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

Coulomb's Law Electrostatic Force Between Two Charges Calculator

Calculates the electrostatic force between two point charges using Coulomb's law: F = k·|q₁·q₂|/r², where k = 8.9875×10⁹...

basic

1,147 4.0 1 min

Everyday Life

Drywall Sheets Needed for a Room Calculator

Compute how many 4 × 8 ft (32 ft²) drywall sheets are needed to finish all four walls and the ceiling of a rectangular r...

basic

18,143 4.0 1 min

Sports

Climbing Grade French → Yosemite Decimal Converter Calculator

Convert a French sport-climbing grade entered as a numeric proxy (e.g. 5.0 = French 5a, 6.0 = 6a, 6.5 = 6b, 7.0 = 7a, 7....

basic

10,249 4.0 1 min

Food / Cooking

Dough Hydration Calculator

Compute baker's percentage hydration of a bread dough from the flour and water weights, plus the recommended water for a...

basic

10,981 4.1 1 min

Everyday Life

Wattage to Amps Converter Calculator

Convert an appliance's power rating (watts) to a current draw in amps at a given voltage and power factor: A = W / (V ·...

basic

18,791 4.4 1 min

Physics

Motor Locked-Rotor Starting Current Calculator

Estimates motor starting (locked-rotor) current from rated kW, voltage, full-load current, and starting current multipli...

basic

9,453 4.2 1 min

Physics

Arc Weld Heat Input per mm Calculator

Calculates weld heat input in kJ/mm from welding voltage, current, travel speed, and arc efficiency for standard arc wel...

basic

20,289 3.8 1 min

Math / Percentage

Fast Modular Exponentiation Calculator

Calculates a^e mod m using repeated squaring. Essential for RSA, Diffie-Hellman, and primality tests. Works for large va...

basic

22,689 4.2 1 min

Everyday Life

Generator Fuel Runtime Calculator

Estimate how many hours a portable generator will run on a full tank, given the tank size in gallons and the fuel-consum...

basic

14,390 3.9 1 min

Sports

Triathlon Bike & Run Pace Calculator

Calculates total triathlon finish time and average run pace from swim time, bike time, transition times, run distance, a...

basic

11,682 4.0 1 min

Everyday Life

Wall Paint Area Minus Doors and Windows Calculator

Calculates the net wall area = perimeter × height − (doors + windows area). Then estimates litres needed = net area × co...

basic

10,686 4.3 1 min

Sports

VO₂max from Rockport One-Mile Walk Test Calculator

Estimate VO₂max (mL/kg/min) from the Rockport one-mile walk test using Kline et al.'s regression: VO₂max = 132.853 − 0.0...

basic

7,949 4.9 1 min

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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

Coulomb's Law Electrostatic Force Between Two Charges Calculator

Drywall Sheets Needed for a Room Calculator

Climbing Grade French → Yosemite Decimal Converter Calculator

Dough Hydration Calculator

Wattage to Amps Converter Calculator

Motor Locked-Rotor Starting Current Calculator

Arc Weld Heat Input per mm Calculator

Fast Modular Exponentiation Calculator

Generator Fuel Runtime Calculator

Triathlon Bike & Run Pace Calculator

Wall Paint Area Minus Doors and Windows Calculator

VO₂max from Rockport One-Mile Walk Test Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost