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

Physics

Heisenberg Uncertainty Δx·Δp ≥ ℏ/2 Calculator

Calculates the minimum uncertainty in momentum (or position) given the uncertainty in position (or momentum) using Heise...

basic

8,580 4.3 1 min

Everyday Life

Lumber Board Feet from Dimensions Calculator

Compute the board-foot quantity of a piece (or stack of identical pieces) of dimensional lumber from its nominal thickne...

basic

19,461 4.7 1 min

Everyday Life

Electric Vehicle Charging Time and Cost Calculator

Estimate EV charging time and electricity cost from battery size, current and target state-of-charge, charger power (kW)...

basic

11,585 4.3 1 min

Physics

Concrete Cement-Sand-Aggregate Mix Calculator

Calculates the quantities (bags of cement, sand, and aggregate) needed for 1 m³ of concrete from a nominal mix ratio suc...

basic

22,060 4.7 1 min

Health

Daily Caloric Needs from BMR and Activity Level Calculator

Estimates total daily energy expenditure TDEE = BMR × PAL, where PAL is the physical activity level multiplier: sedentar...

basic

14,267 4.9 1 min

Everyday Life

Gable Roof Surface Area Calculator

Compute the total roof surface area of a simple gable (two-pitch) roof from the ridge length, the horizontal half-span (...

basic

2,249 4.9 1 min

Statistics / Descriptive

Coefficient of Variation (CV) Dispersion Calculator

Calculates the coefficient of variation (CV) as a percentage to compare variability between datasets with different mean...

basic

1,826 4.9 1 min

Statistics

Minimum Sample Size for Survey Accuracy Calculator

Calculates the minimum sample size needed for a survey or proportion estimate at a specified confidence level and margin...

basic

7,207 3.9 1 min

Finance / Investing

Jensen's Alpha from CAPM and Actual Return Calculator

Calculates Jensen's alpha = R_portfolio − [R_f + β(R_m − R_f)]. Positive alpha indicates outperformance beyond what CAPM...

basic

21,493 4.1 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

15,256 4.4 1 min

Everyday Life

Window-AC BTU Sizing from Room Area Calculator

Estimate the cooling capacity (BTU/hr) needed for a window-AC unit based on the EnergyStar rule of thumb of ~20 BTU/hr p...

basic

13,733 4.1 1 min

Sports

Lottery Jackpot Expected Value Calculator

Compute the expected value (and the EV-to-cost ratio) of a single lottery ticket given the jackpot, the per-ticket cost,...

basic

13,962 4.1 1 min

Showing 145 to 156 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

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Browse categories

Marcus Laurent

Heisenberg Uncertainty Δx·Δp ≥ ℏ/2 Calculator

Lumber Board Feet from Dimensions Calculator

Electric Vehicle Charging Time and Cost Calculator

Concrete Cement-Sand-Aggregate Mix Calculator

Daily Caloric Needs from BMR and Activity Level Calculator

Gable Roof Surface Area Calculator

Coefficient of Variation (CV) Dispersion Calculator

Minimum Sample Size for Survey Accuracy Calculator

Jensen's Alpha from CAPM and Actual Return Calculator

Simplified NBA Player Efficiency Rating Calculator

Window-AC BTU Sizing from Room Area Calculator

Lottery Jackpot Expected Value Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost