BEng Civil Engineering; 8 years in project management.

Marcus Laurent

Contributor, Construction & Everyday Life

0 calculators 0 articles Member since Jun 2026

About the author

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

VDOT Estimator

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

Basic

8,934 4.1 1 min

Everyday Life

LED Bulb Retrofit Payback Period Calculator

Estimates the simple payback period in months for replacing incandescent or CFL bulbs with LED bulbs from wattage differ...

Basic

14,198 4.8 1 min

Physics

Heat Exchanger NTU-Effectiveness Calculator

Calculates NTU, heat transfer effectiveness, and actual heat duty for a counterflow heat exchanger from UA, flow rates,...

Basic

8,520 5.0 1 min

Sports

IWF Sinclair Coefficient and Total Calculator

Compute the IWF Sinclair coefficient and Sinclair total — the standard cross-bodyweight comparison metric for Olympic we...

Basic

23,224 4.1 1 min

Everyday Life

Sod Pallet Calculator

Compute the number of sod rolls and full pallets needed to cover a lawn of given square footage, including a 5% waste bu...

Basic

12,362 4.0 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

24,696 4.2 1 min

Everyday Life

Tankless Water Heater GPM Sizing Calculator

Estimate the minimum gallons-per-minute flow rating a tankless (on-demand) water heater needs to handle your simultaneou...

Basic

20,941 4.5 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

10,396 4.0 1 min

Physics

Gravitational Field Strength Calculator

Calculates the gravitational field strength g at a distance r from the centre of a spherical body of mass M.

Basic

19,573 4.5 1 min

Everyday Life

Snow Load on Roof Calculator

Estimate the snow load on a roof from the snow depth and snow density: load (lb/ft²) = depth (in) · density / 12. Report...

Basic

22,582 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

13,370 4.1 1 min

Statistics / Probability

Cantelli One-Sided Probability Bound Calculator

Applies the Cantelli inequality: P(X − μ ≥ kσ) ≤ 1/(1+k²), a tighter one-sided bound than Chebyshev. Also computes the t...

Basic

15,865 4.6 1 min

Showing 217 to 228 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

VDOT Estimator

LED Bulb Retrofit Payback Period Calculator

Heat Exchanger NTU-Effectiveness Calculator

IWF Sinclair Coefficient and Total Calculator

Sod Pallet Calculator

Lumber Board Feet from Dimensions Calculator

Tankless Water Heater GPM Sizing Calculator

Tennis Hold and Break Percentage Service Stats Calculator

Gravitational Field Strength Calculator

Snow Load on Roof Calculator

Snell's Law Refraction & Critical Angle Calculator

Cantelli One-Sided Probability Bound Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost