Useful habit
- Run a base case.
- Change one uncertain assumption.
- Compare the difference, not just the headline result.
Run everyday business, finance, marketing, date and percentage calculations without building a spreadsheet first.
Calculators
The formula is only half the job. Units, dates, rates and assumptions decide whether the number answers the question you actually meant to ask.
Browse online calculators
Unix Timestamp Converter
Convert Unix timestamps to readable local and UTC dates.
Percentage Calculator
Calculate a percentage of any number.
Percentage Change Calculator
Calculate percentage increase or decrease between two values.
Discount Calculator
Calculate sale price and savings from a discount.
Profit Margin Calculator
Calculate gross profit and margin from revenue and cost.
GST Calculator
Add or extract GST from an amount using any rate.
Age Calculator
Calculate age from a date of birth to any target date.
Date Difference Calculator
Calculate the number of days and weeks between two dates.
Compound Interest Calculator
Estimate investment growth with compound interest.
VAT Calculator
Add or extract VAT at a custom percentage rate.
Markup Calculator
Calculate selling price and gross margin from cost and markup percentage.
Break-even Calculator
Calculate break-even units and revenue from fixed cost, price and variable cost.
ROAS Calculator
Calculate return on ad spend from advertising cost and attributed revenue.
CPC Calculator
Calculate average cost per click from spend and clicks.
CPM Calculator
Calculate cost per thousand impressions from spend and impressions.
CTR Calculator
Calculate click-through rate from clicks and impressions.
Conversion Rate Calculator
Calculate conversion rate from conversions and visits, clicks or leads.
Loan EMI Calculator
Estimate monthly loan payments from principal, annual rate and term.
SIP Calculator
Estimate the future value of regular monthly investments at an assumed return.
CAGR Calculator
Calculate compound annual growth rate from beginning value, ending value and years.
Simple Interest Calculator
Calculate simple interest from principal, annual rate and time.
ROI Calculator
Calculate return on investment from gain/value received and total cost.
Customer Acquisition Cost Calculator
Calculate CAC from acquisition spend and new customers.
Lead Conversion Calculator
Calculate lead-to-customer conversion rate and cost per converted customer.
The formula is the easy part; the inputs decide whether it is useful
A calculator can be mathematically correct and still support a bad decision. ROAS can look excellent while margins are poor. CAGR can hide a wild journey between two endpoints. An EMI estimate can differ from a lender schedule once fees or day-count rules appear.
Kaazo's calculators are meant for quick checks and scenarios. Enter numbers that use the same units and time periods, then challenge the assumption that matters most. One changed rate often teaches more than staring at a single answer.
Nothing here replaces tax, legal, lending or investment advice. The point is to make arithmetic fast enough that you can spend more time on the judgement around it.
Watch the denominator
- CTR, conversion rate, CAC and ROAS can all be misleading when teams define inputs differently.
Want the deeper reasoning? Read the practical guide for this category.