Footing Calculator
Use this free Footing Calculator to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Calculate footing dimensions.
Calculator Inputs
About Footing Size
Use this free Footing Calculator to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
How footing math works in seconds: Enter structural loads plus soil bearing capacity to get required width, depth, and concrete yardage. Results appear at $0 cost in your browser.
Why soil matters for USA builds on 09/22/2026: Clay at 1,500 psf needs triple the width sand at 4,000 allows. Austin builders pouring $300,000 foundations test soils before forming anything. Denver cabins sitting $150,000 frost footings dig below freeze lines regardless.
Deck posts: Chicago contractors setting $90,000 deck packages size post footings per tributary load. Seattle retaining walls holding $400,000 hillsides engineer drainage alongside width.
Underpinning: New York brownstones underpinning $9M renovations sequence sections to avoid settlement. Miami seawalls anchoring $2M shorelines design for scour plus surge.
Yardage orders: Add 10 percent waste to calculated volumes — short loads cost more than leftover mud.
Underpinning: Boston contractors digging $500,000 basement supports sequence pits to avoid settlement cascades. Chicago high-rises founding $90M tower caps test caissons to bedrock on 09/22/2026.
Settlement repair: Miami condos repairing $4M post-surge cracks underpin after dewatering designs finalize. Denver ADUs sitting $250,000 garage conversions verify existing slabs first.
Tilt-up slabs: Phoenix warehouses slabbing $3M tilt panels design thickened edges for panel loads. Order concrete mornings to beat desert heat set times.
Frost law: Footings must bear below local frost lines — shallow footings heave catastrophically in first hard winters.
Inspection rhythm: Call inspections before pours, never after — вскрытие costs more than waiting a day.
Basement supports: Boston contractors digging $500,000 basement underpinnings sequence pits to avoid settlement cascades. Chicago high-rises founding $90M tower caps test caissons to bedrock on 09/22/2026.
Surge repair: Miami condos repairing $4M post-surge cracks underpin only after dewatering designs finalize. Denver ADUs sitting $250,000 garage conversions verify existing slabs first.
Tilt-up timing: Phoenix warehouses slabbing $3M tilt panels design thickened edges for panel loads. Order concrete mornings to beat desert heat set times.
Inspection order: Call inspections before pours, never after — вскрытие costs more than waiting a single day.
Where it is used
Austin builders pour $300,000 foundations, Chicago contractors set $90,000 decks, Miami seawalls anchor $2M shorelines, Denver cabins sit $150,000 frost footings, Seattle retaining walls hold $400,000 hillsides, New York brownstones underpin $9M renovations, Boston contractors dig $500,000 basement underpinnings, Chicago high-rises found $90M caisson caps, Miami condos repair $4M settlement cracks, Denver ADUs sit $250,000 garage conversions, and Phoenix warehouses slab $3M tilt-up panels.
How to use the Footing Size
- Value — enter the value (e.g. 50).
- Total — enter the value (e.g. 200).
- Calculate — press the Calculate button to see the result instantly above.
Formula
Percentage = (Value / Total) * 100
Examples
Deck post
Cabin strip
Retaining run
Frequently Asked Questions
- How do you calculate what percent one number is of another in footing?
- Divide the part value by the total value and multiply by 100. For example, to find what percent 75 is of 200, calculate 75 divided by 200 times 100 which equals 37.5 percent. This formula works for any two numbers and is the foundation of all footing percentage calculations. The Footing Calculator handles this instantly.
- How do I find the original number when I know the percentage for footing?
- Divide the percentage value by the percentage rate expressed as a decimal. For example, if 45 is 30 percent of a number, divide 45 by 0.30 to get 150. This reverse calculation is useful for determining original prices before discounts, finding total footing amounts from partial information, and working backward from known percentages.
- What are the most common uses for percentage calculations in footing?
- Percentages are used for calculating grades, computing discounts and markups, determining tax amounts, analyzing statistics, calculating interest rates, measuring growth or decline, comparing proportions in surveys, and many everyday financial and academic tasks. The Footing Calculator simplifies all of these footing percentage scenarios.
- Can a percentage in footing be greater than 100?
- Yes, percentages can exceed 100. For example, if a company doubles its revenue from $500,000 to $1,000,000, that represents a 100 percent increase. Values greater than 100 percent indicate that the part exceeds the whole, which commonly appears in growth measurements and comparative analyses within footing contexts.
- How do I calculate the percentage increase or decrease for footing?
- Subtract the original value from the new value, divide by the original value, and multiply by 100. A positive result is an increase, while a negative result is a decrease. For example, a price increase from $80 to $100 represents a 25 percent increase. The Footing Calculator handles all footing percentage change calculations automatically.