Blog
Practical guides on pricing, calculators, and putting interactive tools to work on your website.
How to calculate a discount (and why stacked ones don't add up)
Percent-off math is simple until a second discount is stacked on top. Here are the formulas for a single discount, a final price, and the combined saving — plus the trap that catches most shoppers.
October 18, 2026How to calculate your break-even point
Break-even is the number of sales that covers your costs and nothing more. Here is the formula, what counts as fixed versus variable cost, and the levers that move it.
October 18, 2026ROI vs ROAS: how to calculate both
ROI and ROAS measure different things, and confusing them makes unprofitable campaigns look like winners. Here are both formulas, a worked example, and why ROAS alone misleads.
October 18, 2026How to add or remove VAT from a price
VAT is easy to add and easy to get wrong in the other direction. Here are the two formulas — exclusive and inclusive — and how VAT differs from GST and sales tax.
October 18, 2026How to calculate your exact age (in years, months, and days)
Your age is not just a number of years. Here's how to work out your exact age in years, months, and days — and why the odd-looking math actually matters.
October 18, 2026Hourly, project, retainer or value-based: how to choose a pricing model
The model you pick decides how much you earn for the same work. Here are the four ways to charge, when each one fits, and the trap hiding inside the hourly rate.
October 18, 2026Loan EMI: how much will you actually pay?
The headline interest rate tells you almost nothing about what a loan costs. Here is how EMI is calculated — and the two numbers that decide whether you are getting a good deal.
October 18, 2026The money math guide: loans, investments, tax, and pay
Four calculations decide most of your money — what a loan costs, what a SIP earns, how much tax sits on a price, and what your salary is worth per hour. Here is each one, the formula behind it, and the tool to run it.
October 18, 2026Which calculator do you need? Start from the question
Nobody wants a calculator — they want an answer. Here is how to find the right tool by starting from the question you are actually trying to answer.
October 18, 2026How to embed the Ask AI widget and let visitors ask AI about your business
The Ask AI widget puts ChatGPT, Claude, Perplexity, and Grok buttons on your website. Visitors click one and the assistant opens with a ready-made question about your business — and it detects your business automatically from your domain.
August 18, 2026How to embed a Plainso calculator and customise it to match your site
Copy the snippet, paste it anywhere, and control theme, size, and appearance — a practical guide to making embedded calculators feel native to your website.
August 17, 2026Best calculators to embed on a service business website
A rate estimator, a quote tool, an ROI calculator. The businesses that embed the right calculator answer the question their visitors came with — and turn a static page into a conversation.
August 16, 2026How to calculate percentages (with the three formulas)
Percentages run on three formulas — percent of a number, percentage change, and what percent A is of B. Learn them once and you can price discounts, read margins, and check any claim in seconds.
August 16, 2026How to calculate profit margin (with formulas and examples)
Margin and markup are not the same thing, and mixing them up costs you real money. Here's how to calculate both, what a healthy margin looks like, and the fastest way to improve yours.
August 16, 2026How to convert salary to hourly rate (with the formula)
Salary and hourly rates look like the same number in different units. They are not — paid leave, unpaid weeks, and benefits all change what an hour is actually worth. Here's the honest conversion.
August 16, 2026SIP calculator: how much to invest monthly to reach your goal
The number that matters is not the return, it's the monthly amount. Here's how SIP compounding actually works, what it takes to reach ₹1 crore, and how to check your own plan in seconds.
August 16, 2026GST and EMI calculators every Indian business needs
From GST invoices to loan EMIs, these four calculations decide real money every single week. Get them right with tools built for Indian numbers.
August 10, 2026How to price your freelance services in India
Stop guessing your rates. A simple income-target method that tells you exactly what to charge per hour, per project, and per month.
August 1, 2026Put a calculator on your website to generate leads
Visitors don't email you because your site looks nice. They email you because you helped them answer a question. A calculator does that 24/7.
July 15, 2026The calculator SEO play: own the questions people search
People don't search for 'widgets'. They search for 'how much should I charge' and 'what is my EMI'. Calculators are the best pages to answer those searches.
July 5, 2026How to calculate your startup runway (and what to do about it)
Runway isn't a number to check once a quarter. It's the single most honest metric your startup has. Here's how to read it — and what to do when it's short.
June 20, 2026