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Formulexa

Clear answers, documented formulas

Free online calculators for school, finance, projects & work

Formulexa delivers transparent calculations for grades, percentages, loans, mortgages, materials, salaries, taxes, job offers, and cost-of-living scenarios — with documented formulas and no signup.

Start calculatingBrowse categories
  • AccurateDocumented formulas.
  • Private by defaultNothing is stored.
  • Free to useNo signup required.

All 24 calculators

Find a calculator

Search Formulexa’s free online calculator tools by task or filter by suite. Compare student, project material, salary, math, and finance calculators without browsing unrelated categories.

24 calculators found

Featured calculators

Featured calculator tools

Essential calculation tools for academic goals, finance, landscaping, and wage comparisons.

Calculator categories

Find the right tools for your needs

How the tools work

Simple, fast and reliable

Built from the ground up for speed, privacy, and mathematical clarity with zero bloat or accounts required.

  • Runs in your browser

    Fast

    Calculations run immediately in your browser with no network delay.

    Client-side execution
  • Documented math

    Transparent

    Formulas, assumptions, worked examples, and boundary limits are fully shown.

    Visible formulas & limits
  • No account required

    No signup

    Every calculator works instantly without an account, email, or paywall.

    Instant anonymous access
  • Values excluded from analytics

    Private by default

    Calculator inputs stay isolated in browser memory and are never sent to analytics.

    Inputs stay on device
Why FormulexaEditorial standards reviewed

Focused tools with the working shown

Formulexa publishes a small, carefully maintained library instead of a directory of thin tools. Each calculator connects its inputs to a documented formula, explains assumptions and limits, and runs without an account.

Purpose & Responsibility

Learn about our editorial mission, transparency standards, and commitment to reliable, deterministic tools.

Read our purpose

Calculation Methodology

Explore our documented formulas, tested boundary conditions, and rounding algorithms.

View methodology

Questions & Corrections

Found an edge case or have feedback? Reach out directly to our engineering team.

Send a correction or question

Built on trust

Calculation standards you can rely on

Formulas live in typed, version-controlled code and are tested against documented examples, boundaries, and conversions. Estimates identify the assumptions that affect them.

Read our methodology

Frequently asked questions

Common questions

Are these calculators really free to use?
Yes. Every calculator is free and works without payment; V1 does not offer paid calculations, supplier sales, or premium tiers.
Do I need to create an account?
No. V1 does not provide accounts or saved projects, so every calculator works anonymously.
Where do the formulas and data come from?
Formulas live in typed, version-controlled code and are tested against documented examples, boundaries, and conversions. Each calculator page shows its formula and the assumptions behind it.
Are my inputs or results stored anywhere?
No. Calculations run in your browser. Inputs are not sent to our server, stored in localStorage, or included in product analytics events.
Which calculator should I use?
Choose Grade Calculator for weighted coursework, Final Grade Calculator for a required exam score, Easy Grader for question-count scoring, Gravel or Topsoil for material estimates, and the salary tools for gross-pay conversions or raises.

Guides & resources

Learn how calculations work