Concrete Calculator UK — Ballast, Cement & Materials Estimator

Free UK Concrete Calculator — Ballast, Cement & Materials Estimator

Whether you're laying a path, pouring a shed base, or setting foundations, this free calculator works out exactly how much concrete you need and breaks it down into real materials you can order from your local builders merchant. Enter your dimensions, choose your mix ratio, and get instant quantities for ballast tonbags, 20kg bags, and 25kg cement bags — including estimated costs at current UK market rates.

Supports metric (metres, millimetres) and imperial (feet, inches) measurements. Adjustable waste allowance. VAT toggle for trade and retail pricing. All mixes shown as cement:ballast ratios as sold by UK builders merchants.

Materials Required

⚠ Quantities include a 5% waste allowance. Always order a little extra for small top-ups.

      ℹ 1 tonbag (~850kg) = 43 × 20kg bags
    

Estimated Cost

PRICES — VAT @ 20%

Total Materials Est.

£0

inc. VAT

Low estimate £0 High estimate £0

// Prices based on typical UK builders merchant rates (March 2026):
Cement £6.50–£8.00 per 25kg bag · Ballast tonbag £45–£65 · Ballast 20kg bags £3.00–£4.50 · all inc. VAT @ 20%.
Prices vary by region, supplier, and trade account. Always get a quote before ordering.

        🚚 Delivery costs are not included. Delivery charges vary depending on your location, order quantity, and supplier — typically £15–£35 for small orders, and free or included above merchant minimum thresholds. Always confirm delivery costs when requesting a quote.
      

// These quantities are estimates based on standard mix ratios and typical material densities. Actual requirements may vary based on aggregate grading, moisture content, and site conditions. Always consult a structural engineer for load-bearing or foundation work.

Find Local Suppliers

        Enter your postcode to find builders merchants who deliver tonbags and cement pallets to your area.
      

Frequently Asked Questions