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Priostack Apps

Free calculators and tools

Loans, property, tax, pay, ecommerce, marketing and logistics: free, with no sign-up, and the sums are done in your browser.

Featured

Loans and credit

Repayments, rates, mortgages and every kind of loan.

Mortgages

  • Mortgage calculator

    Work out your monthly mortgage payment, repayment or interest-only, the total interest, a yearly schedule and your loan to income. Rounded to the penny.

  • Remortgage calculator

    Compare your mortgage with a new deal: new monthly payment, early repayment charge, fees, net saving and the month the switch pays for itself.

  • Early repayment calculator

    See the interest you save by overpaying or paying off a mortgage or personal loan early, your new term or payment, and the early repayment charge.

  • Debt-to-income calculator

    Work out your debt-to-income ratio, monthly debt payments ÷ gross monthly income. Compare it with a lender’s limit and check a mortgage’s income multiple.

Repayments and rates

  • Loan repayment calculator

    Work out the monthly repayment on a loan from the amount, the APR or interest rate and the term, with the total interest, the total repaid and every step.

  • Loan amortisation calculator

    See every payment of a loan split into interest and capital, with the balance owed after each one, by month or by year. Export the schedule as CSV.

  • APR calculator

    Work out the APR of a loan from its interest rate or monthly payment, with arrangement fees and compulsory insurance, rounded as the UK rules require.

  • Interest rate calculator

    Find the interest rate of a loan from the amount, the monthly repayment and the term: nominal rate, annual equivalent rate and APR, with the workings.

Car, personal and other loans

  • Personal loan calculator

    Work out the monthly payment, total interest, total cost and APR of a fixed-rate personal loan, with a year-by-year breakdown of what you repay.

  • Car finance calculator

    Work out the monthly payment, total cost and APR of a car loan or hire purchase deal from an APR, nominal or flat rate, with the HP half-way figure.

  • Balloon payment calculator

    Work out the monthly payment on a loan or PCP with a balloon, its cost and APR, the payment with no balloon, and the hire purchase half-way point.

  • Credit card repayment calculator

    Work out how long your credit card balance takes to clear, what to pay to clear it in time, and what paying only the minimum costs you in interest.

  • Student loan repayment calculator

    See what Plan 1, 2, 4, 5 and Postgraduate Loans take from your pay in 2026/27, each month, week or year, with the interest rates charged now.

  • Business loan calculator

    Monthly or quarterly business loan repayments at a fixed rate or Bank Rate plus a margin, with fees and a repayment holiday: total cost and effective rate.

Property

Buying a home, paying rent, and property as an investment.

Buying a home

  • Mortgage affordability calculator

    What you could borrow at an income multiple, and the highest price your deposit covers once Stamp Duty, LBTT or LTT is paid. With the workings.

  • Mortgage deposit calculator

    Work out your deposit as an amount or a share of the price, your mortgage and LTV band, the cash you need and the time to save it, Lifetime ISA included.

  • House buying costs calculator

    See what buying a home costs on top of the price: Stamp Duty, LBTT or LTT, the Land Registry fee and your own costs, in England, Scotland, Wales and NI.

  • French notaire fees calculator

    Work out French notaire fees on an existing home: the department’s transfer tax, the notaire’s regulated fee with VAT and the security contribution.

  • Stamp duty calculator

    Work out Stamp Duty Land Tax in England and Northern Ireland, LBTT in Scotland or LTT in Wales, for first-time buyers, second homes and non-residents.

  • Price per square metre calculator

    Work out the price per square metre and per square foot of a home, the price from a figure per m², or the floor area a budget buys, with workings.

Rent

  • Rent affordability calculator

    The most rent your income supports under the 30 times rent check or the ONS 30% benchmark, the income a rent needs, and the deposit cap where you live.

  • Rent increase calculator

    Work out a new rent from a percentage, or the percentage from a new rent, per payment and per year, with the notice rules in each UK nation.

Buy-to-let and investment

  • Rental yield calculator

    Work out the gross and net yield of a buy-to-let after empty months, agent’s fees and running costs, with an estimate after Income Tax for 2026 to 2027.

  • Rental cash flow calculator

    Monthly cash flow of a buy-to-let: rent, voids, agent’s fees, mortgage and Income Tax on the rental profit, with mortgage interest relief and workings.

  • Property ROI calculator

    Work out the return on a buy-to-let: Stamp Duty, LBTT or LTT at the higher rates, the mortgage, cash flow, the sale, total ROI and IRR, before tax.

  • Property appreciation calculator

    Project what a home could be worth at the UK House Price Index trend or your own rate, or measure how much it has grown since you bought it.

  • Vacancy rate calculator

    Work out the vacancy and occupancy rate of a let from time empty, empty units or rent lost, see the rent lost, and check the empty homes premium.

  • Property management fee calculator

    Work out what your letting agent costs in a year: management fees with and without VAT, tenant-find fee and rent guarantee insurance, every step shown.

Tax and VAT

VAT, Income Tax, gains, and the taxes a business pays.

VAT and customs

  • VAT calculator

    Add VAT to a net price or take it out of a gross price at the UK standard, reduced or zero rate, or any rate. Rounded to the penny, with workings.

  • Customs duty calculator

    Work out Customs Duty and import VAT on goods bought abroad or sent as a gift to Great Britain: the £135 and £39 limits, tariff rate and full workings.

Personal tax

  • Income Tax calculator

    Work out your Income Tax for 2026 to 2027 in England, Wales, Northern Ireland or Scotland, with the Personal Allowance taper above £100,000.

  • Withholding tax calculator

    Work out UK tax deducted at source: CIS at 20% or 30% after materials, 20% on interest and royalties, and rent to a landlord abroad. Net to gross too.

  • Capital Gains Tax calculator

    Work out Capital Gains Tax on property, shares or other assets for 2026 to 2027: the 18% and 24% rates, the £3,000 allowance, losses and your income.

  • Dividend tax calculator

    Work out the tax on your dividends at UK rates: 10.75%, 35.75% and 39.35% for 2026/27, after the £500 dividend allowance, with every step shown.

  • Council tax calculator

    Work out your 2026/27 council tax from your band and your council’s Band D charge, with the single person discount, second home premium and instalments.

Business tax

  • Corporation Tax calculator

    Work out Corporation Tax on a company's profits at the 19% small profits rate, the 25% main rate or with Marginal Relief, with every step shown.

  • Employer NI calculator

    Employer National Insurance for 2026/27: 15% above £5,000 a year, under-21, apprentice and Freeport reliefs, the £10,500 Employment Allowance and the levy.

  • Self-employed tax calculator

    Income Tax and Class 4 National Insurance on your sole trader profit for 2026 to 2027, with Scottish rates, the trading allowance and full workings.

Pay and employment

Gross to net, hourly pay, overtime, bonuses and holidays.

Salary

  • Salary calculator

    Work out take-home pay from your salary, or the salary you need for a take-home figure, after Income Tax, National Insurance and student loans for 2026/27.

  • Take-home pay calculator

    Work out your take-home pay for 2026/27: Income Tax (Scottish rates too), National Insurance, student loans and pension, by the year, month or week.

  • Hourly wage calculator

    Turn an hourly rate into daily, weekly, monthly and annual pay, or a salary into an hourly rate, and check it against the 2026 minimum wage.

  • Part-time salary calculator

    Work out your pro rata salary from the full-time salary and your weekly hours: yearly, monthly, weekly and hourly pay, checked against the minimum wage.

  • Pay rise calculator

    Work out a pay rise from a percentage, an amount or your new salary, per hour, week, month or year, and check it against inflation and the minimum wage.

Overtime, bonuses and commission

  • Overtime calculator

    Work out overtime pay at time and a half, double time or the rate in your contract, for a week or a month, and check it against the minimum wage.

  • Shift pay calculator

    Work out the gross pay for a shift with night, weekend and bank holiday premiums, split at midnight and checked against the minimum wage.

  • Bonus tax calculator

    See how much of your bonus you keep after Income Tax, National Insurance and student loan, for England, Wales, Northern Ireland or Scotland in 2026/27.

  • Sales commission calculator

    Work out sales commission at one rate or across bands and tiers, add basic pay and check the total against the UK minimum wage. Rounded to the penny.

Holidays and redundancy

  • Holiday pay calculator

    Work out holiday pay in Great Britain: a week’s pay, the 52-week average for variable pay, or rolled-up 12.07% for irregular hours. Workings shown.

  • Redundancy pay calculator

    Work out statutory redundancy pay from your age, full years of service and weekly pay, capped at £751 a week (£783 in Northern Ireland). Workings shown.

Savings and investing

Interest, savings goals, investment returns and retirement.

Savings and interest

  • Savings goal calculator

    Work out how much to save each month to reach a savings goal, or how long it will take, with or without interest. Rounded to the penny, with workings.

  • Emergency fund calculator

    Work out your emergency fund in months of take-home pay or essential spending, what is left to save and how many months it takes, with workings.

  • Compound interest calculator

    See what your savings grow to with compound interest: a lump sum, monthly or yearly deposits, interest added yearly, monthly or daily, and the AER.

  • Simple interest calculator

    Work out simple interest between two dates or over days, months or years, or find the principal, rate or time. Exact to the penny, with the workings.

  • Inflation calculator

    See what an amount from any year since 1988 is worth in another, using the ONS Consumer Prices Index, or project what prices will cost in future.

Investing

  • Investment return calculator

    Work out the gain, total return and annualised return on an investment, with regular contributions, dividends, withdrawals and inflation. Workings shown.

  • Dividend yield calculator

    Work out a share’s dividend yield from its price in pence or pounds, your yield on cost, the dividends your shares pay and your yield after tax.

  • Asset allocation calculator

    Enter each holding's value and target weight to see what to buy and sell to rebalance, or how to invest or withdraw while keeping your mix.

  • Currency gain calculator

    Work out the gain or loss in pounds on foreign currency or an overseas investment between two exchange rates, after fees, with the currency effect.

Retirement and net worth

  • Retirement savings calculator

    See the pot your savings could build by retirement, its value in today’s money, the monthly income it could pay and what to save for an income goal.

  • Financial independence calculator (FIRE)

    How big a pot do you need to live off your investments, and how many years will it take? Withdrawal rate, real return and monthly saving, all shown.

  • Net worth calculator

    Add up what you own and take away what you owe: total assets, total debts and net worth, split into property, savings, pensions and other assets.

Freelance and business

Day rates, invoices, cash runway and startup metrics.

Freelance rates

  • Freelance day rate calculator

    Work out the day rate that covers your target income, business costs, tax and National Insurance over the days you can really bill, bank holidays included.

  • Freelance hourly rate calculator

    Work out the minimum hourly rate to charge as a freelancer or self-employed person in the UK, covering your income, business costs and a tax set-aside.

  • Project cost calculator

    Cost a project line by line: person-days, purchases, overheads and contingency, then the price that gives the markup or margin you want.

Invoices and getting paid

  • Invoice and quote generator

    Create invoices and quotes to print as PDFs: VAT by rate, due dates, and a check of what UK invoices and VAT invoices must show.

  • Timesheet calculator

    Enter start, finish and break times by client to get hours per day, week and client, decimal hours, the amount to bill and a CSV for Excel.

  • Late payment interest calculator

    Work out statutory interest on a late business invoice: 8% plus the Bank of England base rate, plus the £40, £70 or £100 fixed sum. Workings shown.

Startup and SaaS metrics

  • Cash runway calculator

    Work out your cash runway: how many months your cash lasts at your net burn, when it runs out, and how much more you need to reach a target.

  • Burn rate calculator

    Work out your monthly gross and net burn from spending and income, or from two bank balances, and how many months your cash lasts at that rate.

  • MRR and ARR calculator

    Work out your ending MRR and ARR from new, expansion, contraction and churned MRR, with MRR growth, gross churn, net revenue retention and quick ratio.

  • Customer acquisition cost calculator

    Divide your marketing and sales costs by your new customers: CAC to the penny, payback period in months and LTV:CAC ratio, with every step shown.

  • Customer lifetime value calculator

    Work out customer lifetime value (LTV) from repeat orders or subscription churn, with gross margin, the LTV:CAC ratio and payback period. Workings shown.

Pricing and ecommerce

Margins, selling prices, discounts and online shop figures.

Prices and margins

  • Margin and markup calculator

    Enter any two of cost, price, profit, margin or markup and get the rest, including the price with VAT. Margin and markup explained, with workings.

  • Pricing calculator

    Work out a selling price from your costs and a target margin or markup, with fixed costs, UK VAT and price endings such as .99. Every step shown.

  • Break-even calculator

    Work out your break-even point in units and sales from fixed costs, price and variable costs, with contribution margin, margin of safety and workings.

  • Discount calculator

    Take a percentage or an amount off a price, find the percentage between two prices, stack two discounts or find the was price, to the penny.

  • Sale price calculator

    Work out a sale price from the original price and the percentage off, with an extra discount if there is one, or find the original price from a sale price.

Online shop figures

  • Average order value calculator

    Divide your revenue by your number of orders: average order value to the penny, net of refunds, with items per order and the gap to a target AOV.

  • Conversion rate calculator

    Divide conversions by visitors for your website conversion rate to two decimal places, with average order value, a target and the change in points.

  • Cart abandonment rate calculator

    Work out your cart abandonment rate from carts created and orders completed, the revenue left in abandoned carts and what reminder emails could win back.

  • Product return rate calculator

    Work out the share of your online sales that comes back, by number of items and by value, with the average refund and what the returns cost you.

Fees and delivery charges

  • Marketplace fee calculator

    Work out what a marketplace takes on a sale: commission, payment and fixed fees, VAT on the fees, your payout, profit and break-even price.

  • Free shipping threshold calculator

    Find the order value from which free delivery keeps your margin: the threshold, the break-even order and the extra spend it asks, with workings.

  • Delivery charge calculator

    Set your shop’s delivery charge from the carrier rate, packaging and packing time: pass it on, add a markup or offer free delivery, with UK VAT.

Marketing

Ad costs, click rates, ROAS and email campaigns.

Online advertising

  • CPC calculator

    Work out your cost per click (CPC) from cost and clicks, what a number of clicks will cost, the clicks a budget buys, and your break-even CPC.

  • CPM calculator

    Work out the CPM of a campaign from its cost and impressions, the cost of a media plan or the impressions a budget buys, with the CTR, CPC and working.

  • CTR calculator

    Divide clicks by impressions for the click-through rate of an ad, a Google result or a YouTube thumbnail, or work back to clicks or impressions from a CTR.

  • Cost per acquisition (CPA) calculator

    Divide your ad spend by your conversions for your cost per acquisition to the penny, then compare it with your break-even CPA and your target CPA.

  • ROAS calculator

    Work out your return on ad spend from spend and revenue, your break-even ROAS from your margin, and the budget or revenue for a target ROAS.

Email and leads

  • Email open rate calculator

    Work out your email open rate from unique opens and delivered emails, take out bounces and Apple Mail Privacy Protection opens, and compare two sends.

  • Email click rate calculator

    Work out an email campaign’s click rate from emails sent, bounces and unique clicks, with the click-to-open rate, open rate and clicks a target needs.

  • Lead conversion calculator

    Divide customers won by leads for your lead conversion rate, then see your close rate, cost per lead and the leads you need to hit a sales target.

Shipping and logistics

Parcels, freight, pallets, containers and stock.

Parcels and delivery

  • Parcel shipping cost calculator

    Work out what your carrier charges for parcels: volumetric weight, weight band, fuel surcharge and VAT, including Royal Mail's exemption. With workings.

  • Volumetric weight calculator

    Work out the volumetric weight (L × W × H ÷ divisor) and the chargeable weight of your parcels, with DHL Express UK rules or your own divisor.

  • Last-mile delivery cost calculator

    Work out your last-mile cost: driver, van and other costs per successful delivery, with the cost of failed attempts and the cost per mile.

  • Delivery time calculator

    Work out the dispatch and delivery dates of an order in working days, skipping weekends and UK bank holidays, with the 30-day legal limit.

Freight and loading

  • Freight calculator

    Work out the chargeable weight, actual or volumetric, and the cost of a road, air or sea freight shipment: rate, minimum charge, fuel and UK VAT.

  • CBM calculator

    Work out the CBM (cubic metres) of cartons and pallets from cm, mm, inches or feet, with cubic feet, total weight and your carrier's chargeable weight.

  • Container load calculator

    How many boxes fit in a 20ft, 40ft or high cube container by space and by weight, how many containers you need, and the VGM, with the workings.

  • Pallet calculator

    How many boxes fit on a pallet? Layers, height, weight, volume in m³ and the pallets an order needs, for Euro and 1200 × 1000 pallets, with workings.

Stock and warehouse

  • Reorder point calculator

    Work out your reorder point from average usage, supplier lead time and safety stock, or with the maximum usage method, and see if it is time to reorder.

  • Safety stock calculator

    Work out safety stock from your demand, lead time and service level, or from maximum and average figures, with the reorder point and every step shown.

  • EOQ calculator

    Work out the economic order quantity (EOQ) from yearly demand, order cost and holding cost, with orders a year, days between orders and the yearly cost.

  • Inventory turnover calculator

    Work out stock turnover and average days in stock for any period, by value or in units, from cost of goods sold or from purchases, with workings.

  • Warehouse capacity calculator

    Work out how many pallets fit in a warehouse from its floor area in sq ft or m², the pallet size and the levels, with utilisation, volume and workings.