BEng Civil Engineering; 8 years in project management.

Marcus Laurent

Contributor, Construction & Everyday Life

0 calculators 0 articles Member since Jun 2026

About

Marcus focuses on the "practical math" calculators: home projects, construction, fuel, and travel. His goal is simple — give the reader a number they can actually use on site or on the road in under 30 seconds.

Before writing full-time, he spent eight years in infrastructure and residential construction project management.

Areas of expertise

Construction math Home projects Travel planning Fuel economy

Education & credentials

BEng Civil Engineering — Polytechnique Montréal

Construction / Rooms

Stair Calculator

Plan a straight stair run from the floor-to-floor rise: number of steps, individual riser height, and tread depth that f...

basic

10,288 4.1 1 min

Everyday Life

Reading Speed and Time to Finish Book Calculator

Calculates how long it takes to read a book based on reading speed (WPM) and total word count. Average adult reading spe...

basic

13,957 4.5 1 min

Ecology / Energy

Solar Roof Savings Calculator

Estimate the annual generation (kWh) and electricity-bill savings from a rooftop solar PV system, given system size, pea...

basic

10,592 4.5 1 min

Everyday Life

Restaurant Bill Gratuity & Split Calculator

Calculates the tip amount, total bill, and per-person share for a restaurant meal from bill amount, tip percentage, and...

basic

24,470 4.7 1 min

Math / Percentage

Fast Modular Exponentiation Calculator

Calculates a^e mod m using repeated squaring. Essential for RSA, Diffie-Hellman, and primality tests. Works for large va...

basic

7,959 4.1 1 min

Everyday Life

Rope Working Load Calculator

Compute the safe working load limit (WLL) of a rope, sling, or chain from its rated breaking strength and a chosen safet...

basic

1,815 3.9 1 min

Everyday Life

Propane-Tank Burn Time from BTU Rating Calculator

Compute the burn time of a propane tank given its size in gallons and the appliance's BTU/hr rating. 1 US gallon of liqu...

basic

2,205 4.1 1 min

Everyday Life

Household Water Usage from Fixtures Calculator

Estimate a household's daily water usage in gallons from typical fixture flow rates and use frequencies: toilets (1.6 ga...

basic

1,548 5.0 1 min

Health

Creatinine Clearance (Cockcroft–Gault) Calculator

Estimates creatinine clearance using the Cockcroft–Gault equation. Used to adjust drug doses in renal impairment. CrCl <...

basic

20,729 4.9 1 min

Everyday Life

Exact Age from Date of Birth in Years, Months, and Days Calculator

Calculates exact age in years, months, and days given the year of birth and the number of days elapsed since the birthda...

basic

24,101 4.9 1 min

Everyday Life

Heating Degree Days (7-Day) Calculator

Compute heating degree-days (HDD) for a 7-day window by summing max(0, base − daily_average_T) across each day. Used by...

basic

24,594 4.3 1 min

Everyday Life

Gutter Downspout Sizing Calculator

Estimate the number of 2"×3" (handles ~600 ft² roof area) or 3"×4" (~1200 ft²) downspouts needed for a roof, based on th...

basic

12,393 4.0 1 min

Showing 313 to 324 of 359 results

guide Conversions

Unit Conversion Without Typos: A Field Guide

Most unit-conversion mistakes are dumb mistakes — swapped factors, dropped decimals, wrong direction. A short guide to not making them.

Marcus Laurent

Mar 10, 2026 3 min

tutorial Fitness

Running Pace: How to Read Splits Without Getting Lost

Pace, splits, and goal times talk about the same thing from three different angles. A short guide to keeping them straight mid-race.

Marcus Laurent

Jan 30, 2026 3 min

Calcify

Browse categories

Marcus Laurent

Stair Calculator

Reading Speed and Time to Finish Book Calculator

Solar Roof Savings Calculator

Restaurant Bill Gratuity & Split Calculator

Fast Modular Exponentiation Calculator

Rope Working Load Calculator

Propane-Tank Burn Time from BTU Rating Calculator

Household Water Usage from Fixtures Calculator

Creatinine Clearance (Cockcroft–Gault) Calculator

Exact Age from Date of Birth in Years, Months, and Days Calculator

Heating Degree Days (7-Day) Calculator

Gutter Downspout Sizing Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost