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1,000+ Free Calculators & Tools

Every Calculator & Converter
You Will Ever Need (Updated!)

Simple, accurate and fast online calculators for math, electrical, finance, grades, time and much more.

Explore All Calculator Categories

Eight powerful categories covering every calculation you need — from daily math to complex electrical engineering.

Time & Date

60+ Tools

Age calculators, timezones, countdowns, date differences, stopwatch and calendar tools.

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Math

50+ Tools

Percentage, fractions, scientific calculator, algebra, statistics and more math tools.

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Electrical

45+ Tools

Ohm's law, voltage drop, watts, amps, kW conversions and electricity bill calculators.

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Wire Gauge

6+ Tools

AWG to MM conversions, SWG calculators, voltage drop calculations for wire sizing.

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Lighting

10+ Tools

Lumens, lux, watts to lumens, LED wattage and room lighting calculators.

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Grade

15+ Tools

GPA, CGPA, final grade, test score, letter grade and college GPA calculators.

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Financial

5+ Tools

Compound interest, loan repayment, savings, investment and budgeting calculators.

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Paycheck

15+ Tools

Salary, hourly paycheck, after-tax take-home pay calculators for all US states.

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Recently Added Calculators

Fresh tools added to the platform — be the first to try them.

NEW

SWG to MM Calculator

Convert Standard Wire Gauge (SWG) to millimeters and cross-sectional area.

Wire Gauge Open →
NEW

Letter Grade to GPA

Convert letter grades (A, B+, C−) to GPA values on a 4.0 or custom scale.

Grade Open →
NEW

Energy Cost Calculator

Calculate the running cost of any appliance per hour, day, month, or year.

Electrical Open →
NEW

Binary Calculator

Perform binary arithmetic operations and convert between binary, decimal and hex.

Math Open →
NEW

High School GPA Calculator

Calculate your high school GPA using weighted or unweighted grading scales.

Grade Open →
NEW

Power Factor Calculator

Calculate power factor, apparent power, and reactive power for AC circuits.

Electrical Open →

Why Choose OnlineConvers?

Built for speed, accuracy and trust — no sign-up, no ads, no gimmicks.

Instant Results

Get results the moment you type — no waiting, no loading screens, just instant answers.

Privacy First

All calculations happen locally in your browser. We never see or store any data you enter.

Browser Based

Works on any modern browser — Chrome, Firefox, Safari, Edge — on any platform.

No Installation

Nothing to download or install. Open a calculator and start using it immediately.

Mobile Friendly

Every tool is fully responsive and optimised for smartphones and tablets.

Always Free

Every calculator on OnlineConvers is completely free — no paywalls or premium tiers.

Accurate Calculations

Industry-standard formulas reviewed by subject matter experts for reliable results.

Regularly Updated

New tools added regularly and existing calculators kept up-to-date with current standards.

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Latest from the Blog

Guides, explainers and tips to help you understand the calculations better.

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Frequently Asked Questions

Everything you need to know about using OnlineConvers.

Yes, every single calculator and converter on OnlineConvers is 100% free. There are no subscriptions, no paywalls and no registration required. Simply visit the tool you need and start calculating immediately.
Our calculators use industry-standard formulas and are regularly reviewed for accuracy. Calculations are performed in real-time in your browser using precise mathematical methods. While we strive for maximum accuracy, we always recommend verifying critical financial or engineering calculations with a qualified professional.
No installation is required whatsoever. All tools run entirely within your web browser on any device — desktop, laptop, tablet or smartphone. Just open the calculator and start using it.
Absolutely. All calculations are performed locally in your browser. We never transmit, store or have access to any data you enter into our calculators. Your financial figures, grades or any other personal inputs never leave your device.
Yes! All calculators on OnlineConvers are fully responsive and optimised for mobile devices, tablets and desktop computers. The interface adapts to your screen size for the best possible experience on any device.
We regularly add new calculators and update existing ones to ensure accuracy and relevance. Check our "Recently Added" section on the homepage to discover the newest tools. You can also follow our blog for announcements and guides.