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

Lawn Seed Coverage Calculator

Compute the pounds of grass seed needed for a lawn given the area and the recommended seed-rate (typically 5–10 lb/1000...

basic

6,072 3.9 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

811 4.6 1 min

Finance / Budgeting

Household Grocery Budget Calculator

Estimate monthly grocery spending from the number of adults, children, and a chosen USDA-style food-plan band (thrifty,...

basic

11,930 4.3 1 min

Ecology / Energy

Household Electricity Emissions Calculator

Estimate the annual CO₂ equivalent emissions from your home electricity use, given monthly kWh consumption and the carbo...

basic

11,774 4.7 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

22,250 4.1 1 min

Everyday Life

Rainwater Barrel Fill Time from Roof Area Calculator

Estimate how long it takes to fill a rainwater collection barrel from a sloped roof at a given rainfall rate. 1 inch of...

basic

15,636 4.4 1 min

Physics

Single Slit Diffraction Minimum Angle Calculator

Calculates the angular positions of diffraction minima (dark fringes) for single-slit Fraunhofer diffraction. Each order...

basic

19,232 5.0 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

17,673 4.9 1 min

Everyday Life

Daily Pet Food (kcal) from Pet Weight and Activity Level Calculator

Estimate the daily caloric needs (DER, daily energy requirement) for a dog or cat: resting energy requirement RER = 70 ·...

basic

8,240 4.7 1 min

Everyday Life

Extension Cord Gauge Calculator

Compute the voltage drop and percentage drop on a copper extension cord given AWG, one-way length, and current draw. Dro...

basic

12,688 4.8 1 min

Conversions / Mass

Mass Converter

Convert between grams, kilograms, pounds, ounces, and stones.

basic

17,190 4.2 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

13,696 4.1 1 min

Showing 193 to 204 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

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Browse categories

Marcus Laurent

Lawn Seed Coverage Calculator

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

Household Grocery Budget Calculator

Household Electricity Emissions Calculator

Series and Parallel Resistor Equivalent Resistance Calculator

Rainwater Barrel Fill Time from Roof Area Calculator

Single Slit Diffraction Minimum Angle Calculator

Tankless Water Heater GPM Sizing Calculator

Daily Pet Food (kcal) from Pet Weight and Activity Level Calculator

Extension Cord Gauge Calculator

Mass Converter

Lactate Threshold Heart Rate Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost