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

Compost Pile Carbon Nitrogen Mix Calculator

Estimates the carbon-to-nitrogen ratio of a compost mix from brown (high C) and green (high N) material masses using typ...

basic

11,657 3.9 1 min

Health

Fractional Excretion of Urea (FeUrea) Calculator

Calculates FeUrea = (urine urea × serum creatinine) / (serum urea × urine creatinine) × 100%. FeUrea < 35% suggests pre-...

basic

7,073 3.8 1 min

Everyday Life

Straight-Line Car Depreciation Per Year Calculator

Compute the straight-line annual depreciation of a vehicle: (purchase price − residual value) / useful life in years. Re...

basic

23,783 4.1 1 min

Finance

Enterprise Value (EV) from Market Cap, Debt, Preferred, NCI, and Cash Calculator

Compute the enterprise value (EV) — the takeover or capital-structure-neutral value of a firm: market cap + total debt +...

basic

22,287 4.9 1 min

Ecology / Energy

Solar Roof Savings Calculator

Estimate the annual generation (kWh) and electricity-bill savings from a rooftop solar PV system, given system size, pea...

basic

4,558 4.6 1 min

Sports

Sit-Up Test Percentile Calculator

Compute an approximate percentile rank for a 1-minute sit-up test using a normal-distribution model fit to ACSM age- and...

basic

23,190 4.1 1 min

Everyday Life

Coffee Grams per Cup by Brew Strength Calculator

Compute the grams of ground coffee needed for a given cup of brew at a chosen strength. Standard SCAA Golden Cup ratio i...

basic

12,561 4.8 1 min

Construction / Materials

Paint Calculator

Estimate how many gallons or liters of paint you need, allowing for coats and coverage.

basic

9,477 4.0 1 min

Everyday Life

Deck Board Quantity & Joist Spacing Calculator

Calculates how many deck boards are needed for a rectangular deck from deck dimensions, board width, gap, and board leng...

basic

6,541 3.9 1 min

Everyday Life

Sourdough Starter Feed Ratio Calculator

Compute the grams of flour and water to add to a sourdough starter at a chosen feed ratio (e.g. 1:5:5), which dictates h...

basic

1,485 4.5 1 min

Sports

Cooper 12-Minute VO₂max Estimate Calculator

Estimates VO₂max (mL/kg/min) from the distance covered in the Cooper 12-minute run test using the standard regression fo...

basic

22,571 4.0 1 min

Statistics / Probability

Pearson Chi-Square from Contingency Table Calculator

Calculates χ² = Σ(O−E)²/E from observed and expected frequencies in up to a 4-cell (2×2) contingency table, and indicate...

basic

1,391 4.1 1 min

Showing 49 to 60 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

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Browse categories

Marcus Laurent

Compost Pile Carbon Nitrogen Mix Calculator

Fractional Excretion of Urea (FeUrea) Calculator

Straight-Line Car Depreciation Per Year Calculator

Enterprise Value (EV) from Market Cap, Debt, Preferred, NCI, and Cash Calculator

Solar Roof Savings Calculator

Sit-Up Test Percentile Calculator

Coffee Grams per Cup by Brew Strength Calculator

Paint Calculator

Deck Board Quantity & Joist Spacing Calculator

Sourdough Starter Feed Ratio Calculator

Cooper 12-Minute VO₂max Estimate Calculator

Pearson Chi-Square from Contingency Table Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost