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BuildToolHQCalculators → Concrete
Post Hole Concrete Calculator
Tell us your project — we recommend spacing, depth, post size & cure time
ImperialMetric
Step 1 — What are you building?
Step 2 — Your location (frost depth + suggested temp)
Step 3 — Project dimensions
Enter total run length — we'll recommend the rest
Post size
Rule: 3× post width
Min 36" in cold climates
Step 4 — Price per bag (USD)
US avg: ~$6.98
US avg: ~$9.48
US avg: ~$11.98
Step 5 — Cure time estimator
Update with today's actual temp
⚠ Never pour below 32°F / 0°C. Wait for warmer weather.
Results
0.00
cu ft per hole
0.000
total cu yards
Concrete bags — tap to switch
Cost comparison
Gravel base (6" per hole)
0
50lb bags per hole
0
total gravel bags
Includes 10% waste · Store trips = 10 bags per car load
Your hole cross-section — updates live
Buy concrete & gravel
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United States