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

4,504 4.5 1 min

Finance

Break-Even Rental Price for Landlord Calculator

Calculates the minimum monthly rent a landlord must charge to cover mortgage payment and expenses, accounting for expect...

basic

6,276 4.5 1 min

Finance

Net Present Value of a Growing Annuity Calculator

Compute the present value of a growing annuity — a finite stream of cash flows that grow at a constant rate g per period...

basic

22,413 4.5 1 min

Sports

Speedrun Pace Calculator

Project a speedrun final time from the current elapsed time and the percentage of the run already completed. Reports the...

basic

8,118 4.8 1 min

Everyday Life

Slab Rebar Grid Calculator

Compute the total number of rebar lengths and the total linear footage required for an orthogonal grid in a concrete sla...

basic

21,392 3.9 1 min

Sports

Cooper 12-Minute Run VO₂max Calculator

Estimate VO₂max in mL/(kg·min) from the distance covered during the Cooper 12-minute run test using the regression VO₂ma...

basic

10,546 4.1 1 min

Sports

NFL Passer Rating Calculator

Compute the standard NFL passer rating (0–158.3) from completions, attempts, yards, touchdowns, and interceptions, using...

basic

16,766 4.5 1 min

Sports

Tennis First-Serve Percentage from Serves-In and Serves-Out Calculator

Compute a tennis player's first-serve percentage from a match's serve summary: First-serve % = (first serves in) / (tota...

basic

3,649 4.8 1 min

Sports

Rowing Stroke Rate from Meters and Time Calculator

Compute the rowing stroke rate (strokes per minute) from total strokes and elapsed time, plus the 500 m pace from total...

basic

9,598 3.8 1 min

Health

Karvonen Target Heart Rate Zone Calculator

Calculates target heart rate training zones using the Karvonen (heart rate reserve) method from maximum heart rate, rest...

basic

9,458 4.6 1 min

Sports

Tennis Hold and Break Percentage Service Stats Calculator

Calculates effective service point win percentage from first-serve-in percentage and point win rates on first and second...

basic

13,969 4.0 1 min

Ecology / Transport

Car Trip Emissions Calculator

Estimate the CO₂ equivalent emissions for a single car trip, given the trip distance, the vehicle's fuel consumption, an...

basic

14,427 4.7 1 min

Showing 85 to 96 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

Calcify

Browse categories

Marcus Laurent

Linear Thermal Expansion from Coefficient and ΔT Calculator

Break-Even Rental Price for Landlord Calculator

Net Present Value of a Growing Annuity Calculator

Speedrun Pace Calculator

Slab Rebar Grid Calculator

Cooper 12-Minute Run VO₂max Calculator

NFL Passer Rating Calculator

Tennis First-Serve Percentage from Serves-In and Serves-Out Calculator

Rowing Stroke Rate from Meters and Time Calculator

Karvonen Target Heart Rate Zone Calculator

Tennis Hold and Break Percentage Service Stats Calculator

Car Trip Emissions Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost