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Read practical guides that explain the formulas behind Toolarithm calculators and printable tools. Published guides include worked examples, decision notes, and links back to the calculator or reference page that uses the formula.

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Published library

20 guides

Finance explainers4
Math explainers5
Converter references4
Graph paper guides3
Science explainers3
Engineering guides1
Editorial queue6
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Finance guides

Money guides explain interest, debt payoff, compounding, income assumptions, and how finance calculator outputs should be interpreted.

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How Amortization WorksLearn how loan payments split between principal and interest, why early payments are interest-heavy, and how extra payments change payoff cost.APR vs APY GuideCompare APR and APY, understand why compounding changes the effective rate, and know which rate to use for loans, CDs, and savings.Compound Interest ExamplesReview compound interest examples for lump sums, recurring deposits, future value, present value, and growth-rate comparisons.Debt Snowball vs AvalancheCompare debt payoff methods by motivation, interest savings, balance order, APR order, and practical fit for different budgets.

Math guides

Math guides make formulas readable before users apply them in percentage, algebra, geometry, and statistics calculators.

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Percentage Formulas GuideLearn percent of a value, part of total, percent change, increase, decrease, and decimal conversion formulas with examples.Slope and Intercept ExplainedUnderstand slope, y-intercept, point-slope form, slope-intercept form, vertical lines, and how coordinate formulas connect.Area Formulas Printable ReferenceReview rectangle, square, triangle, circle, trapezoid, parallelogram, and compound-shape area formulas with printable notes.Radians vs Degrees GuideLearn radians vs degrees, conversion formulas, unit circle notation, pi multiples, and when each angle unit is useful.Basic Statistics GuideLearn mean, median, mode, variance, standard deviation, percentile, and z-score formulas with examples and method notes.

Converters guides

Converter guides explain unit factors, exact definitions, common reference values, and mistakes that happen when dimensions change.

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Metric vs Imperial GuideCompare metric and imperial units, SI base units, exact inch-pound factors, area, volume, and conversion mistakes.Common Unit Conversions GuideReview common mass, temperature, speed, and pressure conversions with formulas, examples, and SI source references.Time and Data Conversion GuideLearn data storage units, decimal vs binary prefixes, duration assumptions, time zones, and Unix timestamps.Kitchen Conversions GuideLearn exact and practical kitchen conversions for cups, tablespoons, teaspoons, milliliters, liters, and recipe scaling.

Graph Paper guides

Graph paper guides compare paper sizes, grid spacing, printable templates, worksheet planning, and scale checks.

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Engineering Graph Paper GuideChoose engineering graph paper for sketches, calculations, scale diagrams, isometric views, semi-log plots, and print-ready notes.A4 Graph Paper TemplatesCompare A4 graph paper templates for square, dot, isometric, polar, and semi-log grids with spacing, margins, and print checks.Letter Graph Paper TemplatesCompare Letter graph paper templates for US printers with grid spacing, margins, PDF output, and printable worksheet links.

Science guides

Science guides connect formulas, units, and source notes for educational chemistry and future technical calculators.

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Chemistry Concentration BasicsLearn molarity, dilution, molar mass, pH, pOH, concentration units, formulas, and source-backed chemistry calculation checks.Physics Formula Worksheets GuideBuild physics formula worksheets with Ohm's law, power, kinetic energy, velocity, acceleration, SI units, and conversion checks.Lab Report Calculations GuideStructure lab report calculations with known values, formulas, units, significant figures, percent error, density, and source notes.

Engineering guides

Engineering guides keep assumptions, units, diagrams, and simplified formula limits visible beside technical calculators.

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Engineering Notes on Graph Paper GuideCreate engineering notes on graph paper with known values, formulas, unit conversions, diagrams, assumptions, and source-backed checks.
Editorial Queue

Topics waiting for full examples and source checks

These cards show what the content team is preparing next. A topic becomes a public guide only after it has a complete explanation, a worked example, related calculator links, and source checks where an outside reference is needed.

FinancePlanned

Inflation and Buying Power Guide

Explain future cost, cumulative inflation, real purchasing power, and when inflation assumptions become misleading.

Income and inflation

FinancePlanned

Salary to Hourly Conversion Guide

Compare salary, hourly rate, paid time off, unpaid leave, overtime, and pay-period assumptions.

Pay conversion

FinancePlanned

Budget Percentage Examples

Show how income shares, category caps, remaining cash flow, and over-budget states work in monthly plans.

Budgeting

Graph PaperPlanned

Graph Paper for Science Lab Notes

Prepare graph paper guidance for plotting lab observations, recording units, checking scales, and separating raw data from analysis.

Science graph paper

SciencePlanned

Scientific Notation and Significant Figures

Cover scientific notation, rounding, significant figures, and measurement precision for future science calculators.

Measurement

SciencePlanned

Unit Conversion Formula Guide

Prepare conversion-factor explanations for length, area, volume, mass, time, temperature, and speed tools.

Converters

Editorial Structure

How guides support the tool library

Calculator-backed

Guides link back to live calculators so users can move from explanation to calculation without searching again.

Formula-first

Each topic starts from the formula, defines the variables, and adds examples that show where the result can be misread.

Clearly labeled queue

Unpublished topics stay separate from finished guides so users never land on thin placeholder pages.

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