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Guides and reference charts

The calculators answer one question at a time. These are the tables, for when you want the whole thing in front of you, with the sources named and the disagreements between them shown rather than averaged away.

22 guides

Cooking & Kitchen

Cooking Oil Smoke Points

Smoke points for 21 oils and fats as ranges rather than single numbers, plus which oil each cooking method actually needs.

  • 21 oils and fats
  • 6 cooking methods
  • ranges, not single numbers

Pets & Animal Care

Dog Years to Human Years

Dog age in human years by breed size, because a Great Dane and a Chihuahua of the same age are decades apart.

  • 16 ages
  • 4 size bands
  • vet life stages

Cooking & Kitchen

Oven to Air Fryer Conversion

Temperatures and times for the air fryer, and why the usual "drop 25 degrees" rule fails on anything thick.

  • 8 temperatures
  • 8 foods
  • thickness rule

Pets & Animal Care

Cat Years to Human Years

Cat age in human years with life stages, and why size changes nothing for a cat when it changes everything for a dog.

  • 21 ages
  • AAFP life stages
  • no size effect

Health & Fitness

Heart Rate Zones by Age

Training zones for ages 20 to 70, plus how far an age-estimated maximum can be out, which is further than most charts admit.

  • 11 ages
  • 5 zones
  • error bars stated

Gaming & Esports

Mouse Sensitivity Conversion

Sensitivity factors for ten games, what eDPI really measures, and the one figure that means the same thing everywhere.

  • 10 games
  • eDPI explained
  • cm/360 bands

Social Media & Creator

Social Media Image Sizes

Dimensions and ratios for every placement, plus what each one crops, which is the part that actually ruins posts.

  • 8 image placements
  • 4 video
  • crop notes

Weather

Heat Index Chart

What the temperature actually feels like once humidity is counted, and what each risk band means for being outside.

  • 11 temperatures
  • 6 humidity columns
  • 4 risk bands

E-Commerce & Retail

Margin vs Markup

The same profit expressed two ways, plus the multiplier for any target margin. Mixing them up prices a catalogue a third too low.

  • 13 markups
  • 9 target margins
  • worked example

Home & DIY

Lumber Sizes: Nominal vs Actual

What every nominal board actually measures, in inches and millimetres, and why the name stopped matching the wood.

  • 17 board sizes
  • sheet goods
  • inches and mm

Tech & Digital

Data Sizes and Speeds

Why a 1 TB drive shows 931 GB and a 100 Mbps line downloads at 12.5 MB/s. Two factors explain nearly every confusing number in computing.

  • 5 units
  • 6 drive sizes
  • 6 connection speeds

Date & Time

Time Zone Abbreviations

Offsets for sixteen zones, plus the abbreviations that mean two or three different things. CST alone spans fourteen hours.

  • 16 zones
  • 5 collisions
  • DST notes

Unit Converters

Metric and Imperial Conversions

Conversion factors for length, weight and volume, with the exact ones marked exact so you know which you can safely shorten.

  • 3 tables
  • exact vs rounded
  • US and imperial

Automotive

Tire Size Codes

Every part of a tyre code decoded, with load and speed tables. It reads as nonsense because the numbers are in three different units.

  • 6 code parts
  • 7 speed ratings
  • 7 load indexes

Financial

How a Loan Amortizes

Where each payment actually goes year by year, why halfway in time is not halfway in balance, and what an extra payment saves.

  • 10 years shown
  • extra payment table
  • worked example

Parenting & Family

Pregnancy Weeks to Months

Weeks, months and trimesters side by side, and why the count starts two weeks before conception.

  • 9 months mapped
  • 5 term definitions
  • trimesters

Real Estate & Housing

DTI and LTV Thresholds

Every DTI and LTV threshold in one place, including the two different points at which mortgage insurance can come off.

  • 6 loan types
  • 8 LTV thresholds
  • PMI at 80 and 78

Education & Academic

GPA Scale Chart

Letters, percentages and points side by side, plus the weighted scale and why a 4.6 and a 3.9 can be the same transcript.

  • 13 letter grades
  • weighted scale
  • worked method

Math & Science

Unit Circle Chart

Sixteen angles with exact values, and the pattern that turns five facts into one idea worth remembering.

  • 16 angles
  • exact radicals
  • quadrant signs

Travel & Geography

Country Size Comparison

The fifteen largest countries by area, next to the table of what a Mercator map only appears to show.

  • 15 countries
  • 6 map illusions
  • distortion by latitude

Productivity Tools

What a Meeting Costs

A cost grid by headcount and salary, plus the annual figure for a recurring meeting, which is the number worth arguing about.

  • 20 cell grid
  • 4 cadences priced
  • loading breakdown

Lifestyle & Fun

Lottery Odds by Tier

Every prize tier with its real odds, what more tickets actually buys, and why the headline jackpot is not a sum of money.

  • 10 prize tiers
  • ticket volume table
  • 3 game matrices