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

Chess Elo Rating Update Calculator

Compute the new Elo rating of a chess player after a single game using R' = R + K · (S − E), where E = 1 / (1 + 10^((R_o...

basic

14,170 4.2 1 min

Sports

Rugby League Points Differential Calculator

Calculates rugby league points differential and average points per game from total points scored and conceded over a sea...

basic

16,778 4.4 1 min

Sports

Tennis Tiebreak Win Odds Calculator

Calculates the probability of winning a 7-point tennis tiebreak given the probability of winning any individual point.

basic

6,621 4.7 1 min

Finance

Revenue Growth Rate from Two Periods Calculator

Computes year-over-year revenue growth = (Rev₂ − Rev₁) / Rev₁ × 100%, and CAGR over n years = (Rev₂/Rev₁)^(1/n) − 1.

basic

9,757 4.1 1 min

Everyday Life

Bathroom Vent-Fan CFM by Area Calculator

Size a bathroom exhaust fan in CFM using the Home Ventilating Institute target of 8 air changes per hour: CFM = area_sq_...

basic

10,387 4.2 1 min

Physics

Series and Parallel Resistor Equivalent Resistance Calculator

Calculates equivalent resistance for up to four resistors in series (R_eq = R₁+R₂+R₃+R₄) or in parallel (1/R_eq = 1/R₁+1...

basic

10,747 4.8 1 min

Everyday Life

Paver-Base Sand Cubic-Yards from Area and Depth Calculator

Compute the cubic-yards and tons of sand bedding needed under a paver patio or walkway given the area and bedding depth....

basic

18,093 4.9 1 min

Sports

Critical Swim Speed (CSS) from 200 m / 400 m Calculator

Compute Critical Swim Speed — the swimmer's analogue of running's lactate threshold — from a 200 m and 400 m time-trial...

basic

21,245 4.9 1 min

Food / Drinks

Tea Brewing Calculator

Compute the grams of loose-leaf tea and the volume of water needed to brew a target number of 8 oz cups at a chosen stre...

basic

3,774 3.9 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

23,001 4.5 1 min

Everyday Life

Meat Brine Salt Quantity Calculator

Compute the amount of salt to dissolve in water for a wet brine, given the water volume and a target salt percentage by...

basic

20,689 4.4 1 min

Sports

MTG London Mulligan Lands Probability Calculator

Compute the hypergeometric probability of drawing exactly k lands in a 7-card opening hand from a deck of size N contain...

basic

4,049 4.1 1 min

Showing 85 to 96 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

Chess Elo Rating Update Calculator

Rugby League Points Differential Calculator

Tennis Tiebreak Win Odds Calculator

Revenue Growth Rate from Two Periods Calculator

Bathroom Vent-Fan CFM by Area Calculator

Series and Parallel Resistor Equivalent Resistance Calculator

Paver-Base Sand Cubic-Yards from Area and Depth Calculator

Critical Swim Speed (CSS) from 200 m / 400 m Calculator

Tea Brewing Calculator

Baseball Batting Average & On-Base Calculator

Meat Brine Salt Quantity Calculator

MTG London Mulligan Lands Probability Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost