About CalcMaster

Our Mission

CalcMaster exists to make calculations accessible, transparent, and free. Every calculator on this site shows the exact formula used to produce the result. You do not need to sign up, pay, or provide personal information. Enter your numbers, get your answer, and see the math behind it.

What We Offer

CalcMaster provides 1000+ free online calculators organized into ten categories:

  • Construction — Studs, concrete, drywall, board feet, floor joists, fence posts, roof pitch, and rafters
  • Roofing — Shingles, pitch multiplier, bundles, and roofing materials
  • Gravel & Landscaping — Gravel, sand, river rock, limestone, and rip rap
  • Engineering — Torque, stress, beam, Young's modulus, friction loss, and head loss
  • Electrical — KVA, watt hours, battery, and HP to amps
  • Finance — Markup, margin, ROAS, payback period, and Sharpe ratio
  • Health — BMI, calorie burn, heart rate, and dosage
  • Animal & Pregnancy — Dog, cat, puppy, and sheep gestation calculators
  • Date Calculators — 30, 60, 90, 100 days from today, and graduation year
  • Conversions — Inches to fraction, cubic feet to pounds, MPG to L/100KM, and metric to imperial

How Our Calculators Work

Every CalcMaster calculator follows the same principle: use industry-standard formulas, show the exact math, and deliver instant results. Calculators run entirely in your browser. No data is sent to any server. Your inputs stay on your device.

Accuracy & Methodology

We use formulas sourced from industry standards, building codes (IRC, IBC), scientific literature, and established financial principles. Every calculator page includes the formula, step-by-step instructions, and reference tables. For detailed methodology, see our Calculator Methodology page.

Editorial Standards

CalcMaster content is written by subject matter specialists in construction, engineering, finance, and health. Every calculator page includes sourced formulas, industry-standard values, and practical application guidance. Read our Editorial Policy for full details.

Contact

Questions, feedback, or calculator requests? Visit our Contact Page.