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

Sports

Plank Hold Percentile Calculator

Compute an approximate percentile rank for the maximum forearm-plank hold time, using a normal model fit to common adult...

basic

1,723 4.9 1 min

Finance / Investing

NPV from Multiple Cash Flows and Discount Rate Calculator

Calculates NPV = Σ CF_t/(1+r)^t − Initial investment for up to 5 periods. Positive NPV indicates value creation.

basic

16,695 3.9 1 min

Everyday Life

Two-Stroke Engine Fuel-Mix Calculator

Compute the ounces of two-stroke oil to add per US gallon of gasoline for a chosen fuel-to-oil mix ratio (e.g. 50:1, 40:...

basic

11,251 4.1 1 min

Sports

Basketball Hollinger Game Score Calculator

Compute John Hollinger's Game Score — a quick single-number player performance metric: PTS + 0.4·FGM − 0.7·FGA − 0.4·(FT...

basic

4,418 4.4 1 min

Sports

Baseball Batting Average & On-Base Calculator

Compute a batter's batting average (BA = H/AB) and on-base percentage (OBP = (H + BB + HBP) / (AB + BB + HBP + SF)) from...

basic

22,645 4.2 1 min

Finance / Investing

Sharpe Ratio Risk-Adjusted Return Calculator

Calculates the Sharpe ratio of a portfolio from its return, risk-free rate, and standard deviation of returns.

basic

10,340 4.0 1 min

Physics

Snell's Law Refraction & Critical Angle Calculator

Calculates the refracted angle using Snell's Law and the critical angle for total internal reflection from the two refra...

basic

21,442 4.2 1 min

Everyday Life

Plant Spacing and Quantity Calculator

Compute the number of plants that fit in a rectangular bed at a given on-centre spacing. Square grid: rows = floor(width...

basic

1,173 4.9 1 min

Sports

VDOT Estimator

Estimate your Daniels VDOT (relative running economy / fitness number) from a recent race time and distance, using Danie...

basic

23,931 4.6 1 min

Construction / Materials

Paint Coverage Calculator

Estimate how much paint you need to cover the walls of a room based on area, paint coverage rate, and number of coats.

basic

11,134 4.0 1 min

Everyday Life

Roofing Underlayment Rolls Calculator

Compute the number of rolls of synthetic roofing underlayment needed for a roof, including 10 % overlap and waste, given...

basic

3,827 4.6 1 min

Everyday Life

Propane Tank Refill Cost Calculator

Compute the cost to refill a propane tank from its current level to a target fill level (typically 80 % for safety), giv...

basic

4,549 4.3 1 min

Showing 265 to 276 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

Plank Hold Percentile Calculator

NPV from Multiple Cash Flows and Discount Rate Calculator

Two-Stroke Engine Fuel-Mix Calculator

Basketball Hollinger Game Score Calculator

Baseball Batting Average & On-Base Calculator

Sharpe Ratio Risk-Adjusted Return Calculator

Snell's Law Refraction & Critical Angle Calculator

Plant Spacing and Quantity Calculator

VDOT Estimator

Paint Coverage Calculator

Roofing Underlayment Rolls Calculator

Propane Tank Refill Cost Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost