Cloture and Poteau Beton Estimateur

Concrete Post Hole Calculator

Calculez le beton pour trous de poteaux de cloture, terrasse, portail et boite aux lettres par diametre, profondeur, gravier, nombre de trous et taille de sac. Obtenez pieds cubes, verges cubes, nombre de sacs de 40/60/80 lb, dechets et cout des materiaux.

Rond Trous

Utilise le diamètre et la profondeur remplie de béton.

Trou Count

Multipliez un trou sur un tronçon de clôture ou terrasse.

Sac Choix

Comparez la pression des sacs de 40, 60 et 80 lb.

Enter Post Hole Details

Enregistrez cette estimation ou telechargez un rapport PDF

Le rapport PDF utilise le resultat calcule actuel. Enregistrez dabord lestimation lorsque vous souhaitez reutiliser les donnees plus tard.

Resultats

Estimation en direct

Volume de beton

0.096 yd³

2.5918 ft³ / 0.0734 m³

Sacs necessaires

5 sacs

Arrondi aux sacs entiers

Cout estime

$25.00

Base sur le prix du sac

Marge

10%

Inclus dans le volume total

Estimation beton en yards

Votre estimation de 0.096 yd3 represente environ 5 sacs apres marge. Utilisez le nombre de yards pour choisir le mode d achat avant de commander.

Estimation favorable aux sacs

Les sacs sont souvent pratiques a cette taille, mais confirmez rendement, temps de melange, trajets magasin et possibilite de placer le beton avant la prise.

Verifier rendement des sacs Comparer la livraison Controler le devis

Controles devis suivants

Utilisez ce volume pour comparer ready-mix livre, beton en sacs, frais de livraison, petite charge et manques du devis avant commande.

Chiffrer le coulage Comparer sacs vs ready-mix Verifier couverture des sacs Verifier les ecarts du devis Comparer les devis entrepreneurs Enregistrer les couts locaux

Reponse rapide

One 12 in diameter post hole that is 36 in deep needs about 2.59 ft3 of concrete with 10% waste. That rounds up to about 5 common 80 lb bags, 6 common 60 lb bags, or 9 common 40 lb bags.

Post-hole scope plan

Turn post-hole bags into an install-ready scope check

Most post-hole calculators stop at cubic feet and bag count. This plan keeps that takeoff, then checks the scope items that change a fence, deck, gate, mailbox, or sign-post job: actual dug diameter, gravel deduction, embed depth, utility marking, frost or permit boundary, bag logistics, and bracing.

Holes

1 at 12 in

Concrete depth

3 ft

Scope score

52/100

Scope check	Why it matters
Actual dug diameter is measured after augering, not assumed from the bit size.	Over-dug holes can change bag count faster than the visible estimate suggests.
Concrete-filled depth is separated from gravel or drainage stone at the bottom.	Gravel at the bottom should not be counted as concrete volume.
Utility marking, property line, frost depth, and permit responsibility are confirmed before digging.	Digging and inspection responsibility must be clear before quote approval.
Posts are braced plumb and hole backfill sequence is defined before concrete sets.	Fast-setting products and regular mixes leave different working windows.
Gravel deduction is intentionally zero or drainage base is not required for this scope.	This check helps turn the calculator result into a comparable quote scope.
Gate, deck, corner, or sign-post loads are reviewed separately from regular fence line posts.	Load-bearing or high-stress posts may need a different approved hole detail.

Deck or gate scope check

Treat this as a quantity anchor and review embed depth, uplift, frost depth, utility marking, permit, and inspection responsibility before work starts.

Primary risk

Structural, frost-depth, gate, deck, or inspection requirements can change the approved hole size.

Bag pressure

Simple bag pickup, about 345 lb dry load

Review post-hole quote Compare bags vs truck

Formule pour trous de poteaux

Un trou rond

Volume per hole = pi x (diameter / 2)^2 x concrete-filled depthVolume per hole = pi x (1.000 / 2)^2 x 3.000

Total de trous

Total before waste = 2.3562 x 1 holesFinal volume = total x (1 + 10%/100)

Sacs

Bags = ceil(final volume / 0.6)

Comptage rapide des sacs pour trous de poteaux

Projet	Taille du trou	Beton avec 10% de gaspillage	Sacs de 80 lb	60 lb bags	40 lb bags
1 hole	8 in x 24 in	0.77 ft3	2	2	3
1 hole	10 in x 30 in	1.50 ft3	3	4	5
1 hole	12 in x 36 in	2.59 ft3	5	6	9
8 holes	10 in x 30 in	11.97 ft3	20	27	40
12 holes	12 in x 36 in	31.15 ft3	52	70	104

These examples use common bag yields and no gravel deduction. Use the calculator above when holes are over-dug, gravel replaces concrete, or the job has mixed post sizes.

Exemples d estimations de trous de poteaux

One 12 in x 36 in post hole

Common fence or gate planning example with 10% waste.

Resultat: 2.5918 ft3 / 0.096 yd3 / 5 sacs

Eight 10 in x 30 in fence holes

Small fence run using 60 lb bags for a carryable option.

Resultat: 11.9991 ft3 / 0.4444 yd3 / 27 sacs

Twelve 12 in x 36 in holes

Larger run where bag count should be planned before buying.

Resultat: 31.1018 ft3 / 1.1519 yd3 / 52 sacs

Avant You Acheter Sacs

Measure the actual dug diameter, not only the planned auger size.
Subtract gravel depth if the bottom of the hole is not filled with concrete.
Separate regular line posts from larger gate, corner, deck, or sign posts.
Check utility marking, frost depth, permit, and structural requirements before digging.

Notes de planification des trous de poteaux

This calculator estimates material quantity only. It does not decide post size, embedment depth, frost depth, wind load, deck code, utility location, or permit requirements.

For the full written guide, see the concrete post hole calculator guide. For fence-specific 4x4, 6x6, corner, and gate-post bag checks, see the fence post concrete calculator guide. If the project is a continuous wall or beam footing, use the concrete footing calculator.

Questions frequentes

How do I calculate concrete for post holes?

Use the round-hole formula: pi times radius squared times concrete-filled depth. Then multiply by the number of holes, add waste, and divide by the bag yield.

How many 80 lb bags for a 12 inch by 36 inch post hole?

One 12 inch diameter by 36 inch deep hole needs about 2.59 cubic feet with 10% waste. With a common 0.60 cubic foot 80 lb bag yield, that rounds up to about 5 bags.

Should I subtract gravel depth from a post hole?

Yes. If gravel sits at the bottom of the hole, enter only the depth that will actually be filled with concrete or subtract the gravel depth before calculating.

Can I use this for fence posts and deck posts?

Use it for material quantity after the approved hole diameter and depth are known. It does not decide frost depth, post size, gate load, deck code, or structural design.

Should I use 40 lb, 60 lb, or 80 lb bags?

Use the bag yield printed on the product. 80 lb bags reduce bag count, while 40 lb and 60 lb bags may be easier to carry for small or scattered holes.

When should I compare ready-mix for post holes?

Compare ready-mix when the job reaches dozens of bags, holes are grouped together, or consistency and placement speed matter. Bags are often practical for scattered fence posts.

Calculatrices associees

Estimateur de béton

Estimateur de projet de béton tout-en-un

Calculatrice cout beton

Estimez les coûts totaux du projet

Calculatrice dalle beton

Calculez le béton pour dalles

Avertissement: Cette calculatrice sert seulement a planifier le materiau beton. Conditions du site, preparation de base, renfort, drainage, joints, precision des coffrages et regles locales peuvent changer les besoins reels. Consultez un entrepreneur ou ingenieur qualifie pour le structurel.