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

Everyday Life / Travel

EV Charging Cost per Mile Calculator

Calculates electric vehicle energy cost per mile from electricity rate and vehicle efficiency in kWh per mile.

basic

12,392 4.0 1 min

Everyday Life

Microwave Time Power Conversion Calculator

Adjust a recipe's microwave time when your microwave's wattage differs from the wattage the recipe was written for: t_ne...

basic

15,650 4.8 1 min

Everyday Life

HVAC Airflow CFM Calculator

Compute the required HVAC airflow in cubic feet per minute (CFM) for a room from its volume and the target air changes p...

basic

11,455 4.9 1 min

Fitness / Strength

One Rep Max Calculator

Estimate one-rep max from weight lifted and reps using the Epley formula.

basic

6,132 3.8 1 min

Sports

Duckworth-Lewis-Stern Revised PAR Target Calculator

Estimates a revised second-innings cricket target using a simplified Duckworth-Lewis-Stern resource model from first-inn...

basic

11,488 4.5 1 min

Statistics

Confidence Interval for Proportion Calculator

Calculates the confidence interval for a population proportion from sample proportion, sample size, and chosen confidenc...

basic

5,056 4.5 1 min

Food / Cooking

Brine Ratio Calculator

Compute the mass of salt needed to make a brine of a given percentage strength (by weight) for a target water volume — u...

basic

2,048 4.9 1 min

Everyday Life

Christmas Light String Wattage Calculator

Compute the total watts and amps drawn by a Christmas / holiday lighting display: total_W = strings × bulbs_per_string ×...

basic

19,335 4.3 1 min

Everyday Life

Pool Heater BTU Sizing Calculator

Estimate the BTU/h heater output required to raise a swimming pool from its current to a target temperature within a des...

basic

3,443 4.8 1 min

Finance

Economic Order Quantity (EOQ) Calculator

Calculates the Economic Order Quantity (EOQ) that minimises total inventory costs from annual demand, ordering cost, and...

basic

20,546 4.1 1 min

Everyday Life

LED vs Incandescent Bulb Annual Savings Calculator

Compute the yearly energy and dollar savings from replacing an incandescent bulb with an equivalent-output LED. Inputs:...

basic

22,537 4.0 1 min

Sports

Sprint Split Velocity Calculator

Calculates sprint velocity and 100 m split pace from segment distance and elapsed time.

basic

8,454 4.7 1 min

Showing 13 to 24 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

EV Charging Cost per Mile Calculator

Microwave Time Power Conversion Calculator

HVAC Airflow CFM Calculator

One Rep Max Calculator

Duckworth-Lewis-Stern Revised PAR Target Calculator

Confidence Interval for Proportion Calculator

Brine Ratio Calculator

Christmas Light String Wattage Calculator

Pool Heater BTU Sizing Calculator

Economic Order Quantity (EOQ) Calculator

LED vs Incandescent Bulb Annual Savings Calculator

Sprint Split Velocity Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost