Guides Hub

Practical how-to articles for measuring, planning, and using the calculators and reference charts on this site. Organized for quick reference in the field and for planning at a desk.

9 guides available

How to Read a Tape Measure (Fractions, Decimals, and Millimeters)

Learn to identify 1/16, 1/32, and 1/64 inch marks on a tape measure and convert readings to decimal inches or millimeters. Written for DIYers and apprentices getting comfortable with Imperial measurement.

Read tape measure guide →

Do You Need 1/16, 1/32, or 1/64 Inch Accuracy?

A practical guide to choosing the right measurement precision for your project. Covers framing, trim, cabinetry, and machining with examples of when each level matters.

Read accuracy guide →

Paint Coverage Per Gallon (Interior, Exterior, Trim)

Coverage rates chart showing how much area one gallon of paint covers by type and surface. Includes interior vs exterior rates, trim calculations, and worked examples.

Read coverage guide →

How Much Paint for a Room? (10x12, Bathroom, Garage & More)

Room-by-room paint estimates with gallon amounts for bedrooms, bathrooms, kitchens, and garages. Includes step-by-step formula and worked examples for any room size.

Read room paint guide →

How Much Gravel Do I Need? Gravel Calculator + Coverage Charts

Contractor-tested formula for calculating gravel in cubic yards and tons. Includes coverage tables, gravel type comparisons, driveway and French drain examples, and a free calculator.

Read gravel guide →

Cubic Yards to Tons Gravel — Conversion Chart & Calculator

Convert cubic yards to tons of gravel using density values for pea gravel, crushed stone, #57 gravel, and river rock. Includes pre-calculated conversion charts in both directions and project-type tonnage estimates.

Read conversion guide →

Gravel Coverage Per Ton — Coverage Chart by Depth & Gravel Type

How much area does 1 ton of gravel cover? Coverage chart for pea gravel, crushed stone, #57 gravel, and river rock at every depth. Includes shortcut formulas, project-type estimates, and a bags-to-tons table.

Read coverage guide →

Paint Calculator by Square Feet — Gallons of Paint Needed

How many gallons of paint do you need? Coverage rates for interior (400 sq ft/gal), exterior (350 sq ft/gal), and primer. Includes room-size chart, whole-house estimates, and step-by-step formula.

Read paint square footage guide →

How to Calculate Paint Quantity — Gallons Needed by Room & Surface

Contractor-tested formula for calculating paint quantity for any room or house. Includes coverage rates for 13 surface types, room-size chart, ceiling calculator, exterior worked example, and primer rules.

Read paint quantity guide →

All Guides

When to Use a How-To Guide vs a Calculator

Calculators give you numbers fast. Enter your dimensions, and the paint calculator tells you how many gallons you need. The gravel calculator converts your area and depth into cubic yards. That speed is the point — you get an answer in seconds without doing the math yourself.

Guides explain the reasoning behind those numbers. They cover how to take accurate measurements, how to account for waste and overage, and how to avoid common mistakes that lead to reorders or leftover material. Reading a guide before using a calculator helps you enter the right inputs and understand what the output actually means for your project.

The same logic applies to reference charts. The fraction to decimal chart gives you instant conversions, but the tape measure guide explains how to read the marks on your tape in the first place. Use both together for the fastest, most accurate workflow.

How to Get the Most from OnSiteCalculator Guides

  • Take measurements first, then open the guide and calculator side by side. Having real numbers in front of you makes the guide examples concrete and the calculator output immediately useful.
  • Bookmark guides you use often. Save them to your phone home screen for job-site reference, or print them for the truck or shop binder.
  • Use guides to train new team members. A consistent method for measuring walls, calculating yardage, or reading a tape reduces mistakes and rework across the crew.
  • Follow internal links between guides, charts, and calculators. Each guide references the specific tools it pairs with. Open the linked calculator or chart as you read to apply the steps in real time.

Looking for Calculators or Charts?

Switch to the calculator hub to estimate material quantities, or visit the chart hub for printable reference tables covering fractions, decimals, millimeters, and lumber dimensions.