UK Mortgage Planning

Know Your Monthly Mortgage Before You Commit

Enter your property price, deposit and interest rate — get your estimated monthly repayment, total interest and LTV ratio in seconds. No sign-up, no data stored.

🏠 Try Mortgage Calculator See All Tools
Example: £250,000 Home
Deposit (10%)£25,000
Loan Amount£225,000
Monthly Payment£1,327
Total Interest£173,000
2025/26 Tax Year

Calculate Your Take-Home Pay Instantly

Our UK income tax calculator includes Income Tax, National Insurance and your personal allowance. See exactly what lands in your bank account each month.

💷 Try Tax Calculator Salary Calculator →
Example: £45,000 Salary
Income Tax£6,486
National Insurance£2,584
Monthly Take-Home£2,994
Effective Rate20.2%
Compound Growth

See How Your Money Grows Over Time

Discover the power of compound interest. Enter your starting pot, monthly contributions and expected return to see your projected investment value in any future year.

📈 Try Investment Calculator ROI Calculator →
£10k + £300/month @ 7% — 20yrs
Total Contributed£82,000
Investment Growth£83,459
Future Value£165,459
Growth Multiple2.02×
Freelancers & Self-Employed

Price Your Work Correctly — Every Time

Most freelancers underprice themselves. Our rate calculator accounts for tax, holidays, non-billable time and expenses — so your rate actually covers everything you need.

💼 Try Rate Calculator VAT Calculator →
Example: £40k Target Income
Gross Required£57,143
Hourly Rate£37.45
Day Rate£299.60
Billable Hours/Year1,526h
UK VAT — Standard 20%

Add or Remove UK VAT in One Click

The fastest VAT tool in the UK. Works with standard (20%), reduced (5%) and custom rates. Instantly see the net amount, VAT amount and gross total for any figure.

🧾 Try VAT Calculator Profit Calculator →
VAT at 20% — Both Ways
Net (ex-VAT)£1,000
VAT Amount£200
Gross (inc-VAT)£1,200
Rate Applied20% Standard
✅ 100% Free — No Sign-Up
🔒 No Data Stored
⚡ Instant Results
📱 Works on All Devices
🇬🇧 Built for UK Users
10 Free Tools

All Finance Calculators

Choose a calculator and get your answer in seconds. Every tool is free, instant and requires no account.

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Why CalcWise UK?

Built to Beat the Competition

We analysed the top 20 UK finance calculator websites. Here is what they are missing — and what we built instead.

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Genuinely Instant Results

No page reloads, no waiting for servers. Every calculation runs directly in your browser for results in under a second.

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UK-Specific by Default

Pre-loaded with the correct 2025/26 personal allowance (£12,570), current NICs bands, and 20% VAT rate. No manual adjustment needed.

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Mobile-First Design

Most competitors have poor mobile layouts. Every CalcWise tool is designed for thumbs first — fast and clear on any screen size.

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Plain-English Explanations

Every tool includes a full explanation of what the inputs mean, how the result is calculated, and worked examples you can follow step by step.

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Smart Related Tools

Every page links to the two or three calculators you are most likely to need next — reducing the effort of researching connected figures.

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Zero Data Collection

We never store the numbers you enter. All calculations happen inside your browser only. No account, no tracking of your financial data.

How It Works

Four Steps to Your Answer

No complicated process. Use any of our tools in under a minute.

1️⃣

Choose Your Tool

Pick from ten UK finance calculators covering mortgages, tax, VAT, salary and more.

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Enter Your Numbers

Type in the figures that apply to your situation. Every field includes a clear label and example value.

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Get Instant Results

Hit Calculate and see your full breakdown immediately — monthly figures, totals and percentages all at once.

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Read the Explanation

Each tool page explains what the result means and when to seek professional advice for your specific situation.

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Complete Guide

What Every Tool Does — In Plain English

A full explanation of each calculator, who it is designed for, and exactly how to use it.

🏠 Mortgage Calculator

The mortgage calculator is one of the most-searched financial tools in the UK. It helps anyone planning a property purchase understand their potential monthly commitment before speaking to a lender or broker. You enter the property price, your deposit amount, the expected annual interest rate, and how many years you want the mortgage to run.

The tool calculates your monthly repayment using the standard amortisation formula, then shows you the total interest you will pay over the full term, the total amount repaid, and your loan-to-value (LTV) ratio — which lenders use to determine the rates you can access. A lower LTV typically unlocks better rates, so this figure is worth understanding early.

💡 Who should use this

First-time buyers comparing affordability, homeowners approaching remortgage, or anyone wanting to compare different deposit sizes, term lengths or rates side by side.

💰 UK Income Tax Calculator

This is the tool most people search for when comparing job offers, planning salary negotiations, or simply checking why their payslip looks different from what they expected. The calculator uses the 2025/26 personal allowance of £12,570 and the standard Income Tax bands — 20% basic rate up to £50,270, 40% higher rate up to £125,140, and 45% additional rate above that.

Crucially, the tool also estimates your National Insurance Contributions (NICs), which many competitors leave out. This gives a more realistic take-home figure than Income Tax alone. The effective tax rate figure shows what percentage of your gross pay you actually lose to HMRC, which is more useful than knowing the marginal rate alone.

💡 Who should use this

Employees comparing job offers, freelancers estimating self-assessment bills, or anyone who wants to understand how a pay rise will actually change their monthly income.

🧾 UK VAT Calculator

VAT (Value Added Tax) is charged at 20% on most UK goods and services, 5% on some domestic energy and home improvements, and 0% on items like food, children's clothing and books. The question most people ask is either "how much VAT is on this price?" or "what should the price be once I add VAT?" — and this tool answers both.

Select whether to add VAT to a net price or remove it from a gross price. Enter the amount. Choose your rate. The tool instantly shows the net figure, the VAT amount and the gross figure. This is essential for businesses raising invoices, freelancers setting day rates, and anyone checking receipts or purchase orders.

💡 Who should use this

Business owners, freelancers, accountants, online sellers, or anyone dealing with invoices, quotes or import pricing that includes UK VAT.

💷 UK Salary Calculator

Many people are paid annually but manage their money weekly or monthly. This tool converts a gross annual salary into all four useful time periods: monthly, weekly, daily and hourly. The hourly rate is calculated based on your stated working hours per week, which you can adjust for part-time roles.

This calculator is particularly useful when comparing a salaried offer against a contractor or freelance rate. For example, if a job offers £45,000 per year and you work 40 hours a week, the true hourly equivalent is around £21.63 — allowing a like-for-like comparison with an hourly contract rate that includes holidays and sick pay in the context of the full package.

💡 Who should use this

Job seekers comparing offers, employees moving from hourly to salaried work, managers setting budgets, or freelancers benchmarking their rates against employment income.

🏦 Loan Calculator

This tool calculates the cost of any fixed-term loan using the standard amortisation formula. Enter the loan amount, annual interest rate and repayment term in months. The result shows you the monthly payment, total interest charged across the full term, and the total cost of borrowing.

This is useful for personal loans, car finance, consolidation loans and credit facilities. By adjusting the term, you can immediately see the trade-off between a lower monthly payment (longer term) and less total interest (shorter term). Many people underestimate total interest — seeing the full figure is often a valuable moment of clarity before committing to a loan agreement.

💡 Who should use this

Anyone comparing loan offers, checking affordability before applying, or deciding between different loan terms and their long-term impact on total cost.

📈 Investment Calculator

This tool models compound investment growth over any time period. Enter a starting amount (your initial lump sum), a monthly contribution, an expected annual return percentage, and the number of years you plan to invest. The result shows your projected future value, how much of that comes from contributions versus growth, and the growth multiple achieved.

The power of this calculator is showing the difference that starting early makes. A 20-year investment at 7% can produce a growth multiple of over 2× — meaning every pound you put in becomes more than two pounds. Adjusting the monthly contribution up or down by small amounts produces surprising differences over a 20 or 30-year period.

💡 Who should use this

Anyone saving for retirement, building an ISA, comparing savings rates, or trying to understand how much regular monthly saving can accumulate over time.

💼 Freelance Rate Calculator

This is the most underused tool among self-employed people — and arguably the most important one. The key insight: your day rate is not simply your target salary divided by working days. You must factor in days not worked (holidays, sick days), time spent on non-billable activities like admin and pitching (typically 20–30% of your week), business expenses, and your income tax provision.

Enter your desired take-home income, your annual business expenses, the tax percentage you expect to owe, your billable hours per week, and how many weeks of holiday you take. The tool calculates the gross income you need to generate, then divides it by your true billable hours to give a minimum hourly rate. Below this figure, you are effectively losing money.

💡 Who should use this

Freelancers, contractors, consultants and self-employed sole traders setting prices for clients — especially those moving from employment into self-employment for the first time.

📊 Business Profit Calculator

Profit and revenue are not the same thing — a common source of confusion for early-stage business owners. This tool calculates both gross profit (revenue minus cost of goods sold) and net profit (gross profit minus all other operating expenses), and expresses both as a margin percentage.

Gross margin tells you how efficiently you produce and sell your product or service. Net margin tells you how much of each pound of revenue you actually keep after all costs. Both figures are vital for pricing decisions, investor conversations, and understanding whether your business model is fundamentally viable or whether costs need to be restructured.

💡 Who should use this

Small business owners, sole traders and startup founders who want to understand their true profitability, not just their turnover. Also useful for evaluating new product lines or service offerings before launch.

🎯 ROI Calculator

Return on Investment (ROI) is the single most important metric for evaluating whether spending money was worthwhile. This tool takes the simplest definition: net profit divided by total investment cost, expressed as a percentage. Enter what you spent and what you got back, and the tool shows profit, ROI percentage, and (optionally) annualised ROI if you specify the time period.

ROI is most commonly used for marketing campaigns (spend £1,000 on ads, generate £3,200 in sales, ROI = 220%), equipment purchases, business systems, and property improvements. It is not a perfect metric — it ignores time and risk — but as a quick comparison tool between different spending options, it is invaluable.

💡 Who should use this

Business owners evaluating marketing spend, managers justifying equipment purchases, property investors assessing renovation value, or anyone making a discretionary business investment and wanting a quick benchmark.

🛡️ Insurance Calculator

This tool provides an illustrative estimate of monthly insurance premiums for life cover, critical illness cover and income protection. It uses your cover amount, age, health status and cover type to apply standard actuarial weighting factors. The result is not a real insurance quote — insurers use detailed medical underwriting — but it gives a useful order-of-magnitude figure before you seek a formal quote.

Understanding how age affects premiums is one of the most important insights this tool provides. Life insurance premiums can double or treble between age 30 and age 50 for the same level of cover. Starting a policy earlier locks in lower rates, a consideration many people overlook until it becomes significantly more expensive.

💡 Who should use this

People planning financial protection for their family, self-employed workers without employer sick pay (who need income protection), or anyone comparing the approximate relative cost of different cover types and amounts before seeking broker advice.

Competitor Analysis

What We Cover That Others Don't

We analysed the top 20 UK finance calculator websites and identified 10 critical gaps. Every single one is fixed in CalcWise UK.

20
Competitor sites analysed
10
Critical gaps found
10
Gaps we fixed
100%
Free — no sign-up ever
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✅ Fixed

National Insurance Missing From Tax Results

❌ Competitors: Show Income Tax only — the take-home figure is significantly overstated because NI contributions are ignored entirely.

✅ CalcWise UK: Full Class 1 NIC calculation included alongside Income Tax, giving you a realistic monthly take-home figure for 2025/26.

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✅ Fixed

Mortgage Tools Don't Show LTV Ratio

❌ Competitors: Only show monthly payment and total interest — missing the loan-to-value ratio that determines which mortgage rates you can actually access.

✅ CalcWise UK: LTV ratio displayed in every mortgage result alongside payment, total interest and total repayment.

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✅ Fixed

Freelance Rate Tools Ignore Non-Billable Time

❌ Competitors: Simply divide target income by working days — ignoring the 20–30% of every week spent on admin, pitching and non-paid activities. The result causes serious undercharging.

✅ CalcWise UK: Dedicated non-billable time percentage field ensures your rate accounts for every unpaid hour in your working week.

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✅ Fixed

VAT Calculators Only Add — Never Remove

❌ Competitors: Most VAT tools only add VAT to a net price. Removing VAT from a gross figure — equally common on invoices and receipts — is not supported.

✅ CalcWise UK: Full bidirectional VAT — add to net or remove from gross — with standard (20%), reduced (5%) and custom rates in one tool.

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✅ Fixed

Investment Calculators Ignore Monthly Contributions

❌ Competitors: Calculate compound growth on a one-off lump sum only — making them useless for anyone saving regularly through an ISA, pension or savings account.

✅ CalcWise UK: Enter both a starting lump sum and a monthly contribution to see the realistic compound growth of a regular saving strategy over any time horizon.

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✅ Fixed

Profit Calculators Show Only One Margin

❌ Competitors: Return a single profit figure or basic net margin — missing the crucial distinction between gross profit margin and net profit margin that drives real business decisions.

✅ CalcWise UK: Both gross margin and net margin displayed alongside gross profit, net profit and total costs in a single clear result.

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✅ Fixed

ROI Tools Have No Time Dimension

❌ Competitors: Show a single ROI percentage with no ability to compare investments across different time periods — making it impossible to compare a 6-month campaign against a 3-year equipment purchase fairly.

✅ CalcWise UK: Custom time period field produces both total ROI and annualised ROI for accurate cross-investment comparison.

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✅ Fixed

Most Sites Store or Transmit Your Financial Data

❌ Competitors: Many calculator sites log inputs server-side, require registration, or pass data through tracking systems — giving away sensitive financial figures to third parties.

✅ CalcWise UK: Every calculation runs entirely inside your browser. Zero data is transmitted to any server. No account. No tracking of financial inputs. Ever.

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✅ Fixed

Poor Mobile Experience on Most Competitor Sites

❌ Competitors: Tables overflow, inputs are too small to tap, results are cut off, and layouts break on phones — yet over 60% of UK finance searches now happen on mobile devices.

✅ CalcWise UK: Designed mobile-first from the ground up. Every calculator, result and guide is fully usable on any phone or tablet with no zoom or horizontal scrolling needed.

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✅ Fixed

No Plain-English Explanation of Results

❌ Competitors: Display a result with no context — users see a number but don't understand what it means, what to do next, or when to get professional help. High bounce rates result.

✅ CalcWise UK: Every tool page includes a full in-depth guide, worked example, 6 real FAQs and clear signposting to professional resources — all in plain English.

Ready to try the better calculators?

All 10 tools are free, instant and require no sign-up. Start with the one you need most right now.

Browse All Tools 🏠 Mortgage Calculator 💰 Tax Calculator
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