Categories

Browse Tools by Category

Browse CalcTrail's calculators and converters by category — finance, health, math, engineering, date & time, academic, design, marketing, and AI. Every tool is free and runs right in your browser, no sign-up required.

Math & Conversions

7

Percentages, fractions, ratios, unit conversion, and scientific math for everyday calculations.

Engineering

9

Electrical, mechanical, and structural calculators for engineers, electricians, and builders.

Finance & Business

22

Loans, mortgages, savings, investing, retirement, and business finance.

Health & Fitness

7

BMI, body fat, calories, macros, hydration, and pace.

Date & Time

4

Date differences, exact age, durations, and time-zone conversion.

Academic

3

GPA, grades, and weighted averages for students and educators.

Design & Creative

2

Aspect-ratio and color-conversion tools for designers and developers.

Marketing

6

ROI, ROAS, CPM, CPC, and customer-value metrics for marketers.

AI & Machine Learning

5

LLM token, image, and speech cost estimation, plus AI project ROI.

Two ways to find a tool

The same tool can be reached either way, so use whichever matches how you are already thinking about the problem.

By subject

Nine categories covering finance, health, engineering, maths, dates, academic work, design, marketing and AI. Use these when you know the field but not the tool — a category page lists everything in it, calculators and converters together.

By what it does

Converters translate a value from one representation into another — metres to feet, a time between zones, a colour between HEX and RGB. If that is the shape of what you need, they are all on one page.

Browse all converters