We would love to hear from you. Whether you have a question about a tool, want to request a new calculator or have spotted a mistake, please get in touch.
Email us
Write to customboxespeakuk@gmail.com. We usually reply within two working days.
Reporting a mistake
Please include the tool’s page address, the numbers you entered and the result you expected. This helps us fix problems quickly.
Requesting a tool
Tell us what you need to calculate or convert and who would use it. Many of our tools were added because visitors asked for them.