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

Oven Temperature Converter: °C, °F, and Gas Mark

Converts oven temperatures between Celsius, Fahrenheit (F = C×9/5 + 32), and UK Gas Mark (Gas Mark = (C − 121)/14). Hand...

basic

19,302 3.9 1 min

Everyday Life

Rain-Barrel Collection Volume Calculator

Estimate the gallons of rainwater collected from a roof during a storm: gallons = roof_area_sqft × rainfall_in × 0.6234...

basic

9,633 4.0 1 min

Sports

Baseball OPS (On-Base Plus Slugging) Calculator

Compute a batter's OPS from raw plate-appearance stats: OBP = (H + BB + HBP) / (AB + BB + HBP + SF); SLG = (1B + 2·2B +...

basic

596 4.4 1 min

Everyday Life

Heating Degree Days (7-Day) Calculator

Compute heating degree-days (HDD) for a 7-day window by summing max(0, base − daily_average_T) across each day. Used by...

basic

16,097 4.3 1 min

Health

Karvonen Target Heart Rate Zone Calculator

Calculates target heart rate training zones using the Karvonen (heart rate reserve) method from maximum heart rate, rest...

basic

23,763 4.4 1 min

Math

Fibonacci Nth Term and Sum Calculator

Calculates the nth Fibonacci number using Binet's closed-form formula and the sum of the first n Fibonacci numbers (S_n...

basic

23,405 4.3 1 min

Sports

MLB Earned Run Average (ERA) Calculator

Compute a baseball pitcher's earned run average — the league's most widely-cited rate stat: ERA = (Earned runs · 9) / In...

basic

3,729 4.1 1 min

Sports

Brzycki One-Rep Max (1RM) Calculator

Estimate the one-rep max for any compound lift from a sub-maximal weight × reps set using Matt Brzycki's classic formula...

basic

332 3.9 1 min

Everyday Life

Board-Foot Lumber Calculator

Compute the number of board feet for one or more pieces of lumber from the nominal thickness, width, and length: BF = T_...

basic

12,332 4.8 1 min

Everyday Life

Wood Fuel BTU Output Calculator

Estimate the heat (BTU) released by burning seasoned firewood from the species's typical BTU/cord rating, the number of...

basic

7,890 4.3 1 min

Ecology / Transport

Flight Emissions Calculator

Estimate the CO₂ equivalent emissions per passenger from a flight, given the great-circle distance and seating class. Us...

basic

13,120 4.1 1 min

Construction / Materials

Gravel Calculator

Compute the volume of gravel needed to fill a rectangular area to a chosen depth, plus the approximate weight in tonnes.

basic

24,588 4.0 1 min

Showing 109 to 120 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

Oven Temperature Converter: °C, °F, and Gas Mark

Rain-Barrel Collection Volume Calculator

Baseball OPS (On-Base Plus Slugging) Calculator

Heating Degree Days (7-Day) Calculator

Karvonen Target Heart Rate Zone Calculator

Fibonacci Nth Term and Sum Calculator

MLB Earned Run Average (ERA) Calculator

Brzycki One-Rep Max (1RM) Calculator

Board-Foot Lumber Calculator

Wood Fuel BTU Output Calculator

Flight Emissions Calculator

Gravel Calculator

Unit Conversion Without Typos: A Field Guide

Running Pace: How to Read Splits Without Getting Lost