Guides
Short, practical guides with the math worked out. Each one links to a free calculator, already filled in for the example.
- How Many Bags of Concrete for a 10×10 Slab?
A 10x10 slab 4 inches thick needs 33.3 cu ft (1.23 cubic yards): 56 bags of 80 lb or 75 bags of 60 lb, before waste. Chart for 3.5 to 6 inch slabs. - How Much Concrete Do I Need for a Fence Post?
How many bags of concrete per fence post: a 10 in hole 36 in deep with a 4x4 post needs about 1.38 cu ft, so 3 bags of 80 lb or 4 bags of 60 lb per hole when rounded up. Calculator and chart. - How Many Bags of Concrete Are in a Cubic Yard?
One cubic yard of concrete is 27 cu ft: about 45 bags of 80 lb, 60 bags of 60 lb or 90 bags of 40 lb at typical yields. Chart from 1/4 to 3 yards plus a converter. - Feet-Inch to Decimal Chart
Printable chart: inches to decimal feet (6 in = 0.5 ft), sixteenths to decimal inches (3/8 = 0.375) and mm, plus a converter for any feet-inch measurement. - Inches to Feet Conversion
Convert inches to feet and inches: divide by 12, the remainder is inches. 66 in = 5' 6", 100 in = 8' 4". Chart of common values and a converter that handles fractions. - How to Calculate the Square Footage of a Room
Measure length and width in feet, multiply, and add closets or alcoves separately. Worked examples with feet and inches, L-shaped rooms and a room-size chart. - Flooring Square Footage with Waste
How to calculate flooring square footage and add waste: measure, add about 10% for straight lay or 15% for diagonal, then divide by sq ft per box and round up. Calculator included. - Square Feet to Square Yards for Carpet
Convert square feet to square yards for carpet by dividing by 9. A 12x12 room is 144 sq ft = 16 sq yd. Chart, price-per-yard comparison and why carpet rolls change the order. - USD to MXN: A Traveler's Guide to Pesos
Convert US dollars to Mexican pesos with today's reference rate, a quick price chart, mental-math shortcuts and tips on ATMs, cards and paying in pesos. - Tipping in Mexico: A Practical Guide
A practical guide to tipping (propina) in Mexico: restaurants, bars, hotels, taxis, gas stations and tours, why to tip in pesos, and a tip calculator with USD conversion.