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

Linear Thermal Expansion from Coefficient and ΔT Calculator

Calculates the change in length due to thermal expansion: ΔL = α · L₀ · ΔT, where α is the linear expansion coefficient,...

basic

11,159 4.9 1 min

Sports

Lactate Threshold Heart Rate Calculator

Estimates lactate threshold heart rate (LTHR) as 85–92% of HRmax. Calculates heart rate zones: Z1 recovery, Z2 aerobic,...

basic

17,427 4.9 1 min

Sports

Basketball Effective Field Goal Percentage Calculator

Compute the effective field goal percentage of a basketball player or team — FG% adjusted to credit the extra value of t...

basic

2,901 4.0 1 min

Everyday Life

Cold Brew Coffee Ratio Calculator

Compute the coffee-to-water ratio for cold brew. Concentrate: 1:4 to 1:5; ready-to-drink: 1:8 to 1:12. Returns the grams...

basic

2,434 4.3 1 min

Statistics / Probability

Bayesian Posterior from Beta Prior and Binomial Likelihood Calculator

Updates a Beta(α, β) prior with n trials and k successes to get the posterior Beta(α+k, β+n−k). Returns posterior mean,...

basic

10,355 5.0 1 min

Everyday Life

Food Calorie & Macro Breakdown Calculator

Calculates total calories from macronutrients (protein, carbohydrates, fat) and shows percentage contribution of each ma...

basic

8,713 4.8 1 min

Everyday Life

File Download Time & Bandwidth Calculator

Calculates the estimated time to download or upload a file from file size and internet connection speed.

basic

6,435 4.6 1 min

Physics

RC Circuit Time Constant and Voltage Decay Calculator

Calculates RC time constant τ = R·C, voltage at time t: V(t) = V₀·e^(−t/τ), charge remaining Q(t), and the time to reach...

basic

2,964 4.0 1 min

Health

ARISCAT Perioperative Pulmonary Risk Score Calculator

Calculates ARISCAT score for postoperative pulmonary complication (PPC) risk from 7 variables: age, SpO₂, respiratory in...

basic

16,968 4.5 1 min

Statistics

Weibull Shape-Scale Reliability Calculator

Calculates Weibull reliability R(t), failure probability, hazard rate, and MTTF from shape parameter β and scale paramet...

basic

23,190 4.2 1 min

Sports

Baseball Fielding Percentage Calculator

Compute a baseball player's fielding percentage — the share of fielding chances cleanly converted: FP = (putouts + assis...

basic

11,863 4.3 1 min

Physics

Wave Speed Frequency and Wavelength Calculator

Calculates wave speed, frequency, or wavelength from the other two using the fundamental wave equation v = fλ. Works for...

basic

6,452 5.0 1 min

Showing 265 to 276 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

Linear Thermal Expansion from Coefficient and ΔT Calculator

Lactate Threshold Heart Rate Calculator

Basketball Effective Field Goal Percentage Calculator

Cold Brew Coffee Ratio Calculator

Bayesian Posterior from Beta Prior and Binomial Likelihood Calculator

Food Calorie & Macro Breakdown Calculator

File Download Time & Bandwidth Calculator

RC Circuit Time Constant and Voltage Decay Calculator

ARISCAT Perioperative Pulmonary Risk Score Calculator

Weibull Shape-Scale Reliability Calculator

Baseball Fielding Percentage Calculator

Wave Speed Frequency and Wavelength Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost