DIY

How Many Bags of Concrete Do You Need?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate the number of 60-lb or 80-lb concrete bags for posts, slabs, and small projects.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Bag Concrete vs Ready-Mix
Mixing Tips

Ergiebigkeit

25-kg-Sack: ~0,012 m³. Für 1 m³: ~85 Säcke (~280-340 €). Transportbeton: 80-120 €/m³ (Mindestmenge 3-5 m³). Für kleine Projekte (unter 0,5 m³): Säcke praktischer. Darüber: Transportbeton günstiger und qualitativ besser.

Tipps

Herstellerangaben befolgen. Wasser schrittweise zugeben — zu viel Wasser schwächt den Beton. Konsistenz wie schwerer Teig, nicht Suppe. Für mehr als 20 Säcke: Mischer mieten (30-50 €/Tag).

⚡ CalcWolf Insight

For fence post holes, you can pour dry bag concrete directly into the hole around the post and add water on top — it cures underground. This "dry pour" method is faster than pre-mixing, though pre-mixed is stronger. For structural posts (deck, pergola), always pre-mix.

Frequently asked questions

Wie viele Säcke für Zaunpfosten?▾

Pro Loch 30×30×60 cm: 2-3 Säcke à 25 kg.

Säcke oder Transportbeton?▾

Unter 0,5 m³: Säcke. Darüber: Transportbeton.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →