This calculator turns your take-home pay into a simple per-pay budget that matches the way money actually arrives, whether you are paid weekly, fortnightly or monthly. Instead of budgeting from a monthly total that does not line up with your paydays, you enter your take-home pay per pay, choose your pay cycle, add up your fixed annual bills (rent or mortgage, insurance, power, phone and the like), and set the share of what is left that you want to save. The calculator converts your annual bills to the same cycle as your pay, subtracts that amount first, then works out your chosen savings share of the remainder. It returns four figures: how much to set aside for bills each pay, how much to save each pay, what that adds up to over a year, and the amount left over to spend, shown as the headline result. Use it to work out exactly what to transfer into a separate bills account on payday, so a bill that falls monthly never catches you out on a fortnightly or weekly income. It is especially useful if your pay cycle and bill due dates never quite line up. The figures are only as accurate as what you enter, so review your bills list occasionally and treat the results as a budgeting guide rather than an exact forecast.
Converts annual fixed bills to your pay cycle, sets aside that amount plus your chosen savings share, and shows what is left to spend. Keep the bills money in a separate account. Estimate only.
The calculator converts your annual fixed bills to a per-pay amount based on your cycle, subtracts that from your take-home pay, then sets aside your chosen savings share of what remains. What is left is your free spending for the pay. Putting bills on the same cycle as your pay, in a separate account, is the simplest way to never come up short before payday.
On $1,800 a fortnight with $26,000 of annual bills, the bills cost $1,000 a pay, leaving $800. Saving 20% of that puts $160 a pay aside (about $4,160 a year) and leaves $640 to spend each fortnight.
If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.
Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.
Calculate.co.nz is the sister site of CalculatorHub.com, the world's largest calculator website by tool count.
All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.
Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.
Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.
Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.
All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.
About & trust: Why Calculate is NZ's most comprehensive · By the Numbers · How we compare · Editorial standards · How we keep data current · NZ finance glossary · Research & data · Financial literacy NZ · About · Privacy policy · Terms of use
Reviewed and maintained. Last reviewed 2026-07-02 and checked on a twice-monthly cycle against IRD, RBNZ and Stats NZ. How we keep data current.
© 2026 Calculate.co.nz. All rights reserved. Building free NZ calculators since 2011.