CalculatorFox is a free online calculator library offering 1,336 calculators across 23 categories, each showing step-by-step workings and cited sources. It runs in the browser with no account required, and every calculator can be embedded on a website for free.
What is CalculatorFox?
CalculatorFox is a web-based calculator platform that hosts 1,336 free calculators organized into 23 categories, spanning loans, investments, business, fitness, tax, and date math. Users enter figures into a calculator and receive a computed result plus a live, step-by-step breakdown of how the answer was derived, with cited sources listed on each page. It runs entirely in the browser with no account needed, and the same calculators can be embedded into third-party websites.
What makes CalculatorFox stand out?
- 1,336 calculators across 23 categories — covering loans, credit and banking, investment and retirement, business pricing, tax and payroll, fitness, and date and time.
- Live step-by-step workings — every calculator displays its calculation steps, updating as figures change, such as the mortgage example showing loan amount, principal and interest, escrow items, and total monthly payment.
- Cited sources on every page — the mortgage calculator cites HUD Mortgagee Letter 2023-05 and 9 other sources.
- Free embedding — calculators can be added to a website with three lines of code, with no ads inside the embed and no tracking of readers.
- Account-stored starting figures — businesses can set the values a calculator opens with (interest rate, tax band, prices) and update them once so every embed follows on next load.
- Per-website tokens — each website gets its own token, colour, and figures, so partner sites can carry different rates.
- Field locking — any field a reader should not change can be locked in the embed builder.
- No account required — the free calculators are usable without signing up.
Who should use CalculatorFox?
- Website owners and publishers: embed a mortgage, loan, or margin calculator on their pages with their own starting figures and no ads.
- Financial advisers: produce reports and client pages under their own name, with scenarios grouped by client and one embed per website.
- Business and finance teams: model loan payments, profit margin, break-even, salary conversion, commission, ROI, and advertising cost.
- Individuals: run everyday calculations such as BMI, salary and annual income, percentage change, and business days.
What can you do with CalculatorFox?
- Publishers: embed a calculator with three lines of code, set the opening figures, and update a rate once so every embedded page reflects it on next load.
- Advisers: build client-facing reports and scenario pages under their own brand, with scenarios grouped by client.
- Business planners: price products using margin, markup, selling price, and break-even calculators, and model people costs with salary, overtime, and commission tools.
- Operations teams: plan capacity, shipping, and working days with the business day calculator, and model funding and fees with loan payment and financial ratio calculators.
How does CalculatorFox work?
A user opens any of the 1,336 calculators, enters figures, and sees the result alongside a numbered list of calculation steps that update live as inputs change. For embedding, the embed builder generates three lines of code; starting values are stored with the account rather than in page HTML, so changing a rate in one place updates every page showing that calculator on its next load.
Pricing
CalculatorFox is free to use and free to embed. Paid tiers are Personal (save and compare scenarios, export and share, no ads) and Advisor (reports and client pages under the user's own name, scenarios grouped by client, one embed per website).
