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What people solve here

Real questions, real answers.

Each tool uses the exact formula professionals use. We show the math so you trust the result.

01
"Is my dog safe right now?"
Theobromine toxicity assessment in under 10 seconds — with a clear action recommendation.
02
"What will this mortgage cost me?"
Real monthly payment broken down into principal and interest, plus how extra payments change everything.
03
"Am I at a healthy weight?"
Body mass index from the WHO-standard formula. Instant result with context — not just a number.
04
"What should I charge per hour?"
Accounts for taxes, downtime, and expenses using the formula accountants use.
05
"How much should I eat to lose weight?"
TDEE from the Mifflin-St Jeor equation — the one used by registered dietitians.
06
"When is my baby due?"
Due date from Naegele's rule, the same method your midwife uses. Includes milestones.
Why people trust toolzip
Transparency

Every formula shown

We don't hide the math. Every tool shows the exact formula and where it comes from.

Privacy

Zero data retention

Nothing is uploaded or stored. All processing happens directly in your browser.

Quality

Expert-verified sources

Medical, financial, and scientific formulas are verified against published sources.

Browse all tools

Find what you need

87 tools available
healthFeatured

Pregnancy Week Calculator

Find out exactly how far along you are and your estimated due date based on your last period or conception date.

developerFeatured

JSON Formatter & Validator

Format, validate, and minify your JSON data. Catch syntax errors instantly.

financeFeatured

Tip Calculator

Quickly calculate the tip and split the bill among friends. No more awkward math at the dinner table.

healthFeatured

BMI Calculator

Calculate your Body Mass Index (BMI) instantly to understand if you are within a healthy weight range for your height.

text

Reading Level Checker

Analyze the readability of your text using Flesch-Kincaid and other standard metrics.

developer

Hex to RGB Converter

Convert hex color codes to RGB and HSL instantly. Perfect for designers and developers.

health

Ovulation Date Calculator

Identify your most fertile days and estimated ovulation date based on your cycle.

developerFeatured

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Support for seconds and milliseconds.

mathFeatured

Pace Calculator

Calculate your running pace, finish time, or distance. Works for marathons, 5ks, and more.

math

Aspect Ratio Calculator

Calculate dimensions while maintaining any aspect ratio. Useful for video, images, and layout.

text

Text Case Converter

Convert text to uppercase, lowercase, title case, or sentence case instantly.

developer

Password Strength Checker

Test your password against security standards to ensure it is hard to crack.

How it works

Built for speed and accuracy.

01

Find your tool

Search in plain English. "Convert PNG to JPG" or "How much chocolate is toxic for dogs" — we find the right tool.

02

Enter your data

Every tool uses the exact formula professionals use. We show you the formula so you understand the answer.

03

Get your result

Instant results, right in your browser. Download, copy, or share. No accounts, no watermarks, no limits.

From the blog

Understand the formulas

Short articles explaining how calculations actually work.

developer2026-05-03

Unix Timestamps Explained for Humans

4 min read
finance2026-05-02

The Freelance Rate Formula Explained

5 min read
health2026-05-01

How to Calculate Your Real Calorie Deficit

6 min read

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