Cerca and Poste Concreto Estimador

Concrete Post Hole Calculator

Calcula el concreto para agujeros de postes de cerca, terraza, puerta y buzon por diametro, profundidad, permetido de grava, numero de agujeros y tamanio de bolsa. Obten pies cubicos, yardas cubicas, recuento de bolsas de 40/60/80 lb, desperdicio y costo de material.

Redondo Huecos

Usa diámetro y profundidad rellena de concreto.

Hueco Count

Multiplique un agujero a través de un tramo de valla o terraza.

Bolsa Opcion

Compare la presión de bolsas de 40, 60 y 80 lb.

Enter Post Hole Details

Guarda esta estimacion o descarga un reporte PDF

El reporte PDF usa el resultado calculado actual. Guarda la estimacion primero cuando quieras reutilizar los datos despues.

Resultados

Estimacion en vivo

Volumen de concreto

0.096 yd³

2.5918 ft³ / 0.0734 m³

Bolsas necesarias

5 bolsas

Redondeado a bolsas enteras

Costo estimado

$25.00

Basado en el precio por bolsa

Desperdicio

10%

Incluido en el volumen total

Estimacion de concreto en yardas

Tu estimacion de 0.096 yd3 equivale aproximadamente a 5 bolsas despues del desperdicio. Usa el numero de yardas para elegir como comprar antes de ordenar.

Estimacion favorable para bolsas

Las bolsas suelen ser practicas en este tamano, pero confirma rendimiento, tiempo de mezcla, viajes a la tienda y si puedes colocar el vaciado antes del fraguado.

Revisar rendimiento de bolsa Comparar entrega Revisar la cotizacion

Siguientes revisiones de cotizacion

Usa este volumen para comparar ready-mix entregado, concreto en bolsas, entrega, cargos de carga corta y huecos de cotizacion antes de ordenar.

Costear el vaciado Comparar bolsas vs ready-mix Revisar cobertura de bolsas Revisar huecos de cotizacion Comparar ofertas de contratistas Guardar costos locales

Respuesta rapida

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

Formula de huecos para postes

Un hueco redondo

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 huecos

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

Bolsas

Bags = ceil(final volume / 0.6)

Recuento rapido de bolsas para huecos de postes

Proyecto	Tamano del hueco	Concreto con 10% de desperdicio	Bolsas 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.

Ejemplos de estimados de huecos de postes

One 12 in x 36 in post hole

Common fence or gate planning example with 10% waste.

Resultado: 2.5918 ft3 / 0.096 yd3 / 5 bolsas

Eight 10 in x 30 in fence holes

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

Resultado: 11.9991 ft3 / 0.4444 yd3 / 27 bolsas

Twelve 12 in x 36 in holes

Larger run where bag count should be planned before buying.

Resultado: 31.1018 ft3 / 1.1519 yd3 / 52 bolsas

Antes You Comprar Bolsas

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.

Notas de planificacion de huecos de postes

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.

Preguntas frecuentes

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.

Calculadoras relacionadas

Estimador de concreto

Estimador de proyecto de concreto todo en uno

Calculadora de costo de concreto

Estime costos totales del proyecto

Calculadora de losas de concreto

Calcule concreto para losas

Descargo de responsabilidad: Esta calculadora es solo para planificar material de concreto. Condiciones del sitio, preparacion de base, refuerzo, drenaje, juntas, precision de formaletas y normas locales pueden cambiar los requisitos reales. Consulta a un contratista o ingeniero calificado para trabajo estructural.