maximum lateral pressure on wall formwork from ordinary (non-SCC) concrete, using the ACI 347R rate-of-placement formula.
Imperial
Water-Cement Ratio and Concrete Strength Calculator (Abrams' Law)
The compressive strength a water-cement ratio is likely to give, and the ratio a target strength needs, from Abrams' empirical law.
Imperial / Metric
Welded Wire Mesh Calculator — Reinforcing Mesh Sheets for a Slab
How many sheets of welded wire mesh (steel fabric) a slab takes at your sheet size and the lap on your drawing, and how many of them need cutting.
Imperial / Metric