BuildCalc Blog

How to Calculate Loan Payments: Formula, Worked Example and FAQ

Short answer: a $200,000.00 loan at 6% for 30 years costs $1,199.10 per month, $431,676.00 in total. Formula, worked example, payments table and FAQ inside. Read the guide →

How to Calculate Savings Growth: Compound Interest Formula and Examples

Short answer: $10,000.00 at 5% for 20 years grows to $26,532.98. Formula, worked example, growth table and FAQ inside. Read the guide →

How Much Concrete Do I Need? A Simple Guide With Examples

Short answer: a 10 ft x 10 ft slab, 4 inches thick, needs 1.23 cubic yards, 1.36 with waste. Formula, worked example, slab table and FAQ inside. Read the guide →

How Much Fence Stain Do I Need? A Simple Guide With Examples

Short answer: a 100 ft x 6 ft fence, both sides, 1 coat, needs 8 gallons at 150 sq ft per gallon. Formula, worked example, common size table and FAQ inside. Read the guide →

How Much Paint Do I Need? — Gallons by Room Size

Short answer: a 12 ft x 12 ft room with 8 ft ceilings needs about 2 gallons for one coat and 3 gallons for two coats at 350 sq ft per gallon. Formula, worked example, room-size table and FAQ inside. Read the guide →

How to Use BuildCalc to Plan a Project

Start with a search. Type what you need, for example mortgage, concrete or BMI, and pick the calculator that matches your job. Enter only your own numbers, check the result, and use it to plan your next step. Every calculator shows its formula, so you can check the math yourself.

For a building job, start with the Construction calculators. For money, start with Finance. For daily life, start with Everyday Life. Save this page and check back for new guides.