OneKitTools logoOneKitTools
finance2 min read

"Financial Calculators: Mortgage, Salary, Tax & Crypto Tools"

Free online financial calculators for mortgage payments, salary breakdown, tax estimates, crypto conversion, and budget planning.

OneKitTools TeamMarch 27, 2026

Financial Tools for Everyday Decisions

Whether you're buying a house, negotiating a salary, planning a budget, or converting crypto — having the right calculator at hand saves time and prevents costly mistakes.

Here's a guide to our most useful financial tools.

Mortgage Calculator

Our Mortgage Calculator gives you a complete breakdown:

  • Monthly payment based on loan amount, interest rate, and term
  • Amortization schedule showing principal vs interest over time
  • Total interest paid over the life of the loan
  • Early payoff scenarios — see how extra payments save you money

Example

LoanRateTermMonthly PaymentTotal Interest
€200,0003.5%25 years€1,001€100,360
€200,0003.5%20 years€1,160€78,356
€200,0003.5%15 years€1,430€57,358

Shortening your term by 5 years saves over €20,000 in interest.

Salary Calculator

The Salary Calculator converts between:

  • Gross to net — see your take-home pay after taxes and deductions
  • Annual ↔ Monthly ↔ Hourly — compare different salary formats
  • Employer cost — what you actually cost your company

Useful when negotiating a raise, comparing job offers, or switching from freelance to full-time.

Loan Calculator

Beyond mortgages, the Loan Calculator handles:

  • Personal loans
  • Car loans
  • Student loans
  • Any fixed-rate amortizing loan

Enter the amount, rate, and term — get your monthly payment instantly.

Crypto Converter

The Crypto Converter provides real-time conversions:

  • Bitcoin, Ethereum, and 50+ cryptocurrencies
  • Live prices from CoinGecko API
  • Convert between crypto and fiat (EUR, USD, GBP)
  • Historical price reference

Budget Planner

The Budget Planner helps you:

  • Track income vs expenses by category
  • Visualize spending with charts
  • Set savings goals
  • Identify areas to cut costs

Based on the 50/30/20 rule: 50% needs, 30% wants, 20% savings.

Expense Splitter

Going on a trip with friends? The Expense Splitter calculates:

  • Who paid what
  • Who owes whom
  • Minimum number of transfers to settle up
  • Support for unequal splits

All Financial Tools

ToolWhat It Does
Mortgage CalculatorMonthly payments + amortization
Salary CalculatorGross/net + hourly/monthly/annual
Loan CalculatorAny fixed-rate loan breakdown
Crypto ConverterReal-time crypto ↔ fiat rates
Budget PlannerIncome vs expenses tracking
Expense SplitterSplit bills with friends

All tools are free, require no signup, and work in your browser. Try the Mortgage Calculator to get started.

Share