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

Everyday Life / Travel

Jet Lag Recovery Time Calculator

Estimates jet lag severity and approximate recovery time from time zones crossed and direction of travel (eastward vs we...

basic

4,382 4.7 1 min

Sports

Simplified NBA Player Efficiency Rating Calculator

Compute John Hollinger's Game Score, a quick per-game player efficiency rating used as a proxy for the more complex PER....

basic

6,434 4.7 1 min

Sports

Rowing 500-Metre Split Time from Power Output Calculator

Compute the 500-metre split time (sec/500 m) from power output in watts using the standard rowing ergometer equation: sp...

basic

357 3.9 1 min

Sports

Tennis Service Game Hold Probability Calculator

Given the server's per-point win probability p, compute the probability of holding the game (closed form): G(p) = p⁴(15...

basic

18,849 4.6 1 min

Health

Wells Score for Pulmonary Embolism (PE) Calculator

Calculates the Wells PE score from 7 clinical criteria. Score ≤ 4 = PE unlikely, > 4 = PE likely. Can guide D-dimer and...

basic

13,685 4.4 1 min

Food / Drinks

Espresso Brew Ratio Calculator

Compute the espresso shot yield from a given dry coffee dose and target brew ratio (e.g. 1:2 = double, 1:3 = lungo). Rep...

basic

20,244 4.3 1 min

Food / Party Planning

BBQ Meat Portions Calculator

Estimate the pounds of raw meat to buy for a BBQ given the guest count and the cut. Accounts for typical cooking yield (...

basic

14,501 4.4 1 min

Everyday Life

HVAC Duct Airflow Velocity Sizing Calculator

Calculates HVAC duct airflow (CFM) from rectangular duct width, height, and air velocity, and reports duct cross-section...

basic

900 4.7 1 min

Finance / Investing

Dividend Growth Model (Gordon) Calculator

Calculates the intrinsic stock value using the Gordon Growth Model (Dividend Discount Model) from the next dividend, req...

basic

21,422 4.4 1 min

Physics / Mechanics

Drag Force from Coefficient, Fluid Density, Area, and Velocity Calculator

Calculates drag force F_d = ½ · ρ · v² · C_d · A, where ρ is fluid density, v is velocity, C_d is drag coefficient, and...

basic

22,296 4.2 1 min

Sports

Treadmill Energy Expenditure from Speed and Grade Calculator

Uses the ACSM walking/running MET equation: VO₂ = (0.1×speed + 1.8×speed×grade/100 + 3.5) mL/kg/min. Converts to kcal/mi...

basic

21,242 4.8 1 min

Everyday Life

Compost Greens-and-Browns C:N Ratio Calculator

Compute the C:N ratio of a compost pile from the masses of brown carbon-rich material (CN ≈ 50:1 for dried leaves, straw...

basic

17,157 4.9 1 min

Showing 181 to 192 of 386 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

May 14, 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 24, 2026 3 min

Best Free Calculator

Browse categories

Marcus Laurent

Jet Lag Recovery Time Calculator

Simplified NBA Player Efficiency Rating Calculator

Rowing 500-Metre Split Time from Power Output Calculator

Tennis Service Game Hold Probability Calculator

Wells Score for Pulmonary Embolism (PE) Calculator

Espresso Brew Ratio Calculator

BBQ Meat Portions Calculator

HVAC Duct Airflow Velocity Sizing Calculator

Dividend Growth Model (Gordon) Calculator

Drag Force from Coefficient, Fluid Density, Area, and Velocity Calculator

Treadmill Energy Expenditure from Speed and Grade Calculator

Compost Greens-and-Browns C:N Ratio Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost