Welcome back
Your calculator toolkit
Five focused tools for pricing sponsorships, quoting projects, and checking your margins — no spreadsheet required.
YouTube Sponsorship Rate Calculator
Estimate a fair brand deal rate from your average views.
Typical range: 10–30. Higher for finance/tech, lower for general vlogs.
Suggested rate
per sponsored video
Estimate only · negotiate with confidence
Freelance Project Quote Builder
Turn your hours and costs into a client-ready quote.
Project quote
Stripe / PayPal Fee Calculator
See exactly what you'll net after processor fees.
Payout summary
you'll actually receive
Estimate only · rates vary by country
ROAS Estimator
Check how efficiently your ad spend is converting to revenue.
ROAS
3D Printing Cost Estimator
Price your prints based on material and machine time.
Print cost
Tax Calculator
Work out how much to set aside from freelance or business income.
Rates vary by country — check your local tax authority for exact brackets.
Set aside
estimated tax owed
Estimate only · not tax advice
Invoice Generator
Type it in on the left, watch it build on the right, then download.
Your business
Bill to
Items
Profit Margin Calculator
Check your margin and markup before you list a product.
Margin
profit margin
Before ad spend & platform fees
Age Calculator
Find your exact age in years, months, and days.
Your age
BMI Calculator
Check your body mass index and healthy weight range.
Your BMI
General guideline · not medical advice
Percentage Calculator
Two common percentage questions, answered instantly.
Results
Discount Calculator
Work out the sale price and how much you save.
Final price
EMI Calculator
Monthly installment using the reducing-balance method.
Monthly EMI
Loan Calculator
Flat-rate estimate of total interest over the loan term.
Total repayment
Flat-rate estimate · differs from EMI's reducing balance
GST / VAT Calculator
Add tax to a price, or pull it out of a tax-inclusive price.
Total amount
Currency Converter
Live exchange rates, fetched when you convert.
Uses the free frankfurter.app exchange-rate API — needs an internet connection.
Converted amount
Unit Converter
Convert length, weight, or temperature.
Converted value
Password Generator
Create a strong, random password.
Generated password
QR Code Generator
Turn any link or text into a scannable QR code.
Generated using the free qrserver.com API — needs an internet connection.
Tip Calculator
Split the bill and tip fairly.
Per person
Fuel Cost Calculator
Estimate the fuel cost of a trip.
Trip cost
Salary Calculator
Break down an annual salary into monthly, weekly, and hourly figures.
Monthly
Commission Calculator
Work out commission earned on a sale.
Commission earned
About MicroTools Hub
MicroTools Hub is a free collection of everyday calculators built for creators, freelancers, and online sellers who need a quick answer without opening a spreadsheet.
Every tool runs entirely in your browser — nothing you type is sent to a server or stored anywhere, except where a tool (like the currency converter or QR generator) needs to call a public API to fetch live data.
Have an idea for a new calculator? Reach out on the Contact page — we're always adding more.
Contact us
Send us a message and it'll open in your email app, ready to send.
This opens your default email app — replace the address in the code with your own before publishing.
Privacy Policy
What we collect: Nothing by default. All calculations run locally in your browser and are never transmitted or stored.
Third-party requests: The Currency Converter calls the free frankfurter.app API, and the QR Code Generator calls the free qrserver.com API, purely to fetch the data you asked for. No personal data is sent with those requests.
Cookies & analytics: This template ships with none. If you add analytics or ads later, update this section to disclose what's collected.
Contact: Questions about this policy can be sent via the Contact page.
This is placeholder text — have a lawyer review it before using it for a real business.
Terms of Service
By using MicroTools Hub, you agree that all calculators are provided "as is" for general informational purposes, with no guarantee of accuracy for any specific financial, medical, legal, or tax decision.
You are responsible for verifying any result before relying on it — especially for tax, loan, or medical-related tools.
We may update or remove tools at any time without notice. Continued use of the site means you accept the current version of these terms.
This is placeholder text — have a lawyer review it before using it for a real business.
Disclaimer
The calculators on this site (including Tax, EMI, Loan, BMI, and GST/VAT) provide estimates only. They are not a substitute for advice from a qualified accountant, financial advisor, doctor, or tax authority.
Tax rates, loan terms, and health guidelines vary by country and change over time — always confirm exact figures with an official source before making a decision.
Frequently asked questions
Is MicroTools Hub free to use?
Yes — every calculator is free, with no sign-up required.
Do you store my data?
No. Calculations happen entirely in your browser and nothing is saved once you close or refresh the page.
Can I use this offline?
Most calculators work fully offline once the page has loaded. The Currency Converter and QR Code Generator need an internet connection since they call external APIs.
Are the tax and loan figures accurate for my country?
They're general-purpose estimates. Rates and rules vary by country, so always double-check with a local professional or authority before relying on them.
Can I request a new calculator?
Definitely — use the Contact page to send a suggestion.