Bouw Rekenmachines

Calculate Square Footage quickly and accurately. Enter your values — see the result with the formula, worked example, and unit options. Free.

Calculate cubic yards for concrete, soil, gravel, or fill. Enter length, width, and depth — see cubic yards, cubic feet, and bags required. Free.

Calculate cubic feet for any rectangular space. Enter length, width, and height in any units — see cubic feet, cubic inches, and litres. Free.

Concrete volume for slabs and forms. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Calculate gravel for driveways and paths. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Estimate paint needed for rooms. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Perform arithmetic with feet and inches measurements. Enter fractional inches — see result in feet-inches and decimal form. Free.

Calculate how much topsoil you need for any area. Enter length, width, and depth — see cubic yards, cubic feet, and bags at standard sizes. Free.

Calculate the volume of any tank shape: cylindrical, rectangular, or elliptical. Enter dimensions — see volume in litres and gallons. Free.

Calculate road base or gravel needed for a driveway or path. Enter area and depth — see cubic yards, tonnes, and estimated material cost. Free.

Calculate race finish times from your pace. Based on sports science. Instant result with training zone chart and performance guide.

Calculate your golf handicap index from recent scores. Enter your scorecards — see handicap index, course handicap, and playing handicap. Free.

Calculate deadlift one-rep max and strength standards. Enter your best lift weight and reps — see 1RM, strength percentile, and target. Free.

Calculate squat one-rep max and strength standards. Enter weight and reps — see 1RM estimate, Wilks score, and strength classification. Free.

Calculate calories burned running from weight and distance. Enter body weight and km or miles — see calories with pace adjustment. Free.

Calculate calories burned cycling from weight and distance. Enter body weight and duration — see calories with intensity adjustment. Free.

Calculate jump height from flight time or force plate data. Enter your measurement — see vertical leap in cm and inches with power output. Free.

Kubieke yards, zakken nodig voor platen, kolommen en funderingen. Direct materiaalschatting met formule, afvalfactor en stap-voor-stap berekeningsgids.

Calculate total HOA cost over time with annual increase projection. Enter monthly dues and increase rate — see 5, 10, 20-year totals. Free.

How many bricks do you need? Enter wall dimensions and get an instant count — including mortar joints, waste factor, and total cost estimate. Free online tool.

Calculate drywall sheets needed. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Calculate roofing squares and bundles. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Calculate board feet of lumber for any project. Enter length, width, and thickness — see board feet, linear feet, and material cost estimate. Free.

Estimate lumber quantity and cost. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Calculate insulation materials needed. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Calculate load-bearing capacity of structural members. Enter beam dimensions and material — see allowable load and deflection. Free.

Calculate beam deflection and stress under load. Enter span, load, and section properties — see max deflection and bending stress. Free.

Calculate required footing size from soil bearing capacity. Enter column load and soil bearing — see footing area and dimensions. Free.

Calculate roof pitch and rise-over-run. Enter pitch ratio (e.g. 4:12) — see angle in degrees, rafter length multiplier, and slope. Free.

Calculate truss loads and member forces. Enter span, spacing, and loads — see each member force and support reactions. Free.

Find maximum joist span for timber framing. Enter lumber species, size, and spacing — see allowable span and deflection limit. Free.