Simple Calculator

Scout Review

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Free online calculator hub with 40+ tools for finance, he...

Finance

Health & Wellness

Productivity

Consumer Tools

Education

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Updated Aug 21, 2026

About

Simple Calculator is a family-run project offering a growing collection of free online calculators. It covers everything from everyday math like percentages and discounts to UK-specific financial tools for mortgages, VAT, and salary. There are also health calculators for BMI and calories, scientific tools for trigonometry, and automotive calculators for fuel costs and EV comparisons. All tools are fast, mobile-friendly, and require no registration. The site is perfect for quick calculations on the go, whether you're budgeting, studying, or just curious.

68/100

Scout Review

Design (UI)

Usability (UX)

Security

Speed

Accessibility

Growth Potential

Neutral

0Feedbacks

Positive

Neutral

Negative

Target Customer Profile

Demographic

UK homeowners and potential buyers

Pain Points

Confused about mortgage repayments, stamp duty, and affordability. Need quick estimates without complex spreadsheets.

Primary Needs

Accurate UK-specific mortgage, stamp duty, and affordability calculators that work on any device.

Demographic

Students and teachers

Pain Points

Need scientific and math tools for homework and exam prep, often on a tight budget.

Primary Needs

Free, accessible calculators for trigonometry, logarithms, and unit conversions that are easy to use.

Demographic

Drivers and EV enthusiasts

Pain Points

Trying to compare fuel costs or understand vehicle specs like tyre size, gear ratio, and power-to-weight.

Primary Needs

Automotive calculators to estimate expenses, convert units, and make informed vehicle decisions.

Alternatives

Calculator.net

A similar free calculator website with a wide range of financial, math, and health tools.

RapidTables

Offers calculators and converters for math, finance, and more, with a focus on user-friendly interfaces.

Omni Calculator

A comprehensive calculator app with hundreds of specialized tools and formulas.

scoutforge

Aug 21, 2026

Scout Review

Simple Calculator is a fast, free, and mobile-friendly collection of 40+ calculators with a UK focus. Design is average but functional, usability is decent with clear categories, and speed is excellent. Security and accessibility have room for improvement. Growth potential exists in the UK niche, but competition is fierce. A solid start for a new site.

Design (UI)

Consistent card grid and icons, dark navy theme. Repetitive subheads and cramped hero pills reduce polish. Average but functional.

Usability (UX)

Clear category navigation and no registration. But no search bar, repetitive card descriptions, and dense grids hurt scannability.

Speed

Lighthouse mobile 98/100, desktop 100/100. LCP 2.2s, CLS 0, TBT 60ms. Exceptionally fast and lightweight.

Security

HTTPS and HSTS present, SPF/DMARC set. Missing CSP, frame protection, and other headers. No compliance certifications found.

Accessibility

Lighthouse 86/100 with contrast, lang, landmark, and label issues. No a11y statement. Keyboard navigation likely works but not verified.

Growth Potential

Real problem, UK-specific niche, but crowded market. Differentiators exist but not enough to stand out yet.

Key Features

40+ free calculators covering finance, health, automotive, and more.
UK-specific tools like mortgage, stamp duty, and VAT calculators.
Fast, mobile-friendly, and no registration required.

Improvement Areas

Add a search bar for quick calculator discovery.
Improve accessibility with better contrast and semantic HTML.
Enhance security headers and consider compliance certifications.

Design & Usability

The site uses a consistent card grid with icons, making it easy to scan. Dark navy theme with blue accents is decent. However, repetitive subheads and cramped hero pills reduce polish. Usability is solid with clear category navigation, but the lack of a search bar and generic card descriptions hurt scannability. Overall, it's functional but not memorable.

Speed & Security

Performance is outstanding—Lighthouse scores 98/100 mobile and 100/100 desktop, with fast LCP and zero layout shift. Security is basic: HTTPS and HSTS are in place, but missing CSP and other headers. No compliance certifications found, which is typical for a small site. Speed is a clear strength; security is adequate but not exceptional.

Accessibility & Growth

Accessibility scores 86/100 but has notable issues: contrast, missing lang, no main landmark, and label problems. No a11y statement. Growth potential is moderate—UK-specific tools like stamp duty and EV calculators are a differentiator, but the market is crowded with established players. The idea is sound, but execution needs to stand out more.

Conclusion

If you need quick UK-specific calculations without signing up, this site delivers. It's not going to win design awards, but it's fast and covers a wide range of needs. With some polish on accessibility and a search bar, it could become a go-to resource. Worth a bookmark for UK homeowners and students.

Suggestions for Improvement

Add a search bar on the homepage to quickly find calculators.
Improve color contrast and add lang attribute to meet WCAG.
Add a main landmark and accessible names to form elements.
Reduce repetitive subheads to improve visual hierarchy.

AI-generated editorial review — scores out of 100.

Alternatives Comparison

Features	Simple Calculator	Calculator.net	RapidTables	Omni Calculator
Number of calculators	40+	Hundreds	Dozens	300+
UK-specific tools	Yes (mortgage, stamp duty, VAT)	Limited		Some
Registration required
Mobile-friendly
Search functionality