Math

Laws of Probability: Formulas, Examples and Probability Rules

Learn the laws of probability with simple formulas, clear explanations, solved examples, practice questions, and an interactive calculator. Perfect for IGCSE, GCSE, IB, AP, and high school math students.
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Math

Birthday Problem: Probability, Formula, Examples and Calculator

Learn the Birthday Problem with simple explanations, formulas, solved examples, practice questions, and an interactive calculator. Understand why 23 people are enough for a greater than 50% chance of a
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Math

Roll Two Dice: Probability, Sample Space, Sums and Examples

Learn roll two dice probability with sample space, sums, outcomes, solved examples, practice questions, and an interactive calculator. Perfect for IGCSE, GCSE, IB, AP, and high school math students.
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IB

Bayes’ Theorem Formula, Examples and Practice Questions

Learn Bayes’ Theorem with simple explanations, formulas, solved examples, practice questions, and a Bayes’ Theorem calculator. Perfect for IGCSE, GCSE, IB, AP, and high school students.
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Calculator

Reverse Mortgage Calculator 2026 — Free HECM Estimator (No Personal Info Required)

Use this free reverse mortgage calculator to estimate HECM loan amounts, monthly payments, fees, and remaining equity for 2026. No personal information required — 100% private.
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Calculator

Commission Calculator 2026 — Free Sales, Real Estate & Broker Split Calculator

Use this free commission calculator to estimate sales commission, real estate agent fees with broker splits, tiered commissions, and after-tax net earnings for 2026.
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Calculator

eBay Shipping Calculator 2026 — Free Shipping Cost, Fee & Profit Estimator | RevisionTown

Use this free eBay shipping calculator to estimate USPS, UPS & FedEx shipping costs, eBay 2026 final value fees, dimensional weight, and net seller profit. The best way to calculate
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Tools

International IQ Test — Free, Science-Based IQ Assessment | RevisionTown

Take the best free international IQ test with 40 pattern-recognition questions. Get official IQ test results with percentile ranking, bell curve visualization, and Wechsler classification. Instant, private, and scientifically normed.
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Tools

Photo Size Sorter & Resizer — Convert to All Social Media, Reels & Web Dimensions

Free photo sorter and batch resizer tool. Upload any image, instantly convert to Instagram, Facebook, TikTok, YouTube, website dimensions. Preview on phone, tablet, desktop and download all sizes.
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Calculator

Payroll Tax Refund Calculator 2026 – Estimate Your FICA Overpayment Refund | RevisionTown

Use our free Payroll Tax Refund Calculator for 2026 to estimate your FICA, Social Security & Medicare overpayment refund. Updated with $184,500 SS wage base.
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